A switchable wavelength laser

Abstract

The application provides a switchable waveband laser, wherein the laser comprises a light source emitting device, a frequency conversion device, a polarization adjustment device and a waveband switching device; seed light emitted by the light source emitting device is sequentially output through the frequency conversion device, the polarization adjustment device and the waveband switching device; wherein the frequency conversion device is used for regulating the frequency of the seed light; the polarization adjustment device is used for adjusting the polarization state of the laser after frequency regulation; the waveband switching device is used for switching the waveband of the laser to output a preset waveband laser, so that at least a single laser can realize full-automatic and arbitrary instant switching between preset waveband lasers.

Description

Technical Field

[0001] This application relates to the field of laser technology, and more particularly to a switchable wavelength laser. Background Technology

[0002] In various laser applications, the absorption rate of different materials is closely related to the wavelength of the laser. Therefore, to achieve better processing results and efficiency, different wavelengths of laser are often required. This is especially true for ultrashort pulse laser processing, where the absorption coefficients of materials vary greatly for different wavelengths of ultrashort pulse laser, resulting in significantly different effects of different wavelengths on the material. Specifically, nonlinear frequency conversion of the fundamental frequency light can be used to achieve the conversion of ultrashort pulse laser wavelengths.

[0003] Because nonlinear optical crystals (hereinafter referred to as nonlinear crystals, crystals, or frequency doubling crystals) possess anisotropy, they are used to perform nonlinear frequency conversion on fundamental light to achieve the conversion of different wavelengths in ultrashort pulse lasers. In related technologies, to adapt to the switching requirements of different processing fields for different wavelength bands, single-wavelength or dual-wavelength design solutions are generally adopted.

[0004] However, the inventors discovered that the dual-wavelength design in related technologies cannot meet the requirement of a single laser to switch arbitrarily between three bands, namely infrared, green, and ultraviolet bands. This leads to the need to repeatedly disassemble and install lasers of different wavelengths for different band requirements, resulting in wasted time and reduced efficiency. Summary of the Invention

[0005] One object of this application is to provide a switchable band laser, which at least satisfies the need to achieve arbitrary switching between preset bands, namely infrared band, green band, and ultraviolet band, using a single laser.

[0006] To achieve the above objectives, some embodiments of this application provide a switchable band laser, the laser including a light source emitting device, a frequency conversion device, a polarization adjustment device, and a band switching device;

[0007] The seed light emitted by the light source emitting device is output after passing through the frequency conversion device, the polarization adjustment device, and the band switching device; wherein...

[0008] The frequency conversion device is used to adjust the frequency of the seed light;

[0009] The polarization adjustment device is used to adjust the direction of the laser after frequency modulation;

[0010] The band switching device is used to switch the band of the laser to output laser light in a preset band.

[0011] Compared to related technologies, the solution provided in this application embodiment enables a single laser to achieve fully automatic and instantaneous switching between three bands: infrared, green, and ultraviolet. This achieves full automation and convenience in laser band switching, meeting the needs of scenarios requiring simultaneous use of different bands. Since there is no need to repeatedly disassemble and install lasers of different wavelengths for different band requirements, it lays the foundation for simultaneous multi-band operation of the laser. This saves actual and space costs in laser manufacturing and improves efficiency. In other words, it solves, to a certain extent, the high cost and coordination problems associated with integrating multiple lasers in related technologies. Moreover, since the wavelengths of each band are different, the solution provided in this application embodiment can adaptively adjust the diffraction limit of different wavelengths to meet different processing linewidth requirements in practical applications. Therefore, the laser has a wider range of applications for processing materials. Attached Figure Description

[0012] Figure 1 An exemplary structural diagram of a switchable band laser provided in an embodiment of this application;

[0013] Figure 2 An exemplary structural diagram of a switchable band laser in an application example provided in this application embodiment;

[0014] Figure 3 A schematic diagram of an exemplary structure of a displacement platform in a band switching device provided in an embodiment of this application;

[0015] Figure 4 A schematic diagram of an exemplary structure of the first frequency doubling crystal mounting disk provided in an embodiment of this application;

[0016] Figure 5 A schematic diagram of an exemplary structure of a displacement platform in another band switching device provided in an embodiment of this application;

[0017] Figure 6 A schematic diagram of an exemplary structure of the second frequency doubling crystal mounting disk provided in an embodiment of this application;

[0018] Figure 7 and Figure 8 These are exemplary structural diagrams of some components of a band switching device provided in an embodiment of this application;

[0019] Figure 9 A schematic diagram of an exemplary structure of a displacement platform in a band switching device provided in an embodiment of this application;

[0020] Figure 10 for Figure 9 Side view. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] The following terms are used in this document.

[0023] Anisotropy refers to the fact that all or part of the chemical, physical, and other properties of a substance change with the direction in which they are directed, exhibiting different properties in different directions.

[0024] Ultrashort pulse lasers, also known as ultrafast lasers, are called Ultrafast Lasers.

[0025] Fundamental frequency light refers to incident laser light.

[0026] Nonlinear optical crystals are crystals that exhibit second-order or higher nonlinear optical effects in response to strong electric fields from lasers. Nonlinear optical crystals are functional materials; frequency-doubling (or "frequency-conversion") crystals can be used to convert the laser wavelength, thereby extending the tunable range of the laser.

[0027] The polarization direction is the direction in which the vibration direction is inconsistent with the propagation direction.

[0028] Linearly polarized light is light whose light vector vibrates in only one fixed direction along the direction of light propagation. This type of light is called plane polarized light. Since the trajectory of the endpoint of the light vector is a straight line, it is also called linearly polarized light.

[0029] Laser collimation uses a laser beam, zone plate, or interferometry to place a point on a straight line or to measure the distance of a point from a straight line.

[0030] A half-wave plate is a birefringent crystal of a certain thickness. When normally incident light passes through it, the phase difference between the ordinary ray and the extraordinary ray is equal to π or an odd multiple thereof. Such a crystal is called a half-wave plate, or simply a half-wave plate.

[0031] Translational motion is the motion in which the straight line connecting any two points on a moving object remains parallel throughout the entire motion.

[0032] A stepper motor, also known as a pulse motor, is a type of electric motor that converts electrical pulse signals into corresponding angular or linear displacement. For each input pulse signal, the rotor rotates by an angle or moves forward one step. The output angular or linear displacement is proportional to the number of input pulses, and the rotational speed is proportional to the pulse frequency.

[0033] Example 1

[0034] This application provides a switchable wavelength laser, such as... Figure 1 As shown, the laser includes a light source emitting device 11, a frequency conversion device 12, a polarization adjustment device 13, and a band switching device 14;

[0035] The seed light emitted by the light source emitting device 11 is output after passing through the frequency conversion device 12, the polarization adjustment device 13, and the band switching device 14; wherein...

[0036] The frequency conversion device 12 is used to adjust the frequency of the seed light;

[0037] The polarization adjustment device 13 is used to adjust the polarization state of the laser after frequency modulation.

[0038] The band switching device 14 is used to switch the band of the laser to output laser in a preset band, which includes infrared band, green light band and ultraviolet band.

[0039] Specifically, the light source emitting device 11 can be a seed source for emitting seed light. Linearly polarized light can be used as the seed light for the entire switchable wavelength band laser.

[0040] In some examples, the light source emitting device 11 can emit linearly polarized fundamental frequency infrared light as the seed light. Using this polarization method facilitates the subsequent frequency conversion device 12 to adjust the frequency of the seed light.

[0041] Specifically, since the energy of the seed light is relatively weak, the frequency conversion device 12 can be used to amplify the energy of the seed light and adjust its frequency, thereby controlling the output of high-energy laser light.

[0042] Specifically, the polarization adjustment device 13 is used to adjust the polarization state of the laser after frequency modulation. This polarization state adjustment may include adjusting the polarization state and collimation of the laser after frequency modulation. By adjusting the direction of the laser after polarization state modulation, the angle of the laser entering the band switching device 14 can be guaranteed.

[0043] Specifically, the band switching device 14 may include a first frequency doubling crystal, a second frequency doubling crystal, and a displacement platform. Simply put, the band switching of the laser is achieved by controlling the displacement or rotation of the second frequency doubling crystal to output laser of a preset band, which includes infrared band, green light band, and ultraviolet band.

[0044] It is not difficult to see that, compared with related technologies, the switchable band laser provided in this application embodiment can achieve fully automatic and instantaneous switching between three bands, namely infrared, green light, and ultraviolet bands, with a single laser. This achieves full automation and convenience in laser band switching, meeting the needs of scenarios requiring simultaneous use of different bands. Since there is no need to repeatedly disassemble and install lasers of different wavelengths for different band requirements, it lays the foundation for simultaneous multi-band operation of the laser, thereby saving actual and space costs and improving efficiency in laser manufacturing. In other words, it solves, to a certain extent, the high cost and coordination problems of integrating multiple lasers together in related technologies. Moreover, since the wavelengths of each band are different, the solution provided in this application embodiment can adaptively adjust the diffraction limit of different wavelengths to meet different processing linewidth requirements in practical applications. Therefore, the laser has a wider range of applications for processing materials.

[0045] Example 2

[0046] In some embodiments of this application, combined with Figure 2 As shown, the frequency conversion device 12 may include a laser amplifier 121 and a laser modulator 122; the seed light passes through the laser amplifier 121 and the laser modulator 122 in sequence before being input to the polarization adjustment device 13.

[0047] The laser amplifier 121 is used to amplify the energy of the seed light;

[0048] The laser modulator 122 is used to control the opening and closing of the seed light after the laser amplifier 121 amplifies the energy of the seed light. The control is mainly reflected in the frequency selection of the seed light to regulate the frequency of the amplified seed light.

[0049] This application provides a specific implementation of a frequency conversion device 12. Other devices that can be used to implement frequency conversion adjustment are also within the protection scope of this application.

[0050] Example 3

[0051] In some embodiments of this application, combined with Figure 2 As shown, the polarization adjustment device 13 may include a half-wave plate 131.

[0052] Furthermore, in some embodiments of this application, the polarization adjustment device 13 may further include a collimation component 132;

[0053] The frequency-modulated laser light passes sequentially through the half-wave plate 131 and the collimation component 132 before being input to the band switching device 14.

[0054] The half-wave plate 131 is used to adjust the polarization direction of the laser.

[0055] The collimation component 132 is used to collimate and adjust the laser after polarization direction adjustment.

[0056] Furthermore, the collimation component 132 may include a first reflector 1321 and a first reflector 1322, which are arranged opposite to each other.

[0057] Specifically, the half-wave plate 131 can be connected to a driving device (not shown in the figure), which can be a motor, such as a stepper motor. The driving device can drive the half-wave plate 131 to rotate 90°, which allows relevant personnel to continuously adjust the polarization direction of the laser after frequency modulation, and achieve precise control of the linear polarization direction of the laser, so as to provide condition matching for the subsequent switching between infrared, green and ultraviolet laser bands.

[0058] It should be noted that in this embodiment, a first reflecting mirror 1321 and a first reflecting mirror 1322 arranged opposite to each other are used to collimate the laser after polarization direction adjustment, providing one specific implementation of the collimation component. This can reduce the size of the laser and improve the convenience of switchable band lasers. It is understood that other components that can be used to achieve collimation adjustment are also within the protection scope of this embodiment.

[0059] Example 4

[0060] In some embodiments of this application, combined with Figure 2 As shown, the band switching device 14 may include a first frequency doubling crystal 21, a second frequency doubling crystal 23, and a displacement platform 22. The displacement platform 22 is used to move the second frequency doubling crystal 23 so that the second frequency doubling crystal 23 is in or away from the target optical path.

[0061] Furthermore, in some embodiments of this application, the half-wave plate 131 is positioned in a first orientation so that the polarization direction of the laser output by the frequency conversion device 12 is a first polarization direction. After the laser is input to the first frequency doubling crystal 21 via the collimating component 132, it emits laser light in the first band with a second polarization direction.

[0062] When the half-wave plate 131 is positioned in the second orientation, the polarization direction of the laser output by the frequency conversion device 12 is changed to the second polarization direction. After the laser is input to the first frequency doubling crystal 21 via the collimating component 132, it emits laser light in the second band with the first polarization direction.

[0063] When the half-wave plate 131 is positioned in the second orientation, the polarization direction of the laser output by the frequency conversion device 12 is changed to the second polarization direction. After the laser is input to the first frequency doubling crystal 21 via the collimating component 132, it is then input to the second frequency doubling crystal 23 located in the target optical path, and then emits laser light in the third band with the second polarization direction.

[0064] The lasers in the first, second, and third bands are respectively infrared, green, and ultraviolet lasers.

[0065] Wherein, the first polarization direction is the vertical polarization direction, and the second polarization direction is the horizontal polarization direction.

[0066] Preferably, the angle between the first orientation and the second orientation is 90°.

[0067] Furthermore, that is, when the half-wave plate 131 is in the first position, so that the polarization direction of the laser output by the frequency conversion device 12 is vertically polarized, the laser is input to the first frequency doubling crystal 21 through the collimating component 132 and then emits a horizontally polarized infrared laser.

[0068] When the half-wave plate 131 is positioned in the second orientation, the polarization direction of the laser output by the frequency conversion device 12 is horizontal. After the laser is input to the first frequency doubling crystal 21 via the collimating component 132, it emits a vertically polarized green light band laser.

[0069] When the half-wave plate 131 is positioned in the second orientation, the polarization direction of the laser output by the frequency conversion device 12 is horizontal. After the laser is collimated by the collimating component 132 and input to the first frequency doubling crystal 21, it is then input to the second frequency doubling crystal 23 located in the target optical path, and then emits laser light in the ultraviolet band with a horizontal polarization direction.

[0070] In some examples, if an infrared laser is required, the operating states of each device are as follows: The light source emitting device 11 emits linearly polarized seed light, which is then frequency-modulated by the laser amplifier 121 and the laser modulator 122. The resulting laser passes through a half-wave plate 131 in the first position, making the polarization direction of the laser vertical. After that, the laser passes through a collimating component 132 composed of a first reflector 1321 and a second reflector 1322 arranged opposite each other to enter the first frequency doubling crystal 21. At this time, the second frequency doubling crystal 23 leaves the target optical path under the action of the displacement platform 22. Thus, the laser output after passing through the first frequency doubling crystal 21 is an infrared laser with a horizontal polarization direction.

[0071] In some cases, if a green light band laser is required, the operating states of each device are as follows: The light source emitting device 11 emits linearly polarized seed light, which is then frequency-modulated by the laser amplifier 121 and the laser modulator 122. The resulting laser passes through a half-wave plate 131 in the second position, i.e., rotated 90° from the first position, so that the polarization direction of the laser is horizontal. After that, the laser passes through a collimating component 132 composed of a first reflector 1321 and a second reflector 1322 arranged opposite each other to enter the first frequency doubling crystal 21. At this time, the second frequency doubling crystal 23 leaves the target optical path under the action of the displacement platform 22. Thus, the laser output after passing through the first frequency doubling crystal 21 is a green light band laser with a vertical polarization direction.

[0072] In some cases, if ultraviolet laser is required, the operating states of each device are as follows: The light source emitting device 11 emits linearly polarized seed light, which is then frequency-modulated by the laser amplifier 121 and the laser modulator 122. The resulting laser passes through the half-wave plate 131 in the second position, making the polarization direction of the laser horizontal. After that, the laser passes through the collimating component 132, which is composed of the first reflector 1321 and the first reflector 1322 arranged opposite to each other, and enters the first frequency doubling crystal 21. At this time, the second frequency doubling crystal 23 is positioned and maintained on the target optical path under the action of the displacement platform 22. Thus, the laser output after passing through the second frequency doubling crystal 23 is ultraviolet laser with a horizontal polarization direction.

[0073] In simple terms, the first frequency doubling crystal 21 doubles the frequency of the laser output from the collimating component 132, thereby generating a green light band laser. The second frequency doubling crystal 23 is used in conjunction with the displacement platform 22. When the displacement platform 22 controls the second frequency doubling crystal 23 to be in the target optical path, the second frequency doubling crystal 23 can perform a frequency combination on the seed light and the laser output from the first frequency doubling crystal 21 to generate an ultraviolet light band laser.

[0074] Example 5

[0075] Embodiment 5 of this application is a further improvement on Embodiment 4.

[0076] In some embodiments of this application, combined with Figure 3 and Figure 4 As shown, the displacement platform 22 may include a motor 31, a first frequency doubling crystal mounting disk 32, and an orientation calibrator 33;

[0077] The output shaft of the motor 31 is coaxially connected to the center of one side of the first frequency doubling crystal mounting disk 32;

[0078] A plurality of first slots 322 are provided at a predetermined position at the center of the first frequency doubling crystal mounting disk 32. The first slots 322 are used to mount the first frequency doubling crystal 21 (not shown in the figure).

[0079] A plurality of positioning holes 321 are provided on the side surface of the first frequency doubling crystal mounting disk 32;

[0080] During use, the stepping amount of the motor 31 and the rotation amount of the first frequency doubling crystal mounting plate 32 are kept synchronized. The orientation calibrator 33 controls the switching of the first frequency doubling crystal by selecting the positioning hole 321 to change the point.

[0081] Specifically, in some embodiments of this application, the half-wave plate 131 is positioned in a first orientation so that the polarization direction of the laser output by the frequency conversion device 12 is vertically polarized. After the laser is input to the first frequency doubling crystal 21 via the collimating component 132, it emits a horizontally polarized infrared laser.

[0082] When the half-wave plate 131 is positioned in the second orientation, the polarization direction of the laser output by the frequency conversion device 12 is horizontal. After the laser is input to the first frequency doubling crystal 21 via the collimating component 132, it emits a vertically polarized green light band laser.

[0083] Preferably, the angle between the first orientation and the second orientation is 90°.

[0084] Furthermore, in some examples, if an infrared laser is required, the operating state of each device is as follows: The light source emitting device 11 emits linearly polarized seed light, which is then frequency-modulated by the laser amplifier 121 and the laser modulator 122. The resulting laser then passes through a half-wave plate 131 in the first position, making the polarization direction of the laser vertical. After that, the laser passes through a collimating component 132 composed of a first reflector 1321 and a first reflector 1322 arranged opposite each other to enter the first frequency doubling crystal 21. Thus, the laser output after passing through the first frequency doubling crystal 21 is an infrared laser with a horizontal polarization direction.

[0085] In some cases, if a green-band laser is required, the operating states of each device are as follows: The light source emitting device 11 emits linearly polarized seed light, which is then frequency-tuned by the laser amplifier 121 and the laser modulator 122. The resulting laser then passes through a half-wave plate 131 in the second position, i.e., rotated 90° from the first position, so that the polarization direction of the laser is horizontal. After that, the laser passes through a collimating component 132 composed of a first reflector 1321 and a first reflector 1322 arranged opposite each other to enter the first frequency doubling crystal 21. Thus, the laser output after passing through the first frequency doubling crystal 21 is a green-band laser with a vertical polarization direction.

[0086] It is not difficult to see that the band switching device 14 provided in this application embodiment can realize arbitrary switching between infrared laser and green light laser. In addition, compared with related technologies, in the solution provided in this application embodiment, the symmetrical design of the structure makes the stepping amount of the motor 31 and the rotation amount of the first frequency doubling crystal mounting disk 32 synchronized, which makes the replacement and use of the first frequency doubling crystal very convenient, greatly improving the service life. It can also meet the specific relationship between the polarization direction of the fundamental frequency light and the cutting azimuth angle of the first frequency doubling crystal, greatly reducing the complexity of the crystal switching device design in the process of laser wavelength conversion. It can realize automatic, efficient and simple crystal switching, which is conducive to reducing costs.

[0087] Furthermore, in some examples, a section with a specific shape on the output shaft of the motor 31 can be used to achieve a coaxial connection with the center of one side of the first frequency doubler crystal mounting disk 32. For example, the center of the first frequency doubler crystal mounting disk 32 can be designed with a hollowed-out portion, which complements the specific shape on the output shaft of the motor 31.

[0088] In some examples, the motor 31 is a stepper motor 31. However, in other examples, the motor 31 may also be other types of motor 31 that rotate synchronously with the first frequency doubling crystal mounting disk 3212, and this application embodiment does not specifically limit this.

[0089] Specifically, the bottom surface of the first slot 322 is perpendicular to the radial direction of the first frequency doubling crystal mounting disk 32.

[0090] Specifically, a number of positioning holes 321 and orientation calibrators 33 are complementaryly arranged on the side surface of the first frequency doubling crystal mounting disk 32.

[0091] In some examples, the orientation calibrator 33 is specifically a positioning shaft, which, together with several positioning holes 321, forms a latching device. Before the first frequency doubling crystal mounting disk 32 rotates, the positioning shaft is first removed. After the first frequency doubling crystal mounting disk 32 has rotated and the orientation of the first frequency doubling crystal is close to the optimal orientation, the positioning shaft is inserted into the corresponding positioning hole 321.

[0092] In some examples, the axial portion of the positioning shaft adopts an isosceles triangle design, which ensures that the positioning shaft is inserted to the bottom, thereby forcibly aligning the position of the first frequency doubling crystal when the positioning shaft is inserted into the corresponding positioning hole 321, ensuring the accuracy of its position.

[0093] In addition, in some examples, such as Figure 4 As shown, the first frequency doubling crystal mounting disk 32 is circular; a plurality of first slots 322 are provided at a predetermined radius of the center of the circular first frequency doubling crystal mounting disk 32, and the bottom surface of the first slots 322 is perpendicular to the radial direction of the circular first frequency doubling crystal mounting disk 32.

[0094] In other examples, the first frequency doubling crystal mounting disk 32 can be a square or rectangular first frequency doubling crystal mounting disk 32.

[0095] In some examples, the overall appearance of the first frequency doubling crystal mounting disk 32 in this embodiment adopts a disc design, which matches the cylindrical design of the output shaft of the motor 31, making the overall device more aesthetically pleasing. By setting a plurality of first slots 322 at a predetermined radius at the center of the circular first frequency doubling crystal mounting disk 32, the characteristic that the distance from the center of a circle to any point on the circumference is equal is fully utilized. Since the bottom surface of the first slot 322 is perpendicular to the radial direction of the circular first frequency doubling crystal mounting disk 32, this arrangement can allow the first frequency doubling crystal to rotate onto the beam path, so that the polarization state of the beam always matches the cutting angle of the first frequency doubling crystal 21.

[0096] Furthermore, it can be understood that the first frequency doubling crystal 21 is easily damaged during use. When one or more of the first frequency doubling crystals are damaged, the undamaged and intact first frequency doubling crystals can be rotated into the beam path by rotating the first frequency doubling crystal mounting plate 32, thereby ensuring that the polarization state of the beam always matches the cutting angle of the first frequency doubling crystal 21, which is beneficial for the accurate calibration of the position of the first frequency doubling crystal 21.

[0097] Example 6

[0098] Embodiment Six of this application is a further improvement on Embodiment Five.

[0099] In some embodiments of this application, the displacement platform 22 may further include a second frequency doubling crystal mounting disk 34, such as... Figure 5 As shown, the second frequency doubling crystal mounting disk 34 is coaxially connected to the center of the other side of the first frequency doubling crystal mounting disk 32;

[0100] like Figure 6 As shown, a plurality of second slots 341 are provided at the predetermined position at the center of the second frequency doubling crystal mounting disk 34. The second slots 341 are used to mount the second frequency doubling crystal. The first frequency doubling crystal and the second frequency doubling crystal are different.

[0101] Preferably, each of the first frequency doubling crystals installed in a plurality of the first slots 322 is identical, and each of the first frequency doubling crystals can output laser light of the same wavelength on the same beam path;

[0102] Each of the second frequency doubling crystals installed in a plurality of second slots 341 is identical. The second frequency doubling crystal and the first frequency doubling crystal cooperate with each other so that the first frequency doubling crystal and the second frequency doubling crystal output laser of the same wavelength on the same beam path.

[0103] Specifically, when the half-wave plate 131 is positioned in the second orientation, the polarization direction of the laser output by the frequency conversion device 12 is horizontal. After the laser passes through the collimating component 132 and is input to the first frequency doubling crystal, it is then input to the second frequency doubling crystal located in the target optical path, where it emits laser light in the ultraviolet band with a horizontal polarization direction.

[0104] In some cases, if ultraviolet laser is required, the operating states of each device are as follows: The light source emitting device 11 emits linearly polarized seed light. The seed light passes through the laser amplifier 121 and the laser modulator 122 in sequence for frequency modulation. The resulting laser passes through the half-wave plate 131 in the second position, making the polarization direction of the laser horizontal. Then, the laser passes through the collimating component 132, which is composed of the first reflector 1321 and the first reflector 1322 arranged opposite each other, and enters the first frequency doubling crystal. At this time, the second frequency doubling crystal and the first frequency doubling crystal cooperate with each other. The first frequency doubling crystal and the second frequency doubling crystal are on the same beam path. Thus, the laser output after passing through the second frequency doubling crystal is ultraviolet laser with a horizontal polarization direction.

[0105] It is not difficult to see that the band switching device 14 provided in this application embodiment can realize arbitrary switching between infrared band laser, green band laser and ultraviolet band laser.

[0106] Specifically, the phrase "the first frequency doubling crystal and the second frequency doubling crystal are different, all the first frequency doubling crystals are the same, and all the second frequency doubling crystals are the same" can mean that the first frequency doubling crystals have the same model and size, the second frequency doubling crystals have the same model and size, and the first frequency doubling crystals and the second frequency doubling crystals have different models and sizes.

[0107] In some examples, the second frequency doubling crystal mounting disk 34 is circular. In other examples, the second frequency doubling crystal mounting disk 34 can be square or rectangular.

[0108] In some examples, the side surface of the second frequency doubling crystal mounting disk 34 may also be provided with a plurality of positioning holes, and an orientation calibrator (not shown in the figure) is used in conjunction with the positioning holes. The orientation calibrator in this embodiment may be the same as the orientation calibrator 33 provided in Embodiment 1, and will not be described again here to avoid repetition.

[0109] Specifically, in this embodiment of the application, the selection and switching of frequency multiplication can be achieved by manually controlling the positional relationship between the second slot 341 of the second frequency multiplier crystal mounting disk 34 and the first slot 322 of the first frequency multiplier crystal mounting disk 32.

[0110] Furthermore, each of the first frequency-doubled crystals, respectively installed in one of the first slots 322, can output a second-harmonic laser of the same wavelength on the same beam path. For example, if there are six first slots 322, then each of the six first slots 322 will have six first frequency-doubled crystals of the same size and model installed. By rotating the first frequency-doubled crystal mounting plate 32 and thus rotating the first frequency-doubled crystals, these six first frequency-doubled crystals can output a second-harmonic laser of the same wavelength on the same beam path. The second-harmonic laser mentioned here can be a second-harmonic laser with a wavelength of 532 nm.

[0111] Similarly, the second frequency-doubled crystal and the first frequency-doubled crystal, respectively installed in several second slots 341, cooperate with each other to enable the first frequency-doubled crystal and the second frequency-doubled crystal to output third-harmonic laser light of the same wavelength on the same beam path. Here, the third-harmonic laser light can be a third-harmonic laser with a wavelength of 355 nm.

[0112] In some examples, a number of the first slots 322 and a number of the second slots 341 are set in equal proportions.

[0113] In some other examples, to meet personalized and diverse needs, the first slots 322 and the second slots 341 may not be set in equal proportions, but the first slots 322 and the second slots 341 must be set in corresponding proportions, that is, the setting ratio of the first slots 322 and the setting ratio of the second slots 341 are the same.

[0114] Specifically, assuming there are 6 first slots 322, one first slot 322 can be set every 60°; assuming there are 10 first slots 322, one first slot 322 can be set every 36°. Similarly, the second slot 341 is set in the same way, which will not be elaborated here.

[0115] Example 7

[0116] Embodiment 7 of this application is a further improvement on Embodiment 6.

[0117] In some embodiments of this application, the second frequency doubling crystal mounting disk 34 is coaxially connected to the center of the other side of the first frequency doubling crystal mounting disk 32 via a rotating component 35.

[0118] Combination Figure 5 As shown, the rotating component 35 includes a magnetic suction component 351; in this embodiment, the magnetic suction force of the magnetic suction component 351 controls the positional relationship between the second slot of the second frequency doubling crystal mounting disk 34 and the first slot 322 of the first frequency doubling crystal mounting disk 32.

[0119] In practical applications, the magnetic attraction force of the magnetic component 3511 can be controlled by a pre-set program, which helps to save manpower.

[0120] Example 8

[0121] Embodiment 8 of this application is a further improvement on Embodiment 7.

[0122] In some embodiments of this application, the first slot 322 is a crystal holder; the second slot 341 includes a crystal holder 3411 and a lens holder 3412, and a lens holder 3412 is fixedly disposed between each pair of crystal holders 3411.

[0123] Combination Figure 7 and Figure 8 As shown, the rotating component 35 may also include a main shaft 352, and the magnetic attracting component 351 includes an electromagnet 3511 and an iron ball 3512;

[0124] The main shaft 352 is fixedly equipped with an iron ball 3512 and a pair of electromagnets 3511. Only one of each pair of electromagnets 3511 is energized at any given time to generate magnetic attraction. The angle at which the iron ball 3512 swings between the two electromagnets 3511 is the interval angle between the lens seat and the crystal seat.

[0125] In some examples, a lens is disposed within the lens mount, or the lens mount is a through hole.

[0126] Those skilled in the art will understand that, in practical applications, the first slot 322 is a crystal mount, and the crystal mount can only correspond to the crystal mount or lens mount at the same position on the second frequency doubling crystal mounting plate 34.

[0127] In some examples, the rotating component 35 may also include a connecting shaft 353, wherein the center of the second frequency doubling crystal mounting disk 34 and the center of the first frequency doubling crystal mounting disk 32 are coaxially connected through the connecting shaft 353 of the rotating component 35;

[0128] Specifically, electromagnets 3511 can be arranged in pairs along the axial direction of the connecting shaft 353. Iron balls 3512 and pairs of electromagnets 3511 are fixedly mounted on the main shaft 352. Only one electromagnet in each pair can be energized at any given time to generate magnetic attraction. In other words, in this embodiment, the rotating component 35 controls the crystal seat or lens mount on the second frequency doubling crystal mounting disk 34 to correspond with the crystal seat on the first frequency doubling crystal mounting disk 32 by the attraction of the iron balls 3512 by the electromagnets 3511.

[0129] In some examples, when the iron ball 3512 is attracted to an electromagnet 3511, the crystal mounts of the first frequency doubling crystal mounting disk 32 and the second frequency doubling crystal mounting disk 34 are at the same horizontal position; when the iron ball 3512 is attracted to another electromagnet 3511, the lens mounts of the first frequency doubling crystal mounting disk 32 and the second frequency doubling crystal mounting disk 34 are at the same horizontal position.

[0130] It is understandable that when the crystal mounts of the first frequency doubling crystal mounting disk 32 and the second frequency doubling crystal mounting disk 34 are at the same horizontal position, there are two crystal mounts in total, and the optical path is in the third frequency doubling state.

[0131] Example 9

[0132] The above embodiments one to three and five to seven can be used in combination.

[0133] This application provides a specific application example of a displacement platform in a band switching device, such as... Figure 9 and Figure 10 As shown. The displacement platform includes a stepper motor, a first frequency-doubled crystal mounting disk, an orientation calibrator (not shown in the figure), and a second frequency-doubled crystal mounting disk.

[0134] The stepper motor's output shaft has a specially shaped section for connecting with the first frequency multiplier crystal mounting plate, ensuring synchronization between the stepper motor's stepping speed and the first frequency multiplier crystal mounting plate's rotation speed, with a constant rotation angle ratio. The first frequency multiplier crystal mounting plate has a circular design with a hollow center, the hollow shape complementing the specific shape on the stepper motor's output shaft. Additionally, at a certain radius on the first frequency multiplier crystal mounting plate, there are first slots for mounting the first frequency multiplier crystal, the bottom surface of which is perpendicular to the radial direction of the circular first frequency multiplier crystal mounting plate. The orientation calibrator and the positioning holes on the first frequency multiplier crystal mounting plate form a complementary pin device. Before the first frequency multiplier crystal mounting plate rotates, the orientation calibrator is first withdrawn. After the first frequency multiplier crystal mounting plate has rotated and the first frequency multiplier crystal's orientation is close to the optimal orientation, the orientation calibrator is inserted into the positioning holes of the nonlinear first frequency multiplier crystal mounting plate.

[0135] Furthermore, this application embodiment includes a second frequency-doubled crystal mounting disk, which is coaxially connected to the first frequency-doubled crystal mounting disk via a rotating component. Each crystal holder at a different position on the second frequency-doubled crystal mounting disk can only correspond to a crystal holder or lens holder at the same position on the second frequency-doubled crystal mounting disk.

[0136] The flowcharts or block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of devices, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-specific system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0137] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within this application. No reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices recited in the apparatus claims may also be implemented by a single unit or device in software or hardware. The terms "first," "second," etc., are used to indicate names and do not indicate any particular order.

Claims

1. A switchable-band laser, characterized in that, The laser includes a light source emitting device, a frequency conversion device, a polarization adjustment device, and a band switching device; The seed light emitted by the light source emitting device is sequentially passed through the frequency conversion device, the polarization adjustment device, and the band switching device before being output; wherein... The frequency conversion device is used to adjust the frequency of the seed light; The polarization adjustment device is used to adjust the polarization state of the laser after frequency modulation. The band switching device is used to switch the band of the laser to output laser of a preset band. The polarization adjustment device includes a half-wave plate, which is used to adjust the polarization direction of the laser. The band switching device includes a first frequency doubling crystal, a second frequency doubling crystal, and a displacement platform. The displacement platform is used to move the second frequency doubling crystal so that the second frequency doubling crystal is in or away from the target optical path. The displacement platform includes a first frequency doubling crystal mounting plate and a second frequency doubling crystal mounting plate. A plurality of first slots are provided at a predetermined position at the center of the first frequency doubling crystal mounting plate. The first slots are used to mount the first frequency doubling crystal. The second frequency multiplier crystal mounting disk is coaxially connected to the center of the other side of the first frequency multiplier crystal mounting disk. A plurality of second slots are provided at the predetermined position at the center of the second frequency multiplier crystal mounting disk. The second slots are used to install the second frequency multiplier crystal. The first frequency multiplier crystal and the second frequency multiplier crystal are different. The first slot is a crystal mount, and the second slot includes a crystal mount and a lens mount. A lens mount is fixedly disposed between each pair of crystal mounts. The crystal mount of the first frequency doubling crystal mounting disk corresponds to the crystal mount or lens mount at the same position on the second frequency doubling crystal mounting disk. When the crystal mounts of the first frequency-doubled crystal mounting disk and the second frequency-doubled crystal mounting disk are at the same horizontal position, there are two crystal mounts in total, and the optical path is in a tripled frequency state; When the half-wave plate is positioned in the first orientation, the polarization direction of the laser output by the frequency conversion device is the first polarization direction. After the laser is input to the first frequency doubling crystal, it emits laser light in the first band with the second polarization direction. The first band is the infrared band. When the half-wave plate is positioned in the second orientation, the polarization direction of the laser output by the frequency conversion device is changed to the second polarization direction. After the laser is input to the first frequency doubling crystal, it emits laser light in the second band with the first polarization direction. The second band is the green light band. When the half-wave plate is positioned in the second orientation, the polarization direction of the laser output by the frequency conversion device is changed to the second polarization direction. After the laser is input to the first frequency doubling crystal, it is then input to the second frequency doubling crystal located in the target optical path, and then emits laser light in the third band with the second polarization direction. The third band is the ultraviolet band.

2. The laser according to claim 1, characterized in that, The frequency conversion device includes a laser amplifier and a laser modulator; The seed light passes sequentially through the laser amplifier and the laser modulator before being input to the polarization adjustment device; wherein... The laser amplifier is used to amplify the energy of the seed light; The laser modulator is used to control the switching on and off of the seed light after the laser amplifier amplifies the energy of the seed light, so as to regulate the frequency of the amplified seed light.

3. The laser according to claim 1, characterized in that, The polarization adjustment device also includes a collimation component; The frequency-modulated laser passes sequentially through the half-wave plate and the collimation component before being input to the band switching device. The collimation component is used to collimate and adjust the laser after polarization direction adjustment. The collimation component includes a first reflector and a second reflector, which are arranged opposite to each other.

4. The laser according to claim 1, characterized in that, The angle between the first orientation and the second orientation is 90°.

5. The laser according to claim 1, characterized in that, The displacement platform includes a motor and an orientation calibrator; The output shaft of the motor is coaxially connected to the center of one side of the first frequency doubling crystal mounting disk; A plurality of positioning holes are provided on the side surface of the first frequency doubling crystal mounting disk; During use, the stepping amount of the motor and the rotation amount of the first frequency doubling crystal mounting plate are kept synchronized. The orientation calibrator controls the switching of the first frequency doubling crystal by selecting the positioning hole to change the point.

6. The laser according to claim 1, characterized in that, Each of the first frequency doubling crystals installed in several of the first slots is identical, and each first frequency doubling crystal can output laser light of the same wavelength on the same beam path; Each of the second frequency doubling crystals installed in several second slots is identical. The second frequency doubling crystal and the first frequency doubling crystal cooperate with each other so that the first frequency doubling crystal and the second frequency doubling crystal output laser of the same wavelength on the same beam path.

7. The laser according to claim 6, characterized in that, The second frequency doubling crystal mounting disk is coaxially connected to the center of the other side of the first frequency doubling crystal mounting disk via a rotating component, the rotating component including a magnetic suction element; The magnetic attraction force of the magnetic component controls the positional relationship between the second slot of the second frequency doubler crystal mounting disk and the first slot of the first frequency doubler crystal mounting disk.

8. The laser according to claim 7, characterized in that, The rotating component also includes a main shaft, and the magnetic attracting component includes an electromagnet and an iron ball; An iron ball and a pair of electromagnets are fixedly mounted on the main shaft. Only one of the electromagnets in each pair is energized at any given time to generate magnetic attraction. The angle at which the iron ball swings between the two electromagnets is the interval angle between the lens mount and the crystal mount.

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