Multi-wavelength laser frequency multiplication device and multi-wavelength spatial laser modulation device

Abstract

The application belongs to the technical field of laser application, and discloses a multi-wavelength laser frequency multiplication device and a multi-wavelength spatial laser modulation device. The multi-wavelength laser frequency multiplication device comprises a base A and one or more laser frequency multiplication units. Two rows of first mounting grooves are arranged on the two sides of the base A in parallel along the length direction of the base A. Each row of the first mounting grooves comprises two or more coaxially arranged clamping grooves A, and the clamping grooves A on the two rows of the first mounting grooves are symmetrically arranged. The laser frequency multiplication unit is mounted in the symmetrically arranged clamping grooves A of the two rows of the first mounting grooves. Each laser frequency multiplication unit corresponds to laser of one wavelength, and performs frequency multiplication processing on the laser of the corresponding wavelength. The multi-wavelength spatial laser modulation device comprises a fundamental frequency laser, a selective frequency multiplication mechanism provided with the multi-wavelength laser frequency multiplication device, and a laser shaping and amplifying mechanism. The application has the characteristics of simple structure and strong expansibility, and is suitable for use in a spatial laser application system to synchronously modulate the multi-wavelength laser frequency, waveform and power.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of laser application, and relates to laser modulation technology, in particular to a multi-wavelength laser frequency multiplication device and a multi-wavelength spatial laser modulation device. BACKGROUND

[0002] Multi-wavelength laser refers to the simultaneous generation or combination of multiple different wavelength laser outputs, which breaks through the traditional single wavelength limitation. Multi-wavelength laser has the advantages of wide wavelength adjustment range, enhanced optical power output, reduced system complexity, improved work efficiency and cost-effectiveness, strong adaptability, etc. It has been continuously applied in multiple application fields. In the field of communication, multi-wavelength laser can support more channels and provide greater data transmission capacity. In the field of environmental monitoring, multi-wavelength laser can perform more accurate pollutant detection. In the fields of material science and life science, multi-wavelength laser can perform multi-dimensional analysis, which helps to reveal more complex physical and chemical phenomena, etc. Therefore, multi-wavelength laser will be one of the important directions of future laser technology development.

[0003] Laser frequency multiplication is one of the key technologies for multi-wavelength laser modulation. In the traditional solid and gas laser field, laser frequency multiplication can usually only be performed on single wavelength laser, and multi-wavelength laser is usually difficult to be processed by the same system. The usual method is to perform frequency multiplication, amplification and shaping on single wavelength laser, and then perform laser beam combination processing on single wavelength laser. The disadvantage of this is that each single wavelength laser itself has an independent optical path structure, plus the subsequent multi-source laser beam combination optical path structure, resulting in a relatively complex and large multi-wavelength laser optical path structure, a large number of components, high cost, and is not conducive to subsequent system application.

[0004] In addition, laser shaping and gain amplification are also key technologies for realizing multi-wavelength laser adjustment. Similarly, like the existing laser frequency multiplication technology, the current laser shaping and gain amplification are also mainly for single wavelength laser. There is currently no multi-wavelength laser modulation technology for simultaneously performing frequency multiplication, shaping and amplification on multi-wavelength laser.

[0005] The patent application document with application number CN202411226366.0 discloses a multi-wavelength output laser and its implementation method, which uses a fundamental frequency laser to output a fundamental frequency laser with a wavelength of the fundamental frequency wavelength, and realizes the output of multiple wavelengths through the combination of the second wavelength module and the third module; and uses a lens to modulate the divergence angle of the second wavelength and the third wavelength laser, so that the directivity and divergence angle of the output lasers of different wavelengths are the same, thereby ensuring that the light of different wavelengths acts on the application terminal at the same position and has the same focusing performance after entering the light guide arm. It can be seen from this that in this implementation scheme, it is necessary to set a corresponding number of implementation modules according to the number of output laser wavelengths, such as a fundamental frequency laser, a second wavelength module, and a third wavelength module. It can be foreseen that when faced with the output of more than three wavelengths of laser light, its implementation structure will be quite complicated and difficult to meet application requirements. Summary of the Invention

[0006] The purpose of the present invention is to address the deficiencies in the above-mentioned prior art and provide a multi-wavelength laser frequency doubling device, which is designed for the first time as a multi-layer frequency doubling structure, capable of simultaneously realizing frequency doubling processing of multiple wavelength lasers, thereby improving the problems of design redundancy and limited application of traditional laser frequency doubling methods.

[0007] Another object of the present invention is to provide a multi-wavelength spatial laser adjustment device, which is based on the designed multi-wavelength laser frequency doubling device and further integrates a multi-wavelength shaping device and a multi-wavelength gain device to achieve simultaneous frequency doubling, shaping, and amplification of multi-wavelength lasers, thereby improving the problems of redundant multi-wavelength laser modulation structure and limited application in traditional laser applications.

[0008] In order to achieve the above objectives, the present invention adopts the following technical solutions to achieve them.

[0009] The present invention provides a multi-wavelength laser frequency doubling device, which includes a base A and one or more laser frequency doubling units; two rows of first mounting grooves are provided on both sides of the base A and are parallel along the length direction of the base A, each row of first mounting grooves includes two or more coaxially arranged card grooves A, and the card grooves A on the two rows of first mounting grooves are symmetrically arranged; the laser frequency doubling units are installed in the card grooves A symmetrically arranged in the two rows of first mounting grooves; each laser frequency doubling unit corresponds to a wavelength of laser light and is used to perform frequency doubling processing on the laser light of the corresponding wavelength.

[0010] Laser frequency doubling is a nonlinear optical process that doubles the frequency of a laser, thereby halving its wavelength. When a fundamental laser with a frequency of ω passes through a nonlinear crystal such as BBO, LBO, or CLBO, second harmonic generation (SHG) occurs, generating a laser with a frequency of 2ω, i.e., a frequency-doubled laser. For example:

[0011] (1) The 1064nm laser output by the Nd:YAG laser can be converted to 532nm laser after passing through a KTP crystal. Sometimes, it can also be further processed through an LBO crystal or a CLBO crystal for third or fourth harmonic generation to produce 355nm or 266nm ultraviolet light.

[0012] (2) The 770nm potassium (K) laser, 795nm rubidium (Rb) laser and 895nm cesium (Cs) laser output by the Ti:Sapphire tunable laser can be passed through BBO crystals (β-barium borate) or LBO crystals (lithium triborate) with different crystal orientations to obtain their doubled frequency 385nm, 398nm and 448nm lasers.

[0013] In one implementation, for multi-wavelength lasers, effective frequency doubling of lasers of different wavelengths and powers requires different laser frequency doubling unit thicknesses. Too small a thickness results in inadequate frequency doubling; too large a thickness results in significant laser power attenuation. To ensure effective frequency doubling of lasers of varying wavelengths and effectively control the impact of power attenuation, comprehensive calculations have been performed to ensure that all laser frequency doubling units have the same width and height perpendicular to the length of base A, ranging from 3-4 cm in width and 1-2 cm in height. The length along the length of base A is 1.5-3.5 cm. Each laser frequency doubling unit can transmit lasers with wavelengths ranging from 280 nm to 2 μm. However, each laser frequency doubling unit frequency-doubles only one wavelength and, aside from a certain power loss, does not perform frequency conversion, wavelength shift, or gain amplification for lasers of non-corresponding frequency doubling wavelengths. The laser frequency doubling unit can be a frequency doubling crystal block or a transparent, sealed cell filled with a frequency doubling medium. The frequency doubling medium can be a coumarin dye.

[0014] In one achievable embodiment, the first mounting slot provided by the present invention includes 10 slots A, which can fix 1 to 10 laser frequency doubling units.

[0015] The first mounting groove and the base A can be fixedly connected or slidably connected; when it is a sliding connection, laser frequency doubling units of different lengths can be installed, thereby meeting different laser frequency doubling requirements and expanding the application field of multi-wavelength laser frequency doubling devices.

[0016] In embodiment (1), the first mounting slot is composed of baffles A installed at both ends of base A perpendicular to the length of base A, and one or more partitions A located between the two baffles A. A slot A is formed between adjacent baffles A and partitions A, or between two adjacent partitions A. The baffles A and partitions A are designed to minimize the air layer between them and the laser frequency doubling unit. The baffles A and partitions A are respectively fixedly connected to base A. The heights of the baffles A and partitions A are the same or different. Furthermore, the heights of the baffles A and partitions A are not less than half the height of the laser frequency doubling unit and not more than 1.5 times the height of the laser frequency doubling unit.

[0017] In embodiment (2), the first mounting slot is composed of baffles A' mounted perpendicularly to the length of base A at both ends, and one or more partitions A' located between the two baffles A'. A slot A is formed between adjacent baffles A' and partitions A', or between two adjacent partitions A'. The baffles A' are fixedly or slidably connected to base A, and the partitions A' are slidably connected to base A. The heights of the baffles A' and partitions A' above base A are the same or different. Furthermore, the heights of the baffles A' and partitions A' are no less than half the height of the laser frequency doubling unit and no more than 1.5 times the height of the laser frequency doubling unit.

[0018] Furthermore, both sides of the base A are provided with L-shaped slots A; a cantilever A above the L-shaped slots A is marked with scale; the partition A' is L-shaped overall and slides within the L-shaped slots A; the partition A' comprises a horizontal portion a and a vertical portion a; the vertical portion a has a notch a adapted to the height of the cantilever A; the horizontal portion a's height is adapted to the height of the horizontal notch A of the L-shaped slot A; the horizontal portion a extends from the horizontal notch A and is locked by an adjustment handle A. The partition A' forms a sliding pair with the L-shaped slot A, enabling rapid positioning of the partition A' using the scale marked on the cantilever A, and rapid locking of the partition A' with the L-shaped slot A by adjusting the handle A. The detachable connection between the base A, the partition A', and the adjustment handle A makes the multi-wavelength laser frequency doubling device portable, further expanding the scope of its use.

[0019] Based on the above-mentioned multi-wavelength laser frequency doubling device, the present invention further provides a multi-wavelength spatial laser modulation device, which includes a fundamental frequency laser, a selective frequency doubling mechanism, and one or more laser shaping and amplifying mechanisms. When the laser shaping and amplifying mechanisms include two or more groups, all laser shaping and amplifying mechanisms have the same structure, including a multi-wavelength laser shaping component and a multi-wavelength laser gain amplifying component. The fundamental frequency laser output by the fundamental frequency laser undergoes selective frequency conversion through the selective frequency doubling mechanism, and then undergoes waveform shaping and power amplification through one or more groups of laser shaping and amplifying mechanisms, with the output of the first group of laser shaping and amplifying mechanisms serving as the input of the second group of laser shaping and amplifying mechanisms.

[0020] The fundamental frequency laser is used to provide fundamental frequency laser light with more than one wavelength;

[0021] The selective frequency doubling mechanism includes an optical beam splitter, a frequency doubling optical path and a non-frequency doubling optical path located in two output directions after the optical beam splitter, and an optical coupler A for coupling laser light generated by the frequency doubling optical path and the non-frequency doubling optical path; the frequency doubling optical path includes a multi-wavelength laser frequency doubling device and a first multi-wavelength laser filter provided in any of the aforementioned implementable methods; the first multi-wavelength laser filter is used to filter laser light generated by the frequency doubling process of the multi-wavelength laser frequency doubling device to obtain frequency doubling laser light containing a target wavelength; the fundamental frequency laser light from the fundamental frequency laser is directly transmitted to the optical coupler A via the non-frequency doubling optical path, and is coupled together with the frequency doubling laser light via the optical coupler A to obtain a laser beam containing laser light of the target wavelength;

[0022] The multi-wavelength laser shaping component includes a three-port unidirectional transmitter, a multi-wavelength laser waveform shaper, and a total reflector. The laser beam input into the multi-wavelength laser shaping component enters the multi-wavelength laser waveform shaper via the three-port unidirectional transmitter, and the multi-wavelength laser waveform shaper shapes the target wavelength laser beam in the laser beam. The shaped laser beam is reflected by the total reflector and then shaped a second time by the multi-wavelength laser waveform shaper. The laser beam after the second shaping is then input into the multi-wavelength laser gain amplification component via the three-port unidirectional transmitter.

[0023] The multi-wavelength laser gain amplification component includes a multi-wavelength laser gain amplification structure and a second multi-wavelength laser filter; the multi-wavelength laser gain amplification structure is used to amplify the power of the target wavelength laser input to the multi-wavelength laser gain amplification component; the second multi-wavelength laser filter is used to filter the laser beam output by the multi-wavelength laser gain amplification structure.

[0024] In one implementation, the wavelength range of the laser output by the fundamental frequency laser is 280 nm-2 μm. The fundamental frequency laser can be a single laser or a combination of multiple lasers; the laser output by the fundamental frequency laser is a single wavelength or multi-wavelength laser.

[0025] In one implementation, the selective frequency doubling mechanism is used to selectively frequency convert the laser light output from the fundamental frequency laser. An optical beam splitter is used to split the fundamental frequency laser light output from the fundamental frequency laser into two paths, one path entering the frequency doubling optical path and the other path entering the non-frequency doubling optical path. The optical beam splitter is preferably a 50:50 optical beam splitter.

[0026] Furthermore, the frequency-doubling optical path and the non-frequency-doubling optical path are respectively provided with optical switches, so that the selective frequency-doubling mechanism II has three switch connection modes:

[0027] (1) The optical switches on the frequency-doubling optical path and the non-frequency-doubling optical path are turned on at the same time; at this time, the coupling output of the selective frequency-doubling mechanism is: a laser beam containing a multi-wavelength target wavelength laser, which is composed of the fundamental frequency laser output by the fundamental frequency laser and the frequency-doubling laser converted by the multi-wavelength laser frequency-doubling device;

[0028] (2) Only the optical switch in the frequency-doubling optical path is turned on; at this time, the coupled output of the selective frequency-doubling mechanism is: the frequency-doubling laser converted by the multi-wavelength laser frequency-doubling device;

[0029] (3) Only the optical switch in the non-frequency-doubling optical path is turned on; at this time, the coupled output of the selective frequency-doubling mechanism is: the fundamental frequency laser output by the fundamental frequency laser.

[0030] Traditional frequency-doubling optical circuits typically only double the frequency of a single-wavelength laser. The multi-wavelength laser frequency-doubling device designed in this invention can achieve multi-wavelength frequency doubling. The first mounting slot of the multi-wavelength laser frequency-doubling device can simultaneously accommodate multiple laser frequency-doubling units, enabling the frequency-doubling optical circuit to simultaneously double the frequency of multiple wavelengths.

[0031] Furthermore, a total reflection mirror for adjusting the laser transmission direction is provided in the frequency-doubling optical path and / or the non-frequency-doubling optical path.

[0032] In the present invention, the number of laser shaping and amplifying mechanisms is set according to the needs of laser waveform shaping and power amplification. When one group of laser shaping and amplifying mechanisms is set, two Gaussian shaping of the laser waveform and one compensation and amplification of the laser power or energy are achieved; when N (N≥2) groups of laser shaping and amplifying mechanisms are set, 2N-fold Gaussian shaping of the laser waveform and N-fold compensation and amplification of the laser power or energy are achieved.

[0033] In one implementation, for a multi-wavelength laser shaping assembly, the three-port unidirectional transmitter includes ports ①, ②, and ③. Port ① serves as the laser input port for the multi-wavelength laser shaping assembly, port ② interfaces with one end of a multi-wavelength laser waveform shaper, and port ③ serves as the laser output port for the multi-wavelength laser shaping assembly. Furthermore, the three-port unidirectional transmitter is a polarizing beam splitter (PBS) or beam splitter, and is applicable to wavelengths ranging from 280 nm to 2 μm.

[0034] In one implementation, for a multi-wavelength laser shaping component, the multi-wavelength laser waveform shaper performs Gaussian shaping on lasers with wavelengths ranging from 280 nm to 2 μm. The multi-wavelength laser waveform shaper can simultaneously optimize the waveforms of lasers with multiple center wavelengths. As a bidirectional transmission device, the waveform shaper can Gaussian shape the laser waveform regardless of the input end, thereby improving the input laser waveform. Laser waveform shaping primarily utilizes a series of methods, such as appropriate filtering, delay, and amplitude adjustment, introduced into the circuit to modify the waveform of the laser pulse signal. Typical laser waveform shapers include liquid crystal spatial light modulators, acousto-optic tunable filters, laser pulse clipping shapers, and fiber-based shapers. The laser pulse clipping shaper is an all-solid-state laser pulse clipping system that utilizes a high-speed optoelectronic Q-switch, achieving rise and fall times as fast as 3 ns. It is ideally suited for laser pulse waveform shaping, laser pulse chopping, laser pulse clipping, regenerative amplifier switching, mode-locked pulse gating, cavity dumping, and Q-switching applications. Laser pulse clipping and shaping devices have the advantages of reliability, minimum radiation noise, solid state, high voltage switching, etc., suitable for intracavity and extracavity applications. The typical specifications of laser pulse clipping and shaping devices are:

[0035] (1) 250nm-2200nm (DKDP Pockels cell is suitable for 300-1320nm, BBO Pockels cell is suitable for 250-1320nm, RTP Pockels cell is suitable for 500-2200nm);

[0036] (2) Optical rise time and fall time: about 3ns (10mm aperture DKDP Pockels cell);

[0037] (3) Optical pulse width: about 8ns-1us;

[0038] (4) Repetition frequency: 1Hz-2500Hz.

[0039] In one possible implementation, for a multi-wavelength laser shaping component, the fully reflective mirror is a fully reflective mirror with an applicable wavelength range of 280 nm-2 μm and a reflection efficiency of 99.9%.

[0040] In one implementation, the multi-wavelength laser gain amplification component compensates for and amplifies the laser power or energy output by the multi-wavelength laser shaping component.

[0041] The multi-wavelength laser gain amplification structure provided by the present invention is designed to achieve multi-wavelength laser gain amplification. In the present invention, the multi-wavelength laser gain amplification structure includes a multi-wavelength laser gain amplification device; the multi-wavelength laser gain amplification device includes a base B and one or more laser gain units; two rows of second mounting slots are provided on both sides of the base B, parallel to each other along the length of the base B; each row of second mounting slots includes two or more coaxially arranged slots B, and the slots B in the two rows of second mounting slots are symmetrically arranged; the laser gain units are installed in the symmetrically arranged slots B in the two rows of second mounting slots; each laser gain unit is used to amplify the power of laser light within a specified wavelength range.

[0042] Laser gain amplification is primarily based on the process of stimulated emission, which amplifies optical signals by exciting atoms or molecules in a gain medium. When stimulated by external light (provided by a pump source), the gain medium (such as a solid, liquid, or gas) transitions to a higher energy level. When incident laser light interacts with these excited atoms or molecules, stimulated emission occurs, generating photons with the same frequency, coherent phase, and direction as the input laser light, thereby amplifying the optical signal.

[0043] Based on the above analysis, the multi-wavelength laser gain amplification structure is further configured with pump sources adapted to the target wavelengths and an equal number of optical couplers B as the pump sources. The laser light emitted by each pump source, after passing through the corresponding optical coupler B, enters the multi-wavelength laser gain amplification device along with the laser light incident on the multi-wavelength laser gain amplification structure for gain amplification. The laser light then passes through an optical collimator to output a laser beam containing the laser light at the target wavelength. The present invention imposes no restrictions on the choice of pump source; a pump source with a target wavelength within the corresponding operating band can be selected. For lasers with two or more target wavelengths whose absolute wavelength spacing is less than 20 nm, a single pump source can be used.

[0044] For multi-wavelength lasers, different wavelengths require different thicknesses for effective gain amplification, and different wavelengths experience varying degrees of power attenuation when passing through non-laser gain units. If the laser gain unit thickness is too small, laser power amplification is insufficient; if it is too thick, laser power attenuation at non-corresponding wavelengths is excessive. To ensure effective gain amplification of laser power at different wavelengths and effectively control the attenuation effects of laser power at different wavelengths, comprehensive calculations have determined that all laser gain units have the same width and height perpendicular to the length of base B, ranging from 3-4 cm in width and 1-2 cm in height, with a length along the length of base B ranging from 1.5-3.5 cm. Each laser gain unit can transmit laser light with a wavelength range of 280 nm to 2 μm, but each laser gain unit only amplifies laser light within its designated wavelength range. For laser light with non-corresponding wavelengths, aside from a certain power loss, no gain amplification, frequency conversion, wavelength conversion, or waveform conversion is performed. The laser gain unit can be a gain crystal block or a transparent, sealed cell filled with a gain medium. The gain medium can be a coumarin dye.

[0045] In one implementation, the second mounting slot provided by the present invention includes 10 card slots B, which can be used to fix 1-10 laser gain units.

[0046] The second mounting groove and the base B can be fixedly connected or slidably connected. When it is a slidably connected, laser gain units of different lengths can be installed, thereby meeting different laser gain requirements.

[0047] In embodiment (1), the second mounting slot is formed by baffles B mounted perpendicularly to the length of base B at both ends, and one or more partitions B located between the two baffles B. A slot B is formed between adjacent baffles B or between two adjacent partitions B. The baffles B and partitions B are designed to minimize air gaps between them and the laser gain unit. The baffles B and partitions B are each fixedly connected to base B. The baffles B and partitions B may have the same or different heights. Furthermore, the height of each baffle B and partition B is no less than half the height of the laser gain unit and no more than 1.5 times the height of the laser gain unit.

[0048] In embodiment (2), the second mounting slot is composed of baffles B' mounted perpendicularly to the length of base B at both ends, and one or more partitions B' located between the two baffles B'. Adjacent baffles B' and partitions B', or two adjacent partitions B', form a slot B. The baffles B' are fixedly or slidably connected to base B, while the partitions B' are slidably connected to base B. The heights of the baffles B' and partitions B' above base B may be the same or different. Furthermore, the heights of the baffles B' and partitions B' are no less than half the height of the laser gain unit and no more than 1.5 times the height of the laser gain unit.

[0049] Furthermore, the base B has L-shaped slots B on both sides; a cantilever B above the L-shaped slot B is marked with scale; the partition B' is L-shaped overall and slides within the L-shaped slot B. The partition B' comprises a horizontal portion b and a vertical portion b. The vertical portion b has a notch b that matches the height of the cantilever B. The horizontal portion b's height matches the height of the horizontal notch B of the L-shaped slot B. The horizontal portion b extends from the horizontal notch B and is locked by an adjustment handle B. The partition B' forms a sliding pair with the L-shaped slot B. The scale marked on the cantilever B enables quick positioning of the partition B', and the adjustment handle B enables quick locking of the partition B' with the L-shaped slot B. The detachable connection between the base B, partition B', and adjustment handle B makes the multi-wavelength laser gain amplifier device portable, further expanding the application range of multi-wavelength laser frequency doubling devices and multi-wavelength spatial laser modulation devices.

[0050] In one implementable manner, the first multi-wavelength laser filter is used to lock the central wavelength laser output by all laser frequency doubling units and filter out stray lasers other than these central wavelengths; the second multi-wavelength laser filter is used to lock the central wavelength laser output by all laser gain units and filter out stray lasers other than these central wavelengths.

[0051] It should be noted that:

[0052] (1) The laser is always incident perpendicular to the longitudinal section of the laser frequency doubling unit and the laser gain unit;

[0053] (2) In the entire optical path, the laser energy output by the previous device is less than the laser energy threshold that the next adjacent device can withstand;

[0054] (3) The single wavelength or multi-wavelength mentioned refers to the central wavelength of the laser.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] (1) The multi-wavelength laser frequency doubling device provided by the present invention can achieve frequency doubling of multiple wavelength lasers at the same time, which provides a new idea for achieving effective laser frequency doubling while greatly simplifying the laser optical path structure, reducing costs, and integrating optical systems. It breaks through the bottleneck of the previous method of frequency doubling a single wavelength laser and then achieving multi-wavelength frequency doubling laser output by laser beam combining, making the way to obtain multi-wavelength frequency doubling lasers more simplified.

[0057] (2) The multi-wavelength laser frequency doubling device provided by the present invention is a detachable structure. The selection of the laser frequency doubling unit can be adjusted according to the needs. It can be applied to different application fields and has a wide range of applicability. The first mounting groove and the base for fixing the laser frequency doubling unit can be further designed as a sliding pair to meet the needs of laser frequency doubling units of different sizes, thereby expanding the application field of the multi-wavelength laser frequency doubling device.

[0058] (3) The multi-wavelength spatial laser modulation device provided by the present invention can simultaneously realize the composite functions of multi-wavelength laser selective frequency up-conversion, multi-wavelength laser waveform modulation and shaping, multi-wavelength laser power amplification, and multi-wavelength laser filtering, providing a new idea for realizing efficient multi-wavelength laser modulation; and the components used in the structure are relatively low in price, especially for the laser first-level modulation and shaping structure. Compared with previous laser modulation devices, the number of components is less, which can effectively save costs;

[0059] (4) The multi-wavelength spatial laser modulation device provided by the present invention solves the problem of limited output laser peak power due to waveform distortion and deviation from Gaussian shape in the past through the multi-wavelength laser shaping component; it can effectively increase the energy of single laser pulses and enhance the effect of laser application;

[0060] (5) The multi-wavelength spatial laser modulation device provided by the present invention can realize the simultaneous operation of multiple laser gain media, providing a new idea for the simultaneous amplification of multi-wavelength lasers;

[0061] (6) The multi-wavelength spatial laser modulation device provided by the present invention has a simple structure and is easy to build; the number of laser frequency doubling units and laser shaping and amplifying mechanisms can be increased or decreased as needed, and it has strong scalability and flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 A schematic structural diagram of a multi-wavelength laser frequency doubling device provided in Example 1 of the present invention;

[0063] Figure 2 A side view of the multi-wavelength laser frequency doubling device provided in Example 1 of the present invention;

[0064] Figure 3 A schematic structural diagram of a multi-wavelength laser frequency doubling device provided in Example 2 of the present invention;

[0065] Figure 4 A schematic cross-sectional view of the multi-wavelength laser frequency doubling device provided in Example 2 of the present invention, taken perpendicular to the length direction of the base A;

[0066] Figure 5 This is a top view of the assembled base A, baffle A', and partition A' in Example 2 of the present invention;

[0067] Figure 6 Schematic diagram of a cross section of the base A perpendicular to its length direction in Example 2 of the present invention;

[0068] Figure 7 Schematic diagram of the structure of the partition A' in Example 2 of the present invention;

[0069] Figure 8 A schematic structural diagram of a multi-wavelength spatial laser modulation device provided in Example 3 of the present invention;

[0070] Figure 9 Schematic diagram of the multi-wavelength laser gain amplification structure in Example 3 of the present invention;

[0071] Figure 10 Schematic diagram of the structure of a multi-wavelength laser gain amplifier device in Example 3 of the present invention;

[0072] Figure 11 A schematic structural diagram of a multi-wavelength spatial laser modulation device provided in Example 4 of the present invention;

[0073] Figure 12 Schematic diagram of the structure of a multi-wavelength laser gain amplifier device in Example 4 of the present invention;

[0074] Figure 13 Schematic diagram of a cross section of the multi-wavelength laser gain amplifier device perpendicular to the length direction of the base B in Example 4 of the present invention;

[0075] Figure 14 This is a top view of the assembled base B, baffle B', and partition B' in Example 4 of the present invention;

[0076] Figure 15 Schematic diagram of a cross section of the base B perpendicular to its length direction in Example 4 of the present invention;

[0077] Figure 16 Schematic diagram of the structure of the partition B' in Example 4 of the present invention;

[0078] In the figure, I-fundamental frequency laser; II-selective frequency doubling mechanism; III-multi-wavelength laser shaping component; IV-multi-wavelength laser gain amplification component;

[0079] 1-Multi-wavelength laser frequency doubling device; 2-Optical beam splitter; 3-Optical coupler A; 4-First multi-wavelength laser filter; 5-Three-port unidirectional transmitter; 6-Multi-wavelength laser waveform shaper; 7-Total reflector; 8-Multi-wavelength laser gain amplifier structure; 9-Second multi-wavelength laser filter; K1-First optical switch; K2-Second optical switch;

[0080] 11 - Base A; 111 - L-shaped slide A; 112 - Cantilever A; 113 - Horizontal notch A; 12 - Laser frequency doubling unit; 13 - First mounting slot; 131 - Baffle A; 132 - Partition A; 133 - Baffle A'; 134 - Partition A'; 1341 - Horizontal portion a; 1342 - Vertical portion a; 1343 - Notch a; 14 - Adjustment handle A;

[0081] 81-Multi-wavelength laser gain amplifier device; 811-Base B; 8111-L-shaped slide groove B; 8112-Cantilever B; 8113-Horizontal slot B; 812-Laser gain unit; 813-Second mounting slot; 8131-Baffle B; 8132-Partition B; 8133-Baffle B'; 8134-Partition B'; 81341-Horizontal part b; 81342-Vertical part b; 81343-Notch b; 814-Adjustment handle B; 82-Pump source; 83-Optical coupler B; 84-Optical collimator. DETAILED DESCRIPTION

[0082] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0083] Example 1

[0084] This embodiment provides a multi-wavelength laser frequency doubling device, such as Figure 1 and Figure 2 As shown, it includes a base A11 and one or more laser frequency doubling units 12 (three laser frequency doubling units 12 are shown in this embodiment).

[0085] Each laser frequency doubling unit 12 corresponds to a laser of a certain wavelength and is used to perform frequency doubling processing on the laser of the corresponding wavelength, and can transmit lasers with a wavelength range of 280nm-2μm. For example, the laser frequency doubling unit 12 can be a frequency doubling crystal block or a transparent closed pool filled with a frequency doubling medium. The frequency doubling medium can be a coumarin series dye. The dimensions of all laser frequency doubling units are the same. In this embodiment, the length, width and height directions of the base A11 are used as the direction reference, and the laser frequency doubling unit 12 is 2cm long, 4cm wide and 2cm high.

[0086] like Figure 1 and Figure 2 As shown, two rows of first mounting slots 13 are provided on both sides of the base A11, parallel to the length direction of the base A11. Each row of first mounting slots 13 includes 10 coaxially arranged slots A, and the slots A on the two rows of first mounting slots 13 are symmetrically arranged. The laser frequency doubling unit 12 is installed in the slots A symmetrically arranged in the two rows of first mounting slots 13. Specifically, the first mounting slot 13 is composed of baffles A131 installed at both ends of the base A11 perpendicular to the length direction of the base A11 and 9 partitions A132 located between the two baffles A131. The baffles A131 and partitions A132 are respectively fixedly connected to the base A11. In order to effectively support the above-mentioned laser frequency doubling unit 12, the width of the base A11 is 4 cm and the height is 2 cm. The length is determined by the length of the baffles A131, partitions A132 and the laser frequency doubling unit 12.

[0087] A slot A is formed between adjacent baffles A131 and partitions A132, or between two adjacent partitions A132. The slot A is designed to minimize the air gap between it and the laser frequency doubling unit 12. In this embodiment, the heights of baffles A131 and partitions A132 are the same as the height of the laser frequency doubling unit 12, both 2 cm. Baffle A131 is 1 cm long and 1 cm wide; partitions A132 are 0.3 cm long and 1 cm wide.

[0088] Example 2

[0089] This embodiment provides a multi-wavelength laser frequency doubling device, such as Figure 3 and Figure 4 As shown, it includes a base A11 and one or more laser frequency doubling units 12 (three laser frequency doubling units 12 are shown in this embodiment).

[0090] Each laser frequency doubling unit 12 corresponds to a laser of a certain wavelength and is used to perform frequency doubling processing on the laser of the corresponding wavelength, and can transmit lasers with a wavelength range of 280nm-2μm. For example, the laser frequency doubling unit 12 can be a frequency doubling crystal block or a transparent closed pool filled with a frequency doubling medium. The frequency doubling medium can be a coumarin series dye. The dimensions of all laser frequency doubling units 12 are the same. In this embodiment, the length, width and height directions of the base A11 are used as the direction reference, and the laser frequency doubling unit 12 is 2cm long, 4cm wide and 2cm high.

[0091] like Figure 3 and Figure 4 As shown, two rows of first mounting slots 13 are provided on both sides of base A11, parallel to each other along its length. Each row of first mounting slots 13 includes ten coaxially arranged slots A, and the slots A in both rows of first mounting slots 13 are symmetrically arranged. The laser frequency doubling unit 12 is mounted within the symmetrically arranged slots A in both rows of first mounting slots 13. Specifically, the first mounting slots 13 are formed by baffles A'133 installed perpendicularly to the length of base A11 at both ends, and nine partitions A'134 located between the two baffles A'133. To effectively support the laser frequency doubling unit 12, base A11 is 4 cm wide and 2 cm high, with its length determined by the lengths of the baffles A'133, partitions A'134, and the laser frequency doubling unit 12.

[0092] A slot A is formed between adjacent baffles A'133 and partitions A'134, or between two adjacent partitions A'134. The size of the slot A is designed to minimize the air layer between the slot A and the laser frequency doubling unit 12.

[0093] In this embodiment, the baffle A'133 is fixedly connected to the base A11. The height of the baffle A'133 is the same as that of the laser frequency doubling unit 12, both being 2 cm. The baffle A'133 is 1 cm long and 1 cm wide.

[0094] In this embodiment, the partition A'134 is slidably connected to the base A11. Figures 3-7 As shown, L-shaped slide grooves A111 are provided on both sides of the base A11; Figure 6As shown, the L-shaped chute A111 includes a horizontal slot A113 extending horizontally and a vertical slot A extending vertically. The horizontal slot A113 is 0.7 cm high, and the vertical slot A is 0.5 cm wide. A cantilever A112 above the L-shaped chute A111 is 0.5 cm wide and 0.6 cm high, and is marked with graduations. The partition A'134 is L-shaped overall and slides within the L-shaped chute A111. Partition A'134 includes a horizontal part a1341 and a vertical part a1342. The horizontal part a1341 is 1.8 cm wide and 0.6 cm high, and the vertical part a1342 is 1 cm wide and 2.7 cm high. The lengths of the horizontal part a1341 and the vertical part a1342 are both 3 mm. The vertical part a1342 is provided with a notch a1343 that matches the height of the cantilever A112. The notch a1343 is 0.5 cm wide and 0.7 cm high. The height of the horizontal part a1341 is matched with the height of the horizontal slot A113 of the L-shaped slide A111, and the horizontal part a1341 extends from the horizontal slot A113. The extended part is locked by the adjusting handle A14 and the screw. The adjusting handle A14 is provided with a threaded hole that matches the screw. During installation, the partition A'134 can be buckled on the cantilever A112 through the L-shaped slide groove A111, and the horizontal part a1341 of the partition A'134 is placed along the long side gap of the L-shaped slide groove A111, and then rotated 90° to be placed on the cantilever A112. Pull the horizontal part a1341 of the partition A'134 to slide on the cantilever A112. After selecting the appropriate position according to the scale, fasten the adjustment handle A14 and the horizontal part a1341 together with the screws to fix the partition A'134 to the corresponding position of the cantilever A112.

[0095] Through the sliding connection structure design between the partition A'134 and the base A11, not only can the laser frequency doubling unit 12 be effectively fixed and the air layer between the partition A'134 and the laser frequency doubling unit 12 be reduced as much as possible, but also the fixing requirements of laser frequency doubling units 12 of different sizes can be met.

[0096] Example 3

[0097] This embodiment provides a multi-wavelength spatial laser modulation device, such as Figure 8 As shown, it comprises a fundamental frequency laser I, a selective frequency doubling mechanism II, and a set of laser shaping and amplification mechanisms. The laser shaping and amplification mechanisms comprise a multi-wavelength laser shaping assembly III and a multi-wavelength laser gain amplification assembly IV. The fundamental frequency laser output by fundamental frequency laser I undergoes selective frequency conversion via the selective frequency doubling mechanism II, undergoes two waveform shaping cycles via the multi-wavelength laser shaping assembly III, and finally achieves laser gain amplification via the multi-wavelength laser gain amplification assembly IV.

[0098] Fundamental frequency laser I is used to provide laser light of more than one wavelength. The wavelength range of the laser light output by the fundamental frequency laser is 280 nm to 2 μm. The fundamental frequency laser I can be a single laser or multiple lasers. The fundamental frequency laser outputs laser light of a single wavelength or multiple wavelengths.

[0099] The selective frequency doubling mechanism II is used to selectively convert the frequency of the fundamental frequency laser output. It comprises an optical beam splitter 2, a frequency-doubling optical path and a non-frequency-doubling optical path located in two output directions after the optical beam splitter 2, and an optical coupler A3 that couples the lasers generated by the frequency-doubling and non-frequency-doubling paths. The frequency-doubling optical path comprises a first optical switch K1, a multi-wavelength laser frequency-doubling device 1, and a first multi-wavelength laser filter 4, arranged in that order. A second optical switch K2 is provided on the non-frequency-doubling optical path.

[0100] The multi-wavelength laser frequency doubling device 1 is the multi-wavelength laser frequency doubling device provided in the second embodiment.

[0101] The optical beam splitter 2 used is a 50:50 optical beam splitter.

[0102] The first optical switch K1 and the second optical switch K2 are selectively turned on or off, so that the selective frequency doubling mechanism II has three switch connection modes:

[0103] (1) The first optical switch K1 on the frequency-doubling optical path and the second optical switch K2 on the non-frequency-doubling optical path are turned on simultaneously. At this time, the coupled output of the selective frequency-doubling mechanism II is: a laser beam containing a multi-wavelength target wavelength laser, which is composed of the fundamental frequency laser output by the fundamental frequency laser I and the frequency-doubling laser converted by the multi-wavelength laser frequency-doubling device 1;

[0104] (2) Only the first optical switch K1 in the frequency doubling optical path is turned on; at this time, the coupled output of the selective frequency doubling mechanism II is: the frequency doubling laser converted by the multi-wavelength laser frequency doubling device 1;

[0105] (3) Only the second optical switch K2 in the non-frequency doubling optical path is turned on; at this time, the coupled output of the selective frequency doubling mechanism II is: the fundamental frequency laser output by the fundamental frequency laser I.

[0106] The first multi-wavelength laser filter 4 is used to filter the laser beam after the frequency doubling process of the multi-wavelength laser frequency doubling device 1 to obtain laser light containing a target wavelength.

[0107] The fundamental frequency laser from the fundamental frequency laser I is directly transmitted to the optical coupler A3 via the non-frequency-doubled optical path, and is coupled together with the frequency-doubled laser after filtering by the first multi-wavelength laser filter 4 through the optical coupler A3 to obtain a laser beam containing the target wavelength laser.

[0108] To adjust the direction of the laser light in the frequency-doubling optical path after passing through the optical beam splitter 2, this embodiment further includes a first total-reflection mirror and a second total-reflection mirror in the frequency-doubling optical path. The first total-reflection mirror is positioned in one of the exit directions of the optical beam splitter, with the multi-wavelength laser frequency-doubling device 1 and the first multi-wavelength laser filter 4 located in the reflection direction of the first total-reflection mirror. The second total-reflection mirror is positioned in the exit direction of the first multi-wavelength laser filter 4, and the laser light reflected by the second total-reflection mirror enters the optical coupler A3.

[0109] The multi-wavelength laser shaping assembly III is used to Gaussian shape the laser light output from the selective frequency doubling mechanism II. It comprises a three-port unidirectional transmitter 5, a multi-wavelength laser waveform shaper 6, and a total reflector 7. The laser light output from the selective frequency doubling mechanism II enters the multi-wavelength laser waveform shaper 6 via the three-port unidirectional transmitter 5. The multi-wavelength laser waveform shaper 6 shapes the laser light to the target wavelength. After reflection from the total reflector 7, the shaped laser light is then reshaped by the multi-wavelength laser waveform shaper 6 for a second time. The reshaped laser light then passes through the three-port unidirectional transmitter 5 and is input into the multi-wavelength laser gain amplifier assembly IV.

[0110] The three-port unidirectional transmitter 5 is a polarizing beam splitter (PBS) or beam splitter, and is suitable for wavelengths between 280 nm and 2 μm. It includes ports ①, ②, and ③. Port ① serves as the laser input for the multi-wavelength laser shaping assembly, port ② interfaces with one end of the multi-wavelength laser waveform shaper 6, and port ③ serves as the laser output for the multi-wavelength laser shaping assembly.

[0111] In this embodiment, the multi-wavelength laser waveform shaper 6 performs Gaussian shaping on laser light with a wavelength range of 280 nm to 2 μm. This multi-wavelength laser waveform shaper 6 utilizes a laser pulse clipping shaper. The total reflector 7 utilizes a fully reflective mirror with an applicable wavelength range of 280 nm to 2 μm and a reflection efficiency of 99.9%.

[0112] The multi-wavelength laser gain amplification component IV is used to compensate and amplify the laser power or energy output by the multi-wavelength laser shaping component III. The multi-wavelength laser gain amplification component IV includes a multi-wavelength laser gain amplification structure 8 and a second multi-wavelength laser filter 9.

[0113] The multi-wavelength laser gain amplification structure 8 is used to perform gain amplification on the target wavelength laser. Figure 9As shown, the multi-wavelength laser gain amplification structure 8 includes a multi-wavelength laser gain amplification device 81, a pump source 82 adapted to the target wavelength, an equal number of optical couplers B83 as the pump sources 82, and an optical collimator 84. The laser light emitted by each pump source 82 passes through the corresponding optical coupler B83 and, together with the laser light incident on the multi-wavelength laser gain amplification structure 8, enters the multi-wavelength laser gain amplification device 81 for gain amplification. The laser light then passes through the optical collimator 84 to output a laser beam containing the target wavelength laser light.

[0114] like Figure 10 As shown, the multi-wavelength laser gain amplifier device 81 includes a base B811 and one or more laser gain units 812 (two laser gain units 812 are shown in this embodiment).

[0115] Each laser gain unit 812 amplifies laser light within a specified wavelength range and is capable of transmitting laser light in the wavelength range of 280 nm to 2 μm. For example, a laser gain unit 812 may be a gain crystal block or a transparent, sealed cell filled with a gain medium. The gain medium may be a coumarin-based dye. All laser gain units have identical dimensions. In this embodiment, using the length, width, and height of base B811 as the directional reference, the laser gain units 812 are 3 cm long, 4 cm wide, and 2 cm high.

[0116] Two rows of second mounting slots 813 are arranged parallel to each other along the length of the base B811. Each row of second mounting slots 813 includes ten coaxially arranged slots B, and the slots B in the two rows of second mounting slots 813 are symmetrically arranged. The laser gain unit 812 is mounted within the symmetrically arranged slots B in the two rows of second mounting slots 813. Specifically, the second mounting slots 813 consist of baffles B8131 mounted perpendicular to the length of the base B811 at both ends, and nine partitions B8132 positioned between the two baffles B8131. The baffles B8131 and partitions B8132 are fixedly connected to the base B811. To effectively support the laser gain unit 812, the base B811 is 4 cm wide and 2 cm high. The length is determined by the lengths of the baffles B8131, partitions B8132, and the laser gain unit 812.

[0117] A slot B is formed between adjacent baffles B8131 and partitions B8132, or between two adjacent partitions B8132. The slot B is sized to minimize the air gap between it and the laser gain unit 812. In this embodiment, the height of the baffles B8131 and partitions B8132 is the same as that of the laser gain unit 812, both being 2 cm. Baffles B8131 are 1 cm long and 1 cm wide, while partitions B8132 are 0.3 cm long and 1 cm wide.

[0118] In this embodiment, there is no restriction on the selection of the pump source 82 , and a pump source with a target wavelength within the corresponding working band can be selected; for two or more target wavelength lasers with an absolute value of a wavelength spacing less than 20 nm, one pump source can be used. Figure 9 Figure 8 shows an example of a multi-wavelength laser gain amplifier structure 8 equipped with two pump sources 82. These two pump sources 82 are equipped with two optical couplers B83. The laser light emitted by the two pump sources 82 passes through the corresponding optical couplers B83, and then, along with the laser light incident on the multi-wavelength laser gain amplifier structure 8, enters the multi-wavelength laser gain amplifier device 81 for power amplification. The laser light then passes through an optical collimator 84 to output a laser beam containing the target wavelength.

[0119] The second multi-wavelength laser filter 9 is used to filter the laser beam output by the multi-wavelength laser gain amplification structure 8 to obtain the final target wavelength laser.

[0120] Example 4

[0121] This embodiment is a further improvement based on embodiment 3.

[0122] The multi-wavelength spatial laser modulation device provided in this embodiment is as follows: Figure 11 As shown, it comprises a fundamental frequency laser I, a selective frequency doubling mechanism II, and three sets of laser shaping and amplification mechanisms. All three sets of laser shaping and amplification mechanisms share the same structure, including a multi-wavelength laser shaping component III and a multi-wavelength laser gain amplification component IV. The fundamental frequency laser output from fundamental frequency laser I undergoes selective frequency conversion via the selective frequency doubling mechanism II. The laser then undergoes waveform shaping and power amplification, sequentially, via the three sets of laser shaping and amplification mechanisms. The output of the first set of laser shaping and amplification mechanisms serves as the input to the next set of laser shaping and amplification mechanisms.

[0123] The structures of the fundamental frequency laser I, the selective frequency doubling mechanism II, and the multi-wavelength laser shaping component III are the same as those in Example 3.

[0124] In this embodiment, Figure 11 As shown, the multi-wavelength laser gain amplification component IV includes a multi-wavelength laser gain amplification structure 8 and a second multi-wavelength laser filter 9. Figure 9 As shown, the multi-wavelength laser gain amplification structure 8 includes a multi-wavelength laser gain amplification device 81, a pump source 82 adapted to the target wavelength, an equal number of optical couplers B83 as the pump sources 82, and an optical collimator 84. The laser light emitted by each pump source 82 passes through the corresponding optical coupler B83, and then enters the multi-wavelength laser gain amplification device 81 together with the laser light incident on the multi-wavelength laser gain amplification structure 8 for power amplification. The laser light then passes through the optical collimator 84 to output a laser beam containing the laser light of the target wavelength.

[0125] like Figures 12-13As shown, the multi-wavelength laser gain amplifier device 81 includes a base B811 and one or more laser gain units 812 (two laser gain units 812 are shown in this embodiment).

[0126] Each laser gain unit 812 amplifies laser light within a specified wavelength range and is capable of transmitting laser light in the wavelength range of 280 nm to 2 μm. For example, a laser gain unit 812 may be a gain crystal block or a transparent, sealed cell filled with a gain medium. The gain medium may be a coumarin-based dye. All laser gain units have identical dimensions. In this embodiment, using the length, width, and height of base B811 as the directional reference, the laser gain units 812 are 3 cm long, 4 cm wide, and 2 cm high.

[0127] like Figures 12-13 As shown, two rows of second mounting slots 813 are provided on either side of the base B811, parallel to each other along its length. Each row of second mounting slots 813 includes ten coaxially arranged slots B, and the slots B in the two rows of second mounting slots 813 are symmetrically arranged. The laser gain unit 812 is mounted within the symmetrically arranged slots B in the two rows of second mounting slots 813. Specifically, the second mounting slots 813 are formed by baffles B'8133 installed perpendicularly to the length of the base B811 at both ends, and nine partitions B'8134 located between the two baffles B'8133. To effectively support the laser gain unit 812, the base B811 is 4 cm wide and 2 cm high, with its length determined by the lengths of the baffles B'8133, partitions B'8134, and the laser gain unit 812.

[0128] A slot B is formed between adjacent baffles B'8133 and partitions B'8134, or between two adjacent partitions B'8134, and the size of the slot B is designed to minimize the air layer between the slot B and the laser gain unit 812.

[0129] In this embodiment, the baffle B'8133 is fixedly connected to the base B811. The height of the baffle B'8133 is the same as that of the laser gain unit 812, both being 2 cm. The baffle B'8133 is 1 cm long and 1 cm wide.

[0130] In this embodiment, the partition B'8134 is slidably connected to the base B811. Figures 12-16 As shown, L-shaped sliding grooves B8111 are provided on both sides of the base B811; Figure 15As shown, the L-shaped chute B8111 comprises a horizontal slot B8113 extending horizontally and a vertical slot B extending vertically. The horizontal slot B8113 is 0.7 cm high, while the vertical slot B is 0.5 cm wide. The cantilevered arm B8112 above the L-shaped chute B8111 is 0.5 cm wide and 0.6 cm high, and is marked with scale. The partition B'8134 is L-shaped overall and slides within the L-shaped chute B8111. The partition B'8134 includes a horizontal part b81341 and a vertical part b81342. The horizontal part b81341 is 1.8 cm wide and 0.6 cm high, and the vertical part b81342 is 1 cm wide and 2.7 cm high. The lengths of the horizontal part b81341 and the vertical part b81342 are both 3 mm. The vertical part b81342 is provided with a notch b81343 that matches the height of the cantilever B8112. The notch b81343 is 0.5 cm wide and 0.7 cm high. The height of the horizontal part b81341 is matched with the height of the horizontal slot B8113 of the L-shaped slide B8111, and the horizontal part b81341 extends from the horizontal slot B8113. The extended part is locked by the adjusting handle B814 and the screw. The adjusting handle B814 is provided with a threaded hole that matches the screw. During installation, the partition B'8134 can be buckled on the cantilever B8112 through the L-shaped slide groove B8111. The horizontal part b81341 of the partition B'8134 is placed along the gap of the long side of the L-shaped slide groove B8111, and then rotated 90° to be placed on the cantilever B8112. Pull the horizontal part b81341 of the partition B'8134 to slide on the cantilever B8112. After selecting the appropriate position according to the scale, fasten the adjustment handle B814 and the horizontal part b81341 together with the screws to fix the partition B'8134 to the corresponding position of the cantilever B8112.

[0131] Through the sliding connection structure design between the partition B'8134 and the base B811, not only can the laser gain unit 812 be effectively fixed and the air layer between the partition B'8134 and the laser gain unit 812 be reduced as much as possible, but also the fixing requirements of laser gain units 812 of different sizes can be met.

[0132] In this embodiment, there is no restriction on the selection of the pump source. A pump source with a target wavelength within the corresponding working band can be selected. For lasers with two or more target wavelengths whose absolute wavelength spacing is less than 20 nm, one pump source can be used.

[0133] The second multi-wavelength laser filter 9 is used to filter the laser beam output by the multi-wavelength laser gain amplification structure 8 to obtain the final target wavelength laser.

[0134] In order to optimize the spatial configuration of the multi-wavelength spatial laser modulation device, this embodiment also provides a third total reflection mirror for adjusting the laser direction in the laser emission direction of the second group of laser shaping and amplifying mechanisms. The laser beam reflected by the third reflection mirror enters the third group of laser shaping and amplifying mechanisms for waveform shaping and power amplification.

[0135] Application Example 1

[0136] This application example realizes modulation output of six target wavelengths based on the multi-wavelength spatial laser modulation device provided in Example 4.

[0137] In a specific implementation, the fundamental laser I is a potassium-rubidium-cesium (K-Rb-Cs) three-wavelength alkali metal vapor laser. During operation, the fundamental laser I outputs a mixed three-wavelength laser: 770nm (K laser), 795nm (Rb laser), and 895nm (Cs laser). Three BBO crystal blocks for the three wavelengths of 770nm, 795nm, and 895nm are pre-inserted into the first mounting slot 13. When these three BBO crystal blocks are placed in the first mounting slot 13, they have different crystal orientations relative to the incident light direction to achieve frequency doubling of the three wavelengths. The first multi-wavelength laser filter 4 is used to lock the three-wavelength lasers of 385nm, 398nm, and 448nm. The three-port unidirectional transmitter 5 is a PBS (polarization beam splitter). The multi-wavelength laser waveform shaper 6 utilizes a laser pulse clipping shaper. The multi-wavelength laser gain amplifier device 81 comprises two laser gain units: a titanium sapphire crystal and a transparent, sealed cell filled with coumarin. These units provide gain amplification for six wavelengths: 770nm, 795nm, 895nm, 385nm, 398nm, and 448nm. Because the absolute distance between 385nm and 398nm is less than 20nm, the same pump source can be used. Therefore, the multi-wavelength laser gain amplifier structure 8 includes five pump sources 82 adapted to each target wavelength and five optical couplers B83. A second multi-wavelength laser filter 9 is used to lock the six laser wavelengths: 770nm, 795nm, 895nm, 385nm, 398nm, and 448nm.

[0138] When the first optical switch K1 and the second optical switch K2 are simultaneously turned on, half of the three-wavelength laser beam remains as a three-wavelength laser beam of 770nm, 795nm, and 895nm after passing through the second optical switch K2. The other half of the beam, after passing through the first optical switch K1, is frequency-doubled by the multi-wavelength laser frequency-doubling device 1 to produce a three-wavelength laser beam of 385nm, 398nm, and 448nm. This is then locked to the three-wavelength laser beam of 385nm, 398nm, and 448nm after passing through the first multi-wavelength laser filter 4, and other stray light is filtered out before output. The optical coupler A3 transmits the three-wavelength laser beams of 770nm, 795nm, and 895nm, while reflecting the three-wavelength laser beams of 385nm, 398nm, and 448nm. Therefore, after the two beams are coupled simultaneously through the optical coupler A3, a six-wavelength alkali metal laser beam output of 770nm, 795nm, 895nm, 385nm, 398nm, and 448nm is produced. These six wavelengths of laser light enter through port ① of the three-port unidirectional transmitter 5 and exit through port ② of the three-port unidirectional transmitter 5. A multi-wavelength laser waveform shaper 6 and a total reflector 7 are two devices capable of processing these six wavelengths of laser light. The multi-wavelength laser waveform shaper 6 has laser transmission channels for these six wavelengths and can perform Gaussian shaping on the waveforms of these six wavelengths of laser light. After waveform shaping, the six-wavelength laser light is reflected by the total reflector 7 at a rate of 99.9% and then enters the multi-wavelength laser waveform shaper 6 again for secondary waveform shaping. At this point, the polarization characteristics of the six-wavelength laser light have changed by π / 2. Therefore, after exiting the multi-wavelength laser waveform shaper 6, the six-wavelength laser light is output through port ③ of the three-port unidirectional transmitter 5 and then amplified and compensated for power by the multi-wavelength laser gain amplifier 8.

[0139] The amplified laser light is then filtered out by the second multi-wavelength laser filter 9 to lock the lasers with center wavelengths of 770 nm, 795 nm, 895 nm, 385 nm, 398 nm, and 448 nm.

[0140] According to the above method, the six-wavelength laser is further subjected to waveform shaping and power amplification by the second group of laser shaping and amplification mechanisms and waveform shaping and power amplification by the third group of laser shaping and amplification mechanisms. As a result, six-wavelength alkali metal laser outputs of 770nm, 795nm, 895nm, 385nm, 398nm, and 448nm are obtained, which have undergone six waveform shapings and three energy / power amplifications. The deviation between the center wavelength and the target wavelength does not exceed 2nm.

[0141] Application Example 2

[0142] This application example realizes dual-wavelength modulation output based on the multi-wavelength spatial laser modulation device provided in Example 4.

[0143] In a specific implementation, the fundamental frequency laser 1 is an Nd:YAG solid-state laser. During operation, the fundamental frequency laser 1 outputs a single-wavelength laser at 1064 nm. A frequency-doubled KTP crystal block for the 1064 nm wavelength is pre-inserted into the first mounting slot 13. The first multi-wavelength laser filter 4 is used to lock the 532 nm wavelength laser. The three-port unidirectional transmitter 5 is a polarization beam splitter (PBS). The multi-wavelength laser waveform shaper 6 utilizes a laser pulse clipping shaper. The multi-wavelength laser gain amplifier 81 includes two laser gain units (Nd:YAG crystal and a transparent, sealed dye cell filled with coumarin) that respectively amplify the 1064 nm and 532 nm wavelength lasers. The multi-wavelength laser gain amplifier structure 8 is equipped with two pump sources 82 adapted for the respective target wavelengths and two optical couplers B 83. The second multi-wavelength laser filter 9 is used to lock the 1064 nm and 532 nm wavelength lasers.

[0144] When the first optical switch K1 and the second optical switch K2 are simultaneously turned on, half of the 1064nm laser beam remains at 1064nm after passing through the second optical switch K2. The other half of the 1064nm laser beam passes through the first optical switch K1 and is frequency-doubled by the multi-wavelength laser frequency-doubling device 1 to obtain a 532nm laser beam. This is then locked to the 532nm laser beam by the first multi-wavelength laser filter 4, and other stray light is filtered out before outputting a frequency-doubled laser beam in the 532nm band. Optical coupler A3 transmits the 1064nm laser beam and reflects the 532nm laser beam. Therefore, after the two beams are coupled simultaneously by optical coupler A3, a dual-wavelength laser beam with wavelengths of 1064nm and 532nm is output. Lasers of these wavelengths enter through port ① of the three-port unidirectional transmitter 5 and exit through port ② of the three-port unidirectional transmitter 5. The multi-wavelength laser waveform shaper 6 and total reflector 7 are two devices capable of processing 1064nm and 532nm lasers. The multi-wavelength laser waveform shaper 5 has transmission channels for these two wavelengths and can perform Gaussian shaping on the waveforms of the 1064nm and 532nm lasers. The shaped dual-wavelength lasers are reflected by the total reflector 7 at a rate of 99.9% and then enter the multi-wavelength laser waveform shaper 6 again for secondary waveform shaping. At this point, the polarization characteristics of the 1064nm and 532nm dual-wavelength lasers have changed by π / 2. Therefore, the two wavelengths of laser light are output from the multi-wavelength laser waveform shaper 6 through port ③ of the three-port unidirectional transmitter 5 and are then compensated and amplified by the multi-wavelength laser gain amplifier structure 8.

[0145] The amplified laser light is then filtered out by the second multi-wavelength laser filter 9 to lock the dual-wavelength laser with center wavelengths of 1064 nm and 532 nm.

[0146] In the above manner, the dual-wavelength laser is subjected to wave shaping and power amplification by the second set of laser shaping and amplifying mechanisms, and then subjected to wave shaping and power amplification by the third set of laser shaping and amplifying mechanisms, so that the dual-wavelength laser output of 1064 nm and 532 nm, which has been subjected to wave shaping six times and power amplification three times, is obtained, and the deviation between the central wavelength and the target wavelength is not more than 2 nm.

[0147] Those skilled in the art will understand that the embodiments described herein are for the purpose of helping the reader understand the principles of the present application, and should be understood as not limiting the scope of protection of the present application to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations according to the technical inspiration provided by the present application without departing from the essence of the present application, and these modifications and combinations are still within the scope of protection of the present application.

Claims

1. A multi-wavelength laser frequency doubling device, characterized in that: The invention comprises a base A (11) and one or more laser frequency doubling units (12); two rows of first mounting grooves (13) are provided on both sides of the base A (11) and are parallel to the length direction of the base A (11); each row of first mounting grooves (13) comprises two or more coaxially arranged card grooves A, and the card grooves A on the two rows of first mounting grooves (13) are symmetrically arranged; the laser frequency doubling units (12) are installed in the card grooves A symmetrically arranged in the two rows of first mounting grooves (13); each laser frequency doubling unit (12) corresponds to a laser of a wavelength and is used for performing frequency doubling processing on the laser of the corresponding wavelength; When the number of the laser frequency doubling units (12) is more than two, all the laser frequency doubling units (12) have the same width and height perpendicular to the length direction of the base A (11); The first mounting groove (13) is composed of baffles A' (133) installed at both ends of the base A (11) in a vertical direction of the length of the base A (11) and one or more partitions A' (134) located between the two baffles A' (133), and a slot A is formed between adjacent baffles A' (133) and partitions A' (134), or between two adjacent partitions A' (134); the baffles A' (133) and the base A (11) are fixedly or slidably connected, and the partitions A' (134) and the base A (11) are slidably connected; the heights of the baffles A' (133) and the partitions A' (134) above the base A (11) are the same or different; Both sides of the base A (11) are provided with L-shaped slide grooves A (111); a scale is marked on the cantilever A (112) above the L-shaped slide groove A (111); the partition A' (134) is L-shaped as a whole and is slidably installed in the L-shaped slide groove A (111); the partition A' (134) includes a horizontal portion a (1341) and a vertical portion a (1342), the vertical portion a (1342) is provided with a notch a (1343) adapted to the height of the cantilever A (112), the height of the horizontal portion a (1341) is adapted to the height of the horizontal notch A (113) of the L-shaped slide groove A (111), and the horizontal portion a (1341) extends from the horizontal notch A (113) and is locked by adjusting the handle A (14).

2. The multi-wavelength laser frequency doubling device according to claim 1, characterized in that: The laser frequency doubling unit (12) is 3-4 cm wide, 1-2 cm high, and 1.5-3.5 cm long along the length direction of the base A (11); the laser frequency doubling unit (12) is a frequency doubling crystal block or a transparent closed pool filled with a frequency doubling medium.

3. A multi-wavelength spatial laser modulation device, characterized in that: The invention comprises a fundamental frequency laser (I), a selective frequency doubling mechanism (II) and one or more laser shaping and amplifying mechanisms; when the laser shaping and amplifying mechanisms comprise two or more groups, all the laser shaping and amplifying mechanisms have the same structure, comprising a multi-wavelength laser shaping component (III) and a multi-wavelength laser gain amplifying component (IV); the fundamental frequency laser output by the fundamental frequency laser (I) undergoes selective frequency conversion through the selective frequency doubling mechanism (II), and then undergoes waveform shaping and power amplification through one or more groups of laser shaping and amplifying mechanisms, with the output of the first group of laser shaping and amplifying mechanisms serving as the input of the second group of laser shaping and amplifying mechanisms; The fundamental frequency laser (I) is used to provide fundamental frequency laser light with more than one wavelength; The selective frequency doubling mechanism (II) comprises an optical beam splitter (2), a frequency doubling optical path and a non-frequency doubling optical path located in two output directions after the optical beam splitter (2), and an optical coupler A (3) for coupling the laser light generated by the frequency doubling optical path and the laser light generated by the non-frequency doubling optical path; the frequency doubling optical path comprises the multi-wavelength laser frequency doubling device (1) according to claim 1 or 2 and a first multi-wavelength laser filter (4); the first multi-wavelength laser filter (4) is used to filter the laser light generated by the frequency doubling process of the multi-wavelength laser frequency doubling device (1) to obtain a frequency doubling laser light containing a target wavelength; the fundamental frequency laser light from the fundamental frequency laser (I) is directly transmitted to the optical coupler A (3) via the non-frequency doubling optical path, and is coupled together with the frequency doubling laser light via the optical coupler A (3) to obtain a laser beam containing a laser light of a target wavelength; The multi-wavelength laser shaping component (III) comprises a three-port unidirectional transmitter (5), a multi-wavelength laser waveform shaper (6) and a total reflector (7); the laser beam input into the multi-wavelength laser shaping component (III) enters the multi-wavelength laser waveform shaper (6) via the three-port unidirectional transmitter (5), the target wavelength laser beam in the laser beam is shaped by the multi-wavelength laser waveform shaper (6), the shaped laser beam is reflected by the total reflector (7) and then shaped again by the multi-wavelength laser waveform shaper (6), and the laser beam after the second shaping is input into the multi-wavelength laser gain amplification component (IV) via the three-port unidirectional transmitter (5); The multi-wavelength laser gain amplification component (IV) comprises a multi-wavelength laser gain amplification structure (8) and a second multi-wavelength laser filter (9); the multi-wavelength laser gain amplification structure (8) is used to amplify the power of the target wavelength laser input into the multi-wavelength laser gain amplification component (IV); and the second multi-wavelength laser filter (9) is used to filter the laser beam output by the multi-wavelength laser gain amplification structure (8).

4. The multi-wavelength spatial laser modulation device according to claim 3, wherein: The frequency-doubling optical path and the non-frequency-doubling optical path are respectively provided with optical switches.

5. The multi-wavelength spatial laser modulation device according to claim 3, wherein: The multi-wavelength laser waveform shaper (6) performs Gaussian shaping on laser light with a wavelength range of 280 nm to 2 μm.

6. The multi-wavelength spatial laser modulation device according to claim 3, wherein: The multi-wavelength laser gain amplification structure (8) includes a multi-wavelength laser gain amplification device (81); The multi-wavelength laser gain amplifier device (81) comprises a base B (811) and one or more laser gain units (812); two rows of second mounting grooves (813) parallel to the length direction of the base B (811) are provided on both sides of the base B (811); each row of second mounting grooves (813) comprises two or more coaxially arranged card grooves B, and the card grooves B on the two rows of second mounting grooves (813) are symmetrically arranged; the laser gain unit (812) is installed in the symmetrically arranged card grooves B of the two rows of second mounting grooves (813); each laser gain unit (812) is used to amplify the power of laser light within a specified wavelength range.

7. The multi-wavelength spatial laser modulation device according to claim 6, characterized in that: When the number of laser gain units (812) is more than two, the width and height of all laser gain units (812) perpendicular to the length direction of the base B (811) are the same, and the range is: 3-4 cm in width, 1-2 cm in height, and 1.5-3.5 cm in length along the length direction of the base B (811); the laser gain unit (812) is a gain crystal block or a transparent closed pool filled with a gain medium.

8. The multi-wavelength spatial laser modulation device according to claim 6, wherein: The multi-wavelength laser gain amplification structure (8) is further configured with a pump source (82) adapted to the target wavelength and the same number of optical couplers B (83) as the pump source (82); the laser light emitted by each pump source (82) passes through the corresponding optical coupler B (83) and enters the multi-wavelength laser gain amplification device (81) together with the laser light incident on the multi-wavelength laser gain amplification structure (8) for gain amplification, and then outputs a laser beam containing the target wavelength laser light through the optical collimator (84).

9. The multi-wavelength spatial laser modulation device according to claim 7, wherein: The second mounting groove (813) is composed of baffles B (8131) installed at both ends of the base B (811) in a vertical direction of the length of the base B (811) and one or more partitions B (8132) located between the two baffles B (8131), and a card slot B is formed between adjacent baffles B (8131) and partitions B (8132), or between two adjacent partitions B (8132); the baffles B (8131) and partitions B (8132) are respectively fixedly connected to the base B (811); the heights of the baffles B (8131) and partitions B (8132) are the same or different.

10. The multi-wavelength spatial laser modulation device according to claim 7, wherein: The second mounting groove (813) is composed of baffles B' (8133) installed at both ends of the base B (811) in a vertical direction of the length of the base B (811) and one or more partitions B' (8134) located between the two baffles B' (8133), and a slot B is formed between adjacent baffles B' (8133) and partitions B' (8134), or between two adjacent partitions B' (8134); the baffles B' (8133) and the base B (811) are fixedly or slidably connected, and the partitions B' (8134) and the base B (811) are slidably connected; the heights of the baffles B' (8133) and the partitions B' (8134) above the base B (811) are the same or different.

11. The multi-wavelength spatial laser modulation device according to claim 10, wherein: Both sides of the base B (811) are provided with L-shaped chute B (8111); a scale is marked on the cantilever B (8112) above the L-shaped chute B (8111); the partition B' (8134) is L-shaped as a whole and is slidably installed in the L-shaped chute B (8111); the partition B' (8134) includes a horizontal portion b (81341) and a vertical portion b (81342); the vertical portion b (81342) is provided with a notch b (81343) adapted to the height of the cantilever B (8112); the height of the horizontal portion b (81341) is adapted to the height of the horizontal notch B (8113) of the L-shaped chute B (8111), and the horizontal portion b (81341) extends from the horizontal notch B (8113) and is locked by adjusting the handle B (814).

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