CN113985539B - Array beam tilt aberration correction system - Google Patents
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- CN113985539B CN113985539B CN202111297607.7A CN202111297607A CN113985539B CN 113985539 B CN113985539 B CN 113985539B CN 202111297607 A CN202111297607 A CN 202111297607A CN 113985539 B CN113985539 B CN 113985539B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
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- G02B6/4249—Packages, e.g. shape, construction, internal or external details comprising arrays of active devices and fibres
Abstract
The array beam tilt aberration correction system is characterized in that n beams of sub-beams are respectively emitted after being collimated by corresponding self-adaptive fiber collimators to generate array beams, detection light is coupled into a generation light path of the array beams, a window mirror perpendicular to the optical axis of the array beams is arranged at the position of an outlet of the array beams, the window mirror is highly transparent to the array beams and highly reflective to the detection light, the detection light is returned along the original path after being reflected by the window mirror and is input to the corresponding photoelectric detectors, and the self-adaptive fiber collimator control modules change the directions of output beams of the self-adaptive fiber collimators by controlling the self-adaptive fiber collimators to enable electric signals output by the photoelectric detectors to be maximum, at the moment, the output beams of the self-adaptive fiber collimators are perpendicular to the window mirror, so that the optical axes of all the array beams are parallel, and tilt aberration correction is completed. The invention can realize the tilt aberration correction of coherent combination or incoherent combination array beams.
Description
Technical Field
The invention relates to the technical field of optical fiber laser array beam tilt aberration correction, in particular to an array beam tilt aberration correction system.
Background
The output power of a single fiber laser is limited by the physical factors such as nonlinear effect, laser loss threshold of materials and the like, and the array beam synthesis technology is widely applied in order to obtain higher power output.
Due to the influence of factors such as machining precision, system assembly error, external vibration and the like, static or dynamic oblique aberration is introduced, so that the optical axes of the array beams cannot be strictly parallel, and the use effect is seriously influenced. Aiming at the problem, a beam splitting focusing mode is generally adopted at the output end of the array beam to simulate the far field of the array beam, and the strict parallelism of the optical axes of the array beam is realized by adjusting the inclined aberration correction mechanism at the front end.
Disclosure of Invention
To address the limitations and deficiencies of the prior art, the present invention provides an array beam tilt aberration correction system.
In order to realize the purpose of the invention, the following technical scheme is adopted for realizing the purpose:
on one hand, the invention provides an array beam tilt aberration correction system, which comprises a first laser, a second laser, a wavelength division multiplexer, a beam splitter, a circulator, a power amplifier, a self-adaptive optical fiber collimator, a window mirror, a photoelectric detector and a self-adaptive optical fiber collimator control module;
the first laser and the second laser respectively generate a wavelength lambda 1 Laser light of wavelength lambda 2 The first laser and the second laser are both connected with a wavelength division multiplexer, and the wavelength outputted by the first laser and the second laser is lambda by the wavelength division multiplexer 1 、λ 2 After the laser is coupled into the beam splitter, the beam splitter is equally divided into n paths of sub-beams, a circulator, a power amplifier and self-adaptive optical fiber collimators are sequentially arranged on a transmission path corresponding to each path of sub-beam, all the self-adaptive optical fiber collimators are arranged in an array and used for outputting array beams, and the array beams have the wavelength of lambda 1 Coherently combining the array beams;
the exit of the array beam is provided with a window mirror perpendicular to the optical axis of the array beam, and the window mirror has a wavelength of lambda 1 High laser transmittance of lambda 2 The wavelength of each sub-beam is lambda 2 The laser is reflected by the window mirror and returns along the original path, and is input to the corresponding photoelectric detector and the self-adaptive optical fiber collimator through each circulatorThe control module changes the direction of the output beams of the adaptive optical fiber collimators by controlling the adaptive optical fiber collimators respectively so as to enable the electric signals output by the photodetectors to be maximum, and the output beams of the adaptive optical fiber collimators are perpendicular to the window mirror at the moment, so that the optical axes of all the array beams are parallel to finish the correction of the oblique aberration.
In the array beam tilt aberration correction system proposed for coherent synthesis of an array beam, preferably, the adaptive fiber collimator control module includes a controller and an adaptive fiber collimator driver, and the controller, the adaptive fiber collimator driver and the adaptive fiber collimator driver transmit electrical signals therebetween, and are connected by wires; the controller is pre-loaded with an optimization algorithm, receives the electric signals transmitted from each photoelectric detector, generates control signals respectively adapting to the optical fiber collimator drivers by running the optimization algorithm, drives the corresponding self-adaptive optical fiber collimators by controlling the respectively adapting optical fiber collimator drivers, and changes the direction of the output light beams of the respectively adapting optical fiber collimators so as to maximize the electric signals output by each photoelectric detector.
In the array beam tilt aberration correction system provided for coherent synthesis of the array beam, preferably, the first laser, the second laser, the wavelength division multiplexer, the beam splitter, the circulator, the power amplifier, the adaptive fiber collimator, and the photodetector are all optical fibers or optical fiber coupling devices, and the devices are connected by fiber fusion or jumper connection.
In the array beam tilt aberration correction system proposed above for coherently combining the array beams, preferably, the beam splitter employs a 1 × n polarization maintaining fiber beam splitter, and an input fiber model of the beam splitter is the same as an output fiber model of the wavelength division multiplexer.
In the array beam tilt aberration correction system proposed above for coherently combining the array beams, preferably, the beam splitter outputs the wavelength λ in the wavelength division multiplexer output laser light 1 Laser light of wavelength lambda 2 The laser is equally divided, and each path of sub-beam output by the beam splitter contains the same power and has the wavelength of lambda 1 And a wavelength of λ 2 The laser of (1).
In the array beam tilt aberration correction system proposed above for coherently combining the array beams, preferably, the first laser employs a single-frequency or narrow-linewidth polarization-maintaining fiber laser.
In the array beam tilt aberration correction system proposed for coherently combining the array beams, preferably, the second laser is a single-mode fiber laser, whose output power meets the detection requirement of the photodetector, and whose center wavelength is outside the gain spectral line range of the first laser.
In the array beam tilt aberration correction system proposed for coherent combination of the array beams, preferably, two side faces of the window mirror are planes, and the window mirror is coated with a film so as to be able to correct the wavelength λ 1 High laser transmission of (2) at wavelength of λ 2 High reflectivity.
In another aspect, the invention provides an array beam tilt aberration correction system, comprising a first laser, a second laser, a circulator, an adaptive fiber collimator, a window mirror, a photodetector, and an adaptive fiber collimator control module;
the n first lasers are respectively and correspondingly connected with a self-adaptive optical fiber collimator, and the n beams output by the n first lasers have the wavelength of lambda 1 The laser beams are respectively collimated by corresponding self-adaptive optical fiber collimators, all the self-adaptive optical fiber collimators are arranged in an array and used for outputting array beams, and the array beams have the wavelength of lambda 1 Incoherent combining the array beams;
a window mirror perpendicular to the optical axis of the array beam is arranged at the exit of the array beam and has a wavelength of lambda 1 High laser transmittance of lambda 2 The laser of (2) is high-reflective;
n beams output by the n second lasers have a wavelength lambda 2 The detection light is coupled into the corresponding first laser after passing through the corresponding circulator respectively, and then is incident into the window lens through the corresponding first laser and the adaptive optical fiber collimator, and the wavelength is lambda 2 The laser is reflected by the window mirror and then returns along the original path and passes through each loopThe adaptive optical fiber collimator control module changes the direction of the output light beam of each adaptive optical fiber collimator by controlling each adaptive optical fiber collimator so as to enable the electric signal output by each photoelectric detector to be maximum, the output light beam of each adaptive optical fiber collimator is perpendicular to the window mirror at the moment, and therefore the optical axes of all array light beams are parallel, and oblique aberration correction is completed.
In the array beam tilt aberration correction system proposed for the incoherent synthesized array beam, preferably, the adaptive fiber collimator control module includes a controller and an adaptive fiber collimator driver, and the controller, the adaptive fiber collimator driver and the adaptive fiber collimator driver transmit electrical signals therebetween, and are connected by wires; the controller is pre-loaded with an optimization algorithm, receives the electric signals transmitted from each photoelectric detector, generates control signals respectively adapting to the optical fiber collimator drivers by running the optimization algorithm, and changes the direction of output light beams of the respectively adapting optical fiber collimators to maximize the electric signals output by each photoelectric detector by controlling the respectively adapting optical fiber collimator drivers to drive the corresponding self adapting optical fiber collimators.
In the above array beam tilt aberration correction system provided for the incoherent combined array beam, preferably, the first laser, the second laser, the circulator, the adaptive fiber collimator, and the photodetector are all optical fibers or optical fiber coupling devices, and the optical fibers are connected by fiber fusion or jumper connection.
In the above system for correcting array beam tilt aberration proposed for incoherent combining of array beams, preferably, the first laser is an oscillation type or amplification type laser, and the first laser has a fiber tap extending from a first end of a laser cavity and has a wavelength λ 2 The detection light is coupled into the optical path of the first laser from the optical fiber tap at the first end, and the second end of the laser resonant cavity of the first laser is the laser output end of the first laser.
In the array beam tilt aberration correction system proposed for the incoherent combined array beam, the preferred schemes of the second laser, the circulator, the adaptive fiber collimator, the photodetector and the window mirror are the same as those of the array beam tilt aberration correction system proposed for the coherent combined array beam, and are not described herein again.
Compared with the prior art, the invention has the advantages that:
in the invention, n sub-beams are respectively emitted after being collimated by corresponding self-adaptive optical fiber collimators to generate array beams, detection light is coupled into a generation light path of the array beams, a window mirror vertical to the optical axis of the array beams is arranged at the outlet of the array beams, the window mirror is highly transparent to the array beams and highly reflective to the detection light, the detection light returns along the original path after being reflected by the window mirror and is input into corresponding photoelectric detectors, and the self-adaptive optical fiber collimators control module changes the directions of output beams of the self-adaptive optical fiber collimators by controlling the self-adaptive optical fiber collimators to enable the electric signals output by the photoelectric detectors to be maximum, and the output beams of the self-adaptive optical fiber collimators are vertical to the window mirror at the moment, so that the optical axes of all the array beams are parallel to finish the correction of oblique aberration. The system provided by the invention is simple and stable, has a compact structure, can realize the function of correcting the oblique aberration in the coherent synthesis and incoherent synthesis fields, and has wide application prospect.
In addition, except the window mirror, the rest of the system is an optical fiber device, so that the system is simple and stable, has a compact structure and has higher practical value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of the present invention;
the reference numerals in the figures denote:
1. a first laser; 2. a second laser; 3. a wavelength division multiplexer; 4. a beam splitter; 5. a circulator; 6. a power amplifier; 7. an adaptive fiber collimator; 8. a window mirror; 9. a photodetector; 10. a controller; 11. an adaptive fiber collimator driver.
The implementation, functional features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; the connection can be mechanical connection, electrical connection, physical connection or wireless communication connection; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The array beam tilt aberration correction scheme provided by the invention can be used for coherently combining array beams and also can be used for incoherently combining array beams, and the following description is respectively directed to the two cases.
Referring to fig. 1, the present embodiment provides an array beam tilt aberration correction system, including a first laser 1, a second laser 2, a wavelength division multiplexer 3, a beam splitter 4, a circulator 5, a power amplifier 6, an adaptive fiber collimator 7, a window mirror 8, a photodetector 9, and an adaptive fiber collimator control module;
the first laser 1 and the second laser 2 respectively generate light with the wavelength of lambda 1 Laser light of wavelength lambda 2 The first laser 1 and the second laser 2 are both connected with a wavelength division multiplexer 3, and the wavelength outputted by the first laser 1 and the second laser 2 is lambda by the wavelength division multiplexer 3 1 、λ 2 After the laser is coupled into the beam splitter 4, the laser is equally divided into n paths of sub-beams by the beam splitter 4, a circulator 5, a power amplifier 6 and a self-adaptive optical fiber collimator 7 are sequentially arranged on a transmission path corresponding to each path of sub-beam, all the self-adaptive optical fiber collimators 7 are arranged in an array mode and used for outputting array beams, and the array beams have the wavelength of lambda 1 Coherently combining the array beams;
a window mirror 8 perpendicular to the optical axis of the array beam is arranged at the exit of the array beam, and the window mirror 8 has a wavelength of lambda 1 High laser transmittance of lambda 2 Laser of (2)High reflectivity, with a wavelength of λ in each sub-beam 2 The laser light is reflected by the window mirror 8 and then returns along the original path, and is input to the corresponding photoelectric detector 9 through each circulator 5.
The adaptive optical fiber collimator control module comprises a controller 10 and an adaptive optical fiber collimator driver 11, wherein electric signals are transmitted among the controller 10, the adaptive optical fiber collimator driver 11 and the adaptive optical fiber collimator 7 and are connected through electric wires.
The controller 10 is pre-loaded with an optimization algorithm, the controller 10 receives the electrical signals transmitted from each photodetector 9, generates control signals respectively adapting to the optical fiber collimator driver 11 by running the optimization algorithm, and changes the direction of the output beam of each adaptive optical fiber collimator 7 by controlling the respective adaptive optical fiber collimator driver 11 to drive the corresponding adaptive optical fiber collimator 7, so that the electrical signals output by each photodetector 9 reach the maximum. At the moment, the output beams of the adaptive optical fiber collimators are perpendicular to the window mirror, so that the optical axes of all the array beams are parallel, and the oblique aberration correction is completed.
The first laser 1, the second laser 2, the wavelength division multiplexer 3, the beam splitter 4, the circulator 5, the power amplifier 6, the adaptive optical fiber collimator 7 and the photoelectric detector 9 are all optical fibers or optical fiber coupling devices, and the devices are connected in an optical fiber fusion or jumper connection mode.
The first laser 1 adopts a commercial single-frequency or narrow-linewidth polarization-maintaining fiber laser, and the output power and the central wavelength of the laser are determined by a user according to the system requirement.
The second laser 2 adopts a commercial single-mode fiber laser, the output power of the commercial single-mode fiber laser meets the detection requirement of a photoelectric detector, and the center wavelength of the commercial single-mode fiber laser is located outside the gain spectral line range of the first laser.
The wavelength division multiplexer 3 can adopt a commercial polarization maintaining tapered optical fiber wavelength division multiplexer, the input wavelength of the wavelength division multiplexer is the output wavelength of the first laser and the output wavelength of the second laser respectively, the models of two input optical fibers of the wavelength division multiplexer are the same as the models of the output optical fibers of the first laser and the second laser respectively, and the withstand power of the wavelength division multiplexer meets the output power requirements of the first laser and the second laser.
The beam splitter 4 adopts a commercial 1 Xn polarization maintaining optical fiber beam splitter, the type of an input optical fiber of the beam splitter is the same as that of an output optical fiber of the wavelength division multiplexer, and the beam splitter can equally divide the output laser power into n paths. The beam splitter 4 makes the wavelength of the laser output by the wavelength division multiplexer be lambda 1 Laser light of wavelength lambda 2 The laser is equally divided, and each path of sub-beam output by the beam splitter contains the same power and has the wavelength of lambda 1 And a wavelength of λ 2 The laser of (1).
The circulator 5 adopts a commercial optical fiber circulator, the wavelength covers the output wavelengths of the first laser and the second laser, and the input optical fiber model of the circulator is the same as the output optical fiber model of the beam splitter. The circulator can separate light transmitted in two directions, specifically, emission laser light is transmitted along the direction of the ports a to b, and reflection probe light is transmitted along the direction of the ports b to c.
The power amplifier 6 can adopt a commercial narrow linewidth polarization-maintaining fiber laser amplifier, and the output power is determined by a user according to the requirement.
The adaptive optical fiber collimator 7 can adopt a commercial optical fiber collimator with an oblique aberration correction function, and can also be developed according to the scheme of a high-performance optical fiber end cap two-dimensional controller part in the research of optical fiber laser target in loop coherent synthesis technology of the international defense science and technology university journal of winter. The collimator has high transmittance to the wavelengths of two lasers emitted by the main laser seed source and the detection laser, and can resist the output power of the optical fiber amplifier. The type of the tail fiber of the self-adaptive optical fiber collimator is the same as that of the output optical fiber of the power amplifier, and the number of the self-adaptive optical fiber collimators in the self-adaptive optical fiber collimator array is determined by a user according to the requirement.
The window mirror 8 is made of fused quartz or other strong light resistant glass or crystal materials, the window mirror 8 is a double-sided mirror, two side surfaces of the window mirror are both planes, and two side surfaces are plated with lambda 1 Coating a wavelength reflection reducing film on the laser light incident surface 2 The wavelength high reflection film can resist the output power of the n-path optical fiber amplifier.
The photodetector 9 may be a commercial fiber coupling photodetector, the response bandwidth is greater than the highest frequency of the control signal output by the controller, the response band covers the wavelength of the second laser, the detection sensitivity is matched with the output optical power in the direction of the circulator port c, and the type of the pigtail is the same as the type of the output optical fiber in the direction of the circulator port c.
The controller 10 may be developed by a signal processor such as a single chip, an FPGA, a DSP, etc., and may receive an electrical signal transmitted from the photodetector, generate a corresponding voltage control signal, and transmit the voltage control signal to the adaptive optical fiber collimator driver 11. The algorithm running on the controller 10 may employ a known optimization algorithm such as a hill climbing method. The electric signal output by the photoelectric detector 9 is controlled to be the maximum value, and then the optical axes of all the array beams are parallel.
Referring to fig. 2, the present embodiment provides an array beam tilt aberration correction system, including a first laser 1, a second laser 2, a circulator 5, an adaptive fiber collimator 7, a window mirror 8, a photodetector 9, and an adaptive fiber collimator control module;
the n first lasers 1 are respectively and correspondingly connected with a self-adaptive optical fiber collimator 7, and the n beams output by the n first lasers 1 have the wavelength lambda 1 The laser beams are collimated by corresponding adaptive optical fiber collimators 7 respectively, all the adaptive optical fiber collimators 7 are arranged in an array and used for outputting array beams, and the array beams have the wavelength of lambda 1 Incoherent combining the array beams;
a window mirror 8 vertical to the optical axis of the array beam is arranged at the exit of the array beam, and the window mirror 8 has a wavelength of lambda 1 High laser transmittance of lambda 2 The laser of (2) is high-reflective;
n beams output by the n second lasers 2 have the wavelength lambda 2 The detection light is respectively coupled into the corresponding first laser 1 after passing through the corresponding circulator 5, and then enters the window mirror 8 through the corresponding first laser 1 and the adaptive optical fiber collimator 7, and the wavelength is lambda 2 The laser light is reflected by the window mirror 8 and then returns along the original path, and is input to the corresponding photoelectric detector 9 through each circulator 5.
The adaptive optical fiber collimator control module comprises a controller 10 and an adaptive optical fiber collimator driver 11, wherein electric signals are transmitted among the controller 10, the adaptive optical fiber collimator driver 11 and the adaptive optical fiber collimator 7 and are connected through electric wires. The controller 10 is pre-loaded with an optimization algorithm, the controller 10 receives electrical signals transmitted from each of the photodetectors 9, generates control signals respectively adapted to the optical fiber collimator drivers 11 by running the optimization algorithm, and changes the direction of output light beams of the respectively adapted optical fiber collimators 7 by controlling the respectively adapted optical fiber collimator drivers 11 to drive the corresponding self-adapted optical fiber collimators 7, so as to maximize the electrical signals output by each of the photodetectors 9. At this time, the output beams of the adaptive optical fiber collimators 7 are perpendicular to the window mirror 8, so that the optical axes of all the array beams are parallel, and the oblique aberration correction is completed.
The first laser 1, the second laser 2, the circulator 5, the adaptive optical fiber collimator 7 and the photoelectric detector 9 are optical fibers or optical fiber coupling devices, and the devices are connected by adopting an optical fiber fusion or jumper connection mode.
The first laser 1 is an oscillation type or amplification type laser, and the first end of the laser resonant cavity of the first laser 1 is provided with an optical fiber tap extending out with a wavelength of lambda 2 The detection light is coupled into the optical path of the first laser from the optical fiber tap at the first end, and the second end of the laser resonant cavity of the first laser is the laser output end of the first laser.
In the embodiment shown in fig. 2, the performance requirements and the type selection requirements of the second laser 2, the circulator 5, the adaptive fiber collimator 7, the photodetector 9, and the window mirror 8 are the same as those of the corresponding devices in the array beam tilt aberration correction system proposed for coherent combination of the array beams shown in fig. 1, and are not described herein again.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (11)
1. An array beam tilt aberration correction system, characterized by: the optical fiber laser device comprises a first laser, a second laser, a wavelength division multiplexer, a beam splitter, a circulator, a power amplifier, a self-adaptive optical fiber collimator, a window mirror, a photoelectric detector and a self-adaptive optical fiber collimator control module;
the first laser and the second laser respectively generate a wavelength lambda 1 Laser light of wavelength lambda 2 The first laser and the second laser are both connected with a wavelength division multiplexer, and the wavelength outputted by the first laser and the second laser is lambda by the wavelength division multiplexer 1 、λ 2 After the laser is coupled into the beam splitter, the beam splitter is equally divided into n paths of sub-beams, a circulator, a power amplifier and self-adaptive optical fiber collimators are sequentially arranged on a transmission path corresponding to each path of sub-beam, all the self-adaptive optical fiber collimators are arranged in an array and used for outputting array beams, and the array beams have the wavelength of lambda 1 Coherently combining the array beams;
the exit of the array beam is provided with a window mirror vertical to the optical axis of the array beam, and the window mirror has a wavelength of lambda 1 High laser transmittance of lambda 2 The wavelength of each sub-beam is lambda 2 The laser is reflected by the window mirror and then returns along the original path, and is input to the corresponding photoelectric detector through each circulator, the self-adaptive optical fiber collimator control module changes the output beam direction of each self-adaptive optical fiber collimator by controlling each self-adaptive optical fiber collimator so as to enable the electric signal output by each photoelectric detector to be maximum, and at the moment, the output beam of each self-adaptive optical fiber collimator is vertical to the window mirror, so that the optical axes of all array beams are parallel, and the oblique aberration correction is completed.
2. The array beam tilt aberration correction system of claim 1, wherein: the control module of the self-adaptive optical fiber collimator comprises a controller and a self-adaptive optical fiber collimator driver, wherein electric signals are transmitted among the controller, the self-adaptive optical fiber collimator driver and the self-adaptive optical fiber collimator and are connected by adopting electric wires; the controller is pre-loaded with an optimization algorithm, receives the electric signals transmitted from each photoelectric detector, generates control signals respectively adapting to the optical fiber collimator drivers by running the optimization algorithm, and changes the direction of output light beams of the respectively adapting optical fiber collimators to maximize the electric signals output by each photoelectric detector by controlling the respectively adapting optical fiber collimator drivers to drive the corresponding self adapting optical fiber collimators.
3. The array beam tilt aberration correction system according to claim 1 or 2, characterized in that: the first laser, the second laser, the wavelength division multiplexer, the beam splitter, the circulator, the power amplifier, the self-adaptive optical fiber collimator and the photoelectric detector are optical fibers or optical fiber coupling devices, and the optical fibers are connected with one another in an optical fiber fusion or jumper connection mode.
4. The array beam tilt aberration correction system of claim 3, wherein: the beam splitter adopts a 1 xn polarization maintaining optical fiber beam splitter, and the type of an input optical fiber of the beam splitter is the same as that of an output optical fiber of the wavelength division multiplexer;
the beam splitter makes the wavelength of the laser output by the wavelength division multiplexer be lambda 1 Laser light of wavelength lambda 2 The laser is equally divided, and each path of sub-beam output by the beam splitter contains the same power and has the wavelength of lambda 1 And a wavelength of λ 2 The laser of (1).
5. The array beam tilt aberration correction system of claim 1, 2 or 4, wherein: the first laser adopts a single-frequency or narrow-linewidth polarization-maintaining fiber laser;
the second laser adopts a single-mode fiber laser, the output power of the second laser meets the detection requirement of the photoelectric detector, and the center wavelength of the second laser is located outside the gain spectral line range of the first laser.
6. The array beam tilt aberration correction system of claim 1, wherein: two side surfaces of the window mirror are planes, and the window mirror can be coated with a film to enable the window mirror to have a wavelength of lambda 1 High laser transmittance of lambda 2 High reflectivity.
7. An array beam tilt aberration correction system, characterized by: the optical fiber laser circulator comprises a first laser, a second laser, a circulator, a self-adaptive optical fiber collimator, a window mirror, a photoelectric detector and a self-adaptive optical fiber collimator control module;
the n first lasers are respectively and correspondingly connected with a self-adaptive optical fiber collimator, and the n beams output by the n first lasers have the wavelength of lambda 1 The laser beams are respectively collimated by corresponding self-adaptive optical fiber collimators, all the self-adaptive optical fiber collimators are arranged in an array and used for outputting array beams, and the array beams have the wavelength of lambda 1 Incoherent combining the array beams;
a window mirror perpendicular to the optical axis of the array beam is arranged at the exit of the array beam and has a wavelength of lambda 1 High laser transmission of (2) at wavelength of λ 2 The laser of (2) is high-reflective;
n beams output by the n second lasers have a wavelength of lambda 2 The detection light is coupled into the corresponding first laser after passing through the corresponding circulator respectively, and then enters the window lens through the corresponding first laser and the self-adaptive optical fiber collimator, and the wavelength is lambda 2 The laser is reflected by the window mirror and then returns along the original path, and is input to the corresponding photoelectric detector through each circulator, the self-adaptive optical fiber collimator control module changes the output beam direction of each self-adaptive optical fiber collimator by controlling each self-adaptive optical fiber collimator so as to enable the electric signal output by each photoelectric detector to be maximum, and the output beam of each self-adaptive optical fiber collimator is vertical to the window mirror at the moment, so that the optical axes of all array beams are parallel, and the oblique aberration correction is completed.
8. The array beam tilt aberration correction system of claim 7, wherein: the self-adaptive optical fiber collimator control module comprises a controller and a self-adaptive optical fiber collimator driver, wherein electric signals are transmitted among the controller, the self-adaptive optical fiber collimator driver and the self-adaptive optical fiber collimator and are connected through electric wires; the controller is pre-loaded with an optimization algorithm, receives the electric signals transmitted from each photoelectric detector, generates control signals respectively adapting to the optical fiber collimator drivers by running the optimization algorithm, drives the corresponding self-adaptive optical fiber collimators by controlling the respectively adapting optical fiber collimator drivers, and changes the direction of the output light beams of the respectively adapting optical fiber collimators so as to maximize the electric signals output by each photoelectric detector.
9. The array beam tilt aberration correction system of claim 7 or 8, wherein: the first laser, the second laser, the circulator, the self-adaptive optical fiber collimator and the photoelectric detector are all optical fibers or optical fiber coupling devices, and the devices are connected in an optical fiber fusion or jumper connection mode.
10. The array beam tilt aberration correction system of claim 9, wherein: the first laser is an oscillation type or amplification type laser, and the first end of the laser resonant cavity of the first laser is provided with an optical fiber tap extending out with the wavelength of lambda 2 The detection light is coupled into the light path of the first laser from the optical fiber tap at the first end, and the second end of the laser resonant cavity of the first laser is the laser output end of the first laser;
the second laser adopts a single-mode fiber laser, the output power of the second laser meets the detection requirement of the photoelectric detector, and the center wavelength of the second laser is located outside the gain spectral line range of the first laser.
11. The array beam tilt aberration correction system of claim 7, 8 or 10, wherein: two side surfaces of the window mirror are planes, and the window mirror can be coated with a film to enable the window mirror to have a wavelength of lambda 1 High laser transmittance of lambda 2 High reflectivity.
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| CN112130337A (en) * | 2020-10-14 | 2020-12-25 | 中国人民解放军国防科技大学 | Synchronous control system and method for phase and inclined phase of fiber laser array piston |
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| JP2019164886A (en) * | 2018-03-19 | 2019-09-26 | 株式会社日立ハイテクノロジーズ | Beam irradiation device |
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