Device for synchronously carrying out optical fiber laser spectrum synthesis and coherent synthesis
By designing a device that synchronizes spectral synthesis and coherent synthesis in fiber laser, spectral synthesis and coherent synthesis are used to use multiple narrow linewidth seed laser sources and optical components to perform spectral synthesis and coherent synthesis, the high-power fiber laser output and dispersion devices are solved to withstand high output power Problem, high power output and synchronous control are achieved.
Patent Information
- Application Number
- CN202421046142.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-14
AI Technical Summary
It is difficult to achieve the output of high-power fiber lasers in the prior art, and when coherent synthesis and incoherent synthesis are combined, dispersive devices withstand high output power, which has design problems.
Design a device for synchronous synthesis of fiber laser spectral synthesis and coherent synthesis, pre-amplification and beam splitting through multiple narrow line-width seed laser sources of different wavelengths, and a phase modulator, fiber delay line and laser amplifier are set on the transmission path. Spectral synthesis is performed using dichroic mirrors, full mirrors and semi-transparent half mirrors, and coherent synthesis is achieved in combination with closed-loop feedback phase control.
The spectral synthesis of high-power narrow linewidth fiber laser is achieved synchronously with coherent synthesis, which improves the output power of fiber laser and avoids the risk of dispersed devices with high output power.
Smart Images
Figure CN222261723U_ABST
Abstract
Description
Technical Field
[0001] The utility model mainly relates to the technical field of high-power narrow-linewidth optical fiber laser spectrum synthesis and coherent synthesis, in particular to an optical fiber laser spectrum synthesis and coherent synthesis synchronous device. Background Art
[0002] Fiber lasers have been widely used due to their advantages such as good beam quality, high conversion efficiency, and convenient thermal management. In order to obtain higher-power fiber lasers, synthesizing multiple fiber lasers is one of the effective methods. Common beam synthesis methods are incoherent synthesis and coherent synthesis. Among them, active phase-controlled coherent synthesis achieves in-phase output of each output laser by applying phase control to each sub-beam with the same wavelength. Incoherent synthesis has no specific requirements for the wavelength, line width, phase, etc. of each sub-beam. Theory and implementation have proved that coherent synthesis is a beam synthesis method with obvious advantages. At present, an output power of more than 10,000 watts has been achieved through active phase-controlled coherent synthesis. If coherent synthesis is combined with incoherent synthesis horizontally, the output power of fiber lasers can be further improved.
[0003] To combine coherent synthesis with incoherent synthesis, it is necessary to design and differentiate the wavelengths between the coherent synthesis modules. Therefore, combining the spectral synthesis technology in incoherent synthesis with coherent synthesis is an effective way. Spectral synthesis is to overlap sub-beams of different wavelengths in space through dispersive devices. Dispersive devices are the core components of spectral synthesis, and their power-bearing performance is often not as good as that of spatial beam-combining devices used for coherent synthesis. Therefore, it is necessary to design a suitable method for simultaneous high-power narrow-linewidth fiber laser spectral synthesis and coherent synthesis, so as to realize spectral synthesis first and then coherent synthesis, and avoid the dispersive device as the last-stage beam-combining device directly bearing high output power. Utility Model Content
[0004] In view of the technical problems existing in the prior art, the utility model proposes a device for simultaneously performing optical fiber laser spectrum synthesis and coherent synthesis.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0006] On the one hand, the utility model provides a device for synchronously performing optical fiber laser spectrum synthesis and coherent synthesis, comprising:
[0007] A beam generating unit, comprising N seed laser sources with different central wavelengths, each sub-laser source corresponds to a 1×M laser beam splitter, each 1×M laser beam splitter evenly splits the narrow linewidth seed light output by the corresponding seed laser source into M sub-beams, and each sub-beam transmission path is provided with at least a phase modulator, a laser amplifier and a fiber collimator;
[0008] The spectral synthesis unit is used to take the m-th collimated output sub-beam corresponding to the narrow linewidth seed light of different central wavelengths as a group, spectrally synthesize the M groups of sub-beams each having N different wavelengths, and combine the M groups of spectrally synthesized lasers to output a final spectrally synthesized beam, wherein m=1, 2, ..., M.
[0009] Further, the wavelength interval between the N narrow line width seed lights with different central wavelengths is greater than 1 nm. Preferably, the wavelength interval between the N narrow line width seed lights with different central wavelengths is 4 nm or greater.
[0010] Furthermore, in the light beam generating unit, a fiber delay line is also provided on the transmission path of each light beam.
[0011] Furthermore, the beam generating unit further includes N preamplifiers, one preamplifier corresponds to one seed laser source, and the narrow linewidth seed lights output by various sub-laser sources are power-amplified by the corresponding preamplifiers and then input into the corresponding 1×M laser beam splitters.
[0012] Furthermore, the spectrum synthesis unit includes (N-1)×M dichroic mirrors, 1 total reflection mirror and M-1 semi-transparent and semi-reflective mirrors, wherein N-1 dichroic mirrors form a group, with a total of M groups of dichroic mirrors, the first dichroic mirror in the mth group of dichroic mirrors combines the mth collimated output sub-beam corresponding to the first narrow linewidth seed light and the mth collimated output sub-beam corresponding to the second narrow linewidth seed light into one beam, the second dichroic mirror in the mth group of dichroic mirrors combines the beam output by the first dichroic mirror in the mth group of dichroic mirrors with the beam output by the second dichroic mirror in the mth group of dichroic mirrors. The sub-beams of the m-th collimated output corresponding to the third narrow linewidth seed light are combined into one beam, the third dichroic mirror in the m-th group of dichroic mirrors combines the beam output by the second dichroic mirror in the m-th group of dichroic mirrors and the sub-beam of the m-th collimated output corresponding to the fourth narrow linewidth seed light into one beam, and so on, the N-1-th dichroic mirror in the m-th group of dichroic mirrors combines the beam output by the N-2-th dichroic mirror in the m-th group of dichroic mirrors and the sub-beam of the m-th collimated output corresponding to the N-th narrow linewidth seed light into one beam and then outputs it; The output light path of the N-1th dichroic mirror in the first group of dichroic mirrors is provided with a total reflection mirror, the output light path of the N-1th dichroic mirror in the second group of dichroic mirrors is provided with the first semi-transparent and semi-reflective mirror, the output light path of the N-1th dichroic mirror in the third group of dichroic mirrors is provided with the second semi-transparent and semi-reflective mirror, and so on, the output light path of the N-1th dichroic mirror in the M group of dichroic mirrors is provided with the M-1th semi-transparent and semi-reflective mirror; the first semi-transparent and semi-reflective mirror is provided on the reflection light path of the total reflection mirror, and the total reflection mirror reflects the 1st The spectrally synthesized laser output by the N-1th dichroic mirror in the dichroic mirror group is reflected to the first semi-transparent and semi-reflective mirror; a combined light beam output by the first semi-transparent and semi-reflective mirror is incident on the second semi-transparent and semi-reflective mirror, a combined light beam output by the second semi-transparent and semi-reflective mirror is incident on the third semi-transparent and semi-reflective mirror, and so on, a combined light beam output by the M-2th semi-transparent and semi-reflective mirror is incident on the M-1th semi-transparent and semi-reflective mirror, and a combined light beam output by the M-1th semi-transparent and semi-reflective mirror is output as the final spectrally synthesized light beam.
[0013] Furthermore, the device for synchronously performing optical fiber laser spectrum synthesis and coherent synthesis provided by the utility model also includes a phase control unit, and the phase control unit is connected to each phase modulator.
[0014] Further, the phase control unit is a closed-loop feedback phase control unit, including M-1 high-reflection mirrors, M-1 baffles, M-1 photodetectors and 1 phase controller;
[0015] Another combined light beam outputted by the first semi-transparent and semi-reflective mirror is incident on the first high-reflective mirror, another combined light beam outputted by the second semi-transparent and semi-reflective mirror is incident on the second high-reflective mirror, and so on, another combined light beam outputted by the M-1th semi-transparent and semi-reflective mirror is incident on the M-1th high-reflective mirror, a baffle is respectively provided on the reflected light path of each high-reflective mirror, and a photoelectric detector is respectively provided on the transmitted light path of each high-reflective mirror;
[0016] M-1 photodetectors are all connected to the phase controller, and the phase controller is connected to each phase modulator.
[0017] Furthermore, the optical fiber laser spectral synthesis and coherent synthesis simultaneous device provided by the utility model also includes a spot shape recording unit, including a focusing lens and a camera, which collects a part of the final output spectral synthesis light beam and focuses it into the camera using the focusing lens.
[0018] The device for simultaneously performing optical fiber laser spectral synthesis and coherent synthesis provided by the utility model also includes a synthesis effect monitoring unit, including an Mth photoelectric detector and an oscilloscope, which collects a part of the final output spectral synthesis light beam to the Mth photoelectric detector, and the Mth photoelectric detector receives the light intensity signal and displays the record in the oscilloscope.
[0019] The beneficial effects of the utility model are:
[0020] The utility model provides a scheme for simultaneous spectrum synthesis and coherent synthesis of high-power narrow-linewidth fiber lasers, which pre-amplifies and splits narrow-linewidth seeds of multiple different wavelengths, and collimates and outputs the sub-beams of different wavelengths after the splitting after phase modulation, optical path difference compensation, power amplification and other processing. Take the m-th collimated output sub-beam corresponding to the narrow-linewidth seed light of different central wavelengths as a group, and each of the M groups has N sub-beams of different wavelengths for spectrum synthesis, and then combine the lasers after the spectrum synthesis of the M groups for output. At the same time, collect a small part of the power of the combined output laser, use a photoelectric detector and a phase controller to realize the phase control of each sub-beam of the same wavelength and then realize coherent synthesis, and finally realize the synchronization of spectrum synthesis and coherent synthesis, and improve the output power of the fiber laser. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0022] Figure 1 This is a schematic diagram of the structure of a device for simultaneously performing optical fiber laser spectral synthesis and coherent synthesis provided by an embodiment;
[0023] Numbers in the figure:
[0024] 1-1, the first seed laser source 1-1, 1-2, the second seed laser source, ..., 1-N, the Nth seed laser source 1-N;
[0025] 2. Pre-amplifier; 3. Laser beam splitter; 4. Phase modulator; 5. Fiber delay line; 6. Laser amplifier; 7. Laser collimator; 8. Dichroic mirror; 9. Totally reflective mirror; 10. Semi-transparent and semi-reflective mirror; 11. Highly reflective mirror; 12. Focusing lens; 13. Camera; 14. Photodetector; 15. Oscilloscope; 16. Baffle; 17. Phase controller. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] In one embodiment, a device for simultaneously performing optical fiber laser spectral synthesis and coherent synthesis is provided, comprising:
[0028] A beam generating unit, comprising N seed laser sources with different central wavelengths, each sub-laser source corresponds to a 1×M laser beam splitter, each 1×M laser beam splitter evenly splits the narrow linewidth seed light output by the corresponding seed laser source into M sub-beams, and each sub-beam transmission path is provided with at least a phase modulator, a laser amplifier and a fiber collimator;
[0029] The spectral synthesis unit is used to take the m-th collimated output sub-beam corresponding to the narrow linewidth seed light of different central wavelengths as a group, spectrally synthesize the M groups of sub-beams each having N different wavelengths, and combine the M groups of spectrally synthesized lasers to output a final spectrally synthesized beam, wherein m=1, 2, ..., M.
[0030] The wavelength interval between the N narrow line width seed lights with different central wavelengths is greater than 1 nm. Preferably, the wavelength interval between the N narrow line width seed lights with different central wavelengths is 4 nm or greater.
[0031] Reference Figure 1 An embodiment provides a device for synchronously performing optical fiber laser spectrum synthesis and coherent synthesis, including a beam generating unit and a spectrum synthesis unit. The specific scheme is as follows:
[0032] The light beam generating unit comprises:
[0033] N seed laser sources with different central wavelengths are respectively the first seed laser source 1-1, the second seed laser source 1-2, ..., the Nth seed laser source 1-N, the first seed laser source 1-1, the second seed laser source 1-2, ..., the Nth seed laser source 1-N, and the wavelengths of the first seed laser source 1-1, the second seed laser source 1-2, ..., the Nth seed laser source 1-N are respectively λ1~λ N , N seed laser sources with different central wavelengths are used to generate N narrow-linewidth seed lights with different central wavelengths.
[0034] The output ends of N preamplifiers 2, the first seed laser source 1-1, the second seed laser source 1-2, ..., the Nth seed laser source 1-N are respectively connected to an input port of a preamplifier, and the output port of each preamplifier 2 is connected to the 0th port of the corresponding 1×M laser beam splitter 3. The N preamplifiers 2 are used to pre-amplify the power of N narrow linewidth seed lights with different central wavelengths.
[0035] N 1×M laser beam splitters 3, one 1×M laser beam splitter 2 corresponds to one seed laser source, and are used to split N narrow linewidth seed lights of different central wavelengths after power pre-amplification, and each narrow linewidth seed light is evenly divided into M sub-beams.
[0036] N×M phase modulators 4, M phase modulators 4 form a group, and there are N groups of phase modulators in total. One group of phase modulators corresponds to one seed laser source, and is used to phase modulate each sub-beam from the nth narrow linewidth seed light beam, and change the piston phase of each sub-beam laser; further, each phase modulator 4 is connected to a phase control unit. The phase control unit controls each generated phase control signal of N×M phase modulators, realizes the phase control of each sub-beam of the same wavelength, and then realizes coherent synthesis.
[0037] There are N×M optical fiber delay lines 5, M optical fiber delay lines 5 form a group, and there are N groups of optical fiber delay lines in total. One group of optical fiber delay lines corresponds to one seed laser source, which is used to compensate for the optical path difference of each sub-beam split from the nth narrow linewidth seed light.
[0038] There are N×M laser amplifiers 6, M laser amplifiers 6 form a group, and there are N groups of laser amplifiers in total. One group of laser amplifiers corresponds to one seed laser source, and is used to amplify the power of each sub-beam split from the nth narrow linewidth seed light.
[0039] N×M laser collimators 7, M laser collimators 7 form a group, and there are N groups of laser collimators in total. One group of laser collimators corresponds to one seed laser source, and is used to collimate and output each sub-beam split from the nth narrow linewidth seed light.
[0040] The spectrum synthesis unit includes (N-1)×M dichroic mirrors 8, 1 total reflection mirror 9 and M-1 semi-transparent and semi-reflective mirrors 10;
[0041] N-1 dichroic mirrors 8 form a group, with a total of M groups of dichroic mirrors; the first dichroic mirror in the m-th group of dichroic mirrors combines the sub-beam of the m-th collimated output corresponding to the first narrow linewidth seed light and the sub-beam of the m-th collimated output corresponding to the second narrow linewidth seed light into one beam, and the second dichroic mirror in the m-th group of dichroic mirrors combines the beam output by the first dichroic mirror in the m-th group of dichroic mirrors with the sub-beam of the m-th collimated output corresponding to the third narrow linewidth seed light. The light beams are combined into one beam, the third dichroic mirror in the mth group of dichroic mirrors combines the light beam output by the second dichroic mirror in the mth group of dichroic mirrors and the mth collimated output sub-beam corresponding to the fourth narrow linewidth seed light into one beam, and so on, the N-1th dichroic mirror in the mth group of dichroic mirrors combines the light beam output by the N-2th dichroic mirror in the mth group of dichroic mirrors and the mth collimated output sub-beam corresponding to the Nth narrow linewidth seed light into one beam and then outputs it.
[0042] A total reflective mirror 9 is arranged on the output light path of the N-1th dichroic mirror in the first group of dichroic mirrors, a first semi-transparent semi-reflective mirror 10 is arranged on the output light path of the N-1th dichroic mirror in the second group of dichroic mirrors, a second semi-transparent semi-reflective mirror 10 is arranged on the output light path of the N-1th dichroic mirror in the third group of dichroic mirrors, and so on, an M-1th semi-transparent semi-reflective mirror 10 is arranged on the output light path of the N-1th dichroic mirror in the M group of dichroic mirrors;
[0043] The first semi-transparent and semi-reflective mirror 10 is arranged on the reflection light path of the total reflective mirror 9, and the total reflective mirror 9 reflects the laser light after spectrum synthesis output by the N-1th dichroic mirror in the first group of dichroic mirrors to the first semi-transparent and semi-reflective mirror 10;
[0044] The combined light beam output by the first semi-transparent and semi-reflective mirror 10 is incident on the second semi-transparent and semi-reflective mirror, the combined light beam output by the second semi-transparent and semi-reflective mirror 10 is incident on the third semi-transparent and semi-reflective mirror 10, and so on. The combined light beam output by the M-2th semi-transparent and semi-reflective mirror is incident on the M-1th semi-transparent and semi-reflective mirror 10, and the combined light beam output by the M-1th semi-transparent and semi-reflective mirror 10 is output as the final spectral synthetic light beam.
[0045] The phase control unit in this embodiment is a closed-loop feedback phase control unit, including M-1 high-reflection mirrors 11, M-1 baffles 16, M-1 photodetectors 14 and 1 phase controller 17;
[0046] Another combined light beam outputted by the first semi-transparent and semi-reflective mirror 10 is incident on the first high-reflective mirror 11, another combined light beam outputted by the second semi-transparent and semi-reflective mirror 10 is incident on the second high-reflective mirror 11, and so on, another combined light beam outputted by the M-1th semi-transparent and semi-reflective mirror 10 is incident on the M-1th high-reflective mirror 11, a baffle 16 is respectively provided on the reflected light path of the first high-reflective mirror 11 to the M-1th high-reflective mirror 11, and a photoelectric detector 14 is respectively provided on the transmitted light path of each high-reflective mirror 11;
[0047] The M-1 photodetectors 14 are all connected to the phase controller 17, and the phase controller is connected to each phase modulator.
[0048] As a preferred solution, the phase control method in this embodiment adopts the feedback control method commonly used in the art. The phase controller 17 runs a phase control algorithm pre-loaded thereon that is well-known or commonly used in the art (including but not limited to the jitter method well-known in the art, the random parallel gradient descent method, etc.). The phase controller 17 is used to generate phase control signals for N×M phase modulators, thereby achieving phase control of each sub-beam of the same wavelength and thereby achieving coherent synthesis.
[0049] In the above description, a combined light beam outputted by the M-1th semi-transparent and semi-reflective mirror 10 is outputted as the final spectral synthesis light beam. Furthermore, an M-th high-reflective mirror 11 is arranged on the transmission optical path of the final spectral synthesis light beam outputted by the M-1th semi-transparent and semi-reflective mirror 10. Most of the laser power is reflected into the free space by the M-th high-reflective mirror 11, and another small part of the laser power is transmitted to the M-th semi-transparent and semi-reflective mirror 10 by the M-th high-reflective mirror 11, and is divided into two laser beams by the M-th semi-transparent and semi-reflective mirror 10, one of which is used as the incident light of the spot morphology recording unit. The spot morphology recording unit includes a focusing lens 12 and a camera 13, and the focusing lens 12 is used to focus the light beam into the camera 13 for observing and recording the spot morphology. The focusing lens 12 is used to focus the light beam into the camera 13, so as to facilitate the observation and recording of the spot morphology. Another laser beam output by the Mth semi-transparent and semi-reflective mirror 10 serves as the incident light of the synthesis effect monitoring unit. The synthesis effect monitoring unit includes the Mth photodetector 14 and the oscilloscope 15. A part of the final output spectral synthesis light beam is collected to the Mth photodetector 14. The Mth photodetector 14 receives the light intensity signal and displays and records it in the oscilloscope 15 for evaluating the synthesis effect.
[0050] Matters not covered in this utility model are known technologies.
[0051] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0052] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.
[0053] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A device for simultaneous optical fiber laser spectrum synthesis and coherent synthesis, characterized in that: include: A beam generating unit, comprising N seed laser sources with different central wavelengths, each sub-laser source corresponds to a 1×M laser beam splitter, each 1×M laser beam splitter evenly splits the narrow linewidth seed light output by the corresponding seed laser source into M sub-beams, and each sub-beam transmission path is provided with at least a phase modulator, a laser amplifier and a fiber collimator; The spectral synthesis unit is used to take the m-th collimated output sub-beam corresponding to the narrow linewidth seed light of different central wavelengths as a group, spectrally synthesize the M groups of sub-beams each having N different wavelengths, and combine the M groups of spectrally synthesized lasers to output a final spectrally synthesized beam, wherein m=1, 2, ..., M.
2. The device for simultaneous optical fiber laser spectrum synthesis and coherent synthesis according to claim 1, characterized in that: The wavelength interval between the N narrow linewidth seed lights with different central wavelengths is greater than 1 nm.
3. The device for simultaneous optical fiber laser spectrum synthesis and coherent synthesis according to claim 2, characterized in that: The wavelength interval between the N narrow linewidth seed lights with different central wavelengths is 4 nm or more.
4. The device for simultaneous optical fiber laser spectrum synthesis and coherent synthesis according to claim 1, 2 or 3, characterized in that: In the light beam generating unit, an optical fiber delay line is also arranged on the transmission path of each light beam.
5. The device for simultaneous optical fiber laser spectrum synthesis and coherent synthesis according to claim 4, characterized in that: The beam generating unit further includes N preamplifiers, one preamplifier corresponds to one seed laser source, and the narrow linewidth seed lights output by various sub-laser sources are power-amplified by the corresponding preamplifiers and then input into the corresponding 1×M laser beam splitters.
6. The device for simultaneous optical fiber laser spectrum synthesis and coherent synthesis according to claim 1, 2, 3 or 5, characterized in that: The spectrum synthesis unit comprises (N-1)×M dichroic mirrors, 1 total reflection mirror and M-1 semi-transparent and semi-reflective mirrors, wherein N-1 dichroic mirrors form a group, with a total of M groups of dichroic mirrors, the first dichroic mirror in the mth group of dichroic mirrors combines the mth collimated output sub-beam corresponding to the first narrow line width seed light and the mth collimated output sub-beam corresponding to the second narrow line width seed light into one beam, the second dichroic mirror in the mth group of dichroic mirrors combines the beam output by the first dichroic mirror in the mth group of dichroic mirrors with the beam output by the third dichroic mirror. The sub-beams of the m-th collimated output corresponding to the narrow linewidth seed light are combined into one beam, the third dichroic mirror in the m-th group of dichroic mirrors combines the beam output by the second dichroic mirror in the m-th group of dichroic mirrors and the sub-beam of the m-th collimated output corresponding to the fourth narrow linewidth seed light into one beam, and so on, the N-1-th dichroic mirror in the m-th group of dichroic mirrors combines the beam output by the N-2-th dichroic mirror in the m-th group of dichroic mirrors and the sub-beam of the m-th collimated output corresponding to the N-th narrow linewidth seed light into one beam and then outputs it; the 1 The output light path of the N-1th dichroic mirror in the first group of dichroic mirrors is provided with a total reflection mirror, the output light path of the N-1th dichroic mirror in the second group of dichroic mirrors is provided with the first semi-transparent and semi-reflective mirror, the output light path of the N-1th dichroic mirror in the third group of dichroic mirrors is provided with the second semi-transparent and semi-reflective mirror, and so on, the output light path of the N-1th dichroic mirror in the Mth group of dichroic mirrors is provided with the M-1th semi-transparent and semi-reflective mirror; the first semi-transparent and semi-reflective mirror is provided on the reflection light path of the total reflection mirror, and the total reflection mirror reflects the light of the first group of dichroic mirrors. The spectrally synthesized laser output by the N-1th dichroic mirror in the dichroic mirror is reflected to the first semi-transparent and semi-reflective mirror; a combined light beam output by the first semi-transparent and semi-reflective mirror is incident on the second semi-transparent and semi-reflective mirror, a combined light beam output by the second semi-transparent and semi-reflective mirror is incident on the third semi-transparent and semi-reflective mirror, and so on, a combined light beam output by the M-2th semi-transparent and semi-reflective mirror is incident on the M-1th semi-transparent and semi-reflective mirror, and a combined light beam output by the M-1th semi-transparent and semi-reflective mirror is output as the final spectrally synthesized light beam.
7. The device for simultaneous optical fiber laser spectrum synthesis and coherent synthesis according to claim 6, characterized in that: It also includes a phase control unit, which is connected to each phase modulator.
8. The device for simultaneous optical fiber laser spectrum synthesis and coherent synthesis according to claim 7, characterized in that: The phase control unit is a closed-loop feedback phase control unit, comprising M-1 high-reflection mirrors, M-1 baffles, M-1 photodetectors and 1 phase controller; Another combined light beam outputted by the first semi-transparent and semi-reflective mirror is incident on the first high-reflective mirror, another combined light beam outputted by the second semi-transparent and semi-reflective mirror is incident on the second high-reflective mirror, and so on, another combined light beam outputted by the M-1th semi-transparent and semi-reflective mirror is incident on the M-1th high-reflective mirror, a baffle is respectively provided on the reflected light path of each high-reflective mirror, and a photoelectric detector is respectively provided on the transmitted light path of each high-reflective mirror; M-1 photodetectors are all connected to the phase controller, and the phase controller is connected to each phase modulator.
9. The device for simultaneous optical fiber laser spectrum synthesis and coherent synthesis according to claim 1 or 2 or 3 or 5 or 7 or 8, characterized in that: It also includes a light spot morphology recording unit, including a focusing lens and a camera, which collects a part of the final output spectral synthesis light beam and focuses it into the camera using the focusing lens.
10. The device for simultaneous optical fiber laser spectrum synthesis and coherent synthesis according to claim 9, characterized in that: It also includes a synthesis effect monitoring unit, including an Mth photoelectric detector and an oscilloscope, which collects a part of the final output spectral synthesis light beam to the Mth photoelectric detector, and the Mth photoelectric detector receives the light intensity signal and displays and records it in the oscilloscope.