CN109818247B - Coherent combination phase control method and system for laser array - Google Patents
Coherent combination phase control method and system for laser array Download PDFInfo
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- CN109818247B CN109818247B CN201910088762.4A CN201910088762A CN109818247B CN 109818247 B CN109818247 B CN 109818247B CN 201910088762 A CN201910088762 A CN 201910088762A CN 109818247 B CN109818247 B CN 109818247B
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Abstract
The invention discloses a coherent synthesis phase control method and a system for a laser array, wherein the method comprises the following steps: performing secondary beam splitting on the seed laser through at least two stages of optical fiber beam splitters, wherein one part of the seed laser is reflected, and the other part of the seed laser is transmitted after being amplified and collimated; the transmitted laser array is divided into M primary sub-arrays according to the output of the secondary optical fiber beam splitter, each primary sub-array is compressed, then a phase difference signal is detected and converted into a phase control signal, and the secondary sub-lasers output by each secondary optical fiber beam splitter are respectively controlled to be in the same phase; and extracting one beam from each primary subarray to form K secondary sub laser arrays according to the adjacent relation and the least principle so as to lock the secondary sub lasers of all the primary subarrays in a phase after compression and phase detection. The problem of among the prior art along with laser figure increase lead to synthetic light beam light intensity fluctuation to change and weaken is solved, realize the hierarchical integrated control of modularization, reduce the requirement to photoelectric detector spirit density and phase control module.
Description
Technical Field
The invention relates to the technical field of coherent synthesis of laser, in particular to a coherent synthesis phase control method and a coherent synthesis phase control system for a laser array.
Background
The output power of the single-path laser is limited by physical phenomena such as thermal effect, nonlinear effect, pumping power, optical damage and the like, and the single-path laser is only used for achieving higher output power. The method is an important method for realizing a high-power and high-brightness laser system by constructing a laser array by utilizing multi-path lasers and performing coherent synthesis. A Master Oscillator Power Amplifier (MOPA) based on active phase control is commonly used in the Amplifier structure. The system structure is shown in fig. 1, and mainly comprises a seed laser 1, a laser beam splitter 2, a plurality of phase modulators 3, a plurality of laser amplifiers 4, a plurality of laser collimators 5, a beam splitter 6, a phase detection module 7 and a phase control module 8. The laser emitted by the seed laser 1 is split by the laser beam splitter 2, and each laser beam enters the phase modulator 3. Each phase modulator 3 is optically connected to each corresponding laser amplifier 4. Each laser amplifier 4 is optically connected to a laser collimator 5. The laser beams emitted from the laser collimators 5 form array laser beams and enter the beam splitter 6. 99% of high-power laser is reflected by the spectroscope 6 and then emitted to an action target; after being split by the beam splitter 6, the < 1% low-power laser carries optical information to enter the phase detection module 7, which generally consists of a lens, a small hole and a photoelectric detector and is used for extracting central main lobe energy of a far-field spot of a synthesized beam. The phase detection block 7 outputs the electrical signal to the phase control block 8. The phase control module 8 calculates a phase error between the respective laser beams, generates a control signal, and outputs the control signal to the respective phase modulators 3. The phase control signal adjusts the piston phase difference of each path of laser, so that the output array laser keeps the same phase.
However, as the number of laser paths increases, the contribution of the phase noise of each laser path to the fluctuation of the light intensity of the composite beam is weakened, and the sensitivity of the photoelectric detector is required to be too high; furthermore, the increased number of laser paths also presents challenges to the circuit design of the phase control module 8, since each phase modulator requires a separate control signal. Furthermore, the control bandwidth of the phase control module 8 decreases with the number of the synthesized lasers, so that the phase noise cannot be effectively controlled.
Disclosure of Invention
The invention provides a coherent synthesis phase control method and system for a laser array, which are used for overcoming the defects that the sensitivity requirement of a photoelectric phase detection module is higher along with the increase of the number of laser paths, the circuit design of a phase control module is more complex and the like in the prior art.
To achieve the above object, the present invention provides a coherent combining phase control method for a laser array, comprising:
step 1, performing secondary beam splitting on seed laser through at least two stages of optical fiber beam splitters to form M beams of primary sub laser through the primary optical fiber beam splitter, and forming N beams of secondary sub laser through each beam of primary sub laser through the secondary optical fiber beam splitter;
step 2, after the MxN beams of secondary sub-laser are respectively amplified by the MxN laser amplifiers and collimated by the MxN collimators, part of the secondary sub-laser is reflected to an action target, and the other part of the secondary sub-laser is transmitted;
step 3, dividing the transmitted M multiplied by N secondary sub-lasers into M primary sub-arrays according to the output of M secondary optical fiber beam splitters, compressing each primary sub-array by a primary light beam duty ratio compression module, obtaining phase difference signals of the N secondary sub-lasers in the primary sub-arrays by a primary phase detection module, converting the phase difference signals into phase control signals, and controlling the N secondary sub-lasers output by each secondary optical fiber beam splitter to be output in the same phase;
and 4, extracting at least one secondary sub-laser from each primary subarray according to the adjacent relation, forming K secondary sub-laser arrays according to the adjacent relation and the least principle to connect all the primary sub-arrays together, enabling each secondary sub-laser array to pass through a secondary light beam duty ratio compression module respectively, obtaining phase difference signals of more than two secondary sub-lasers in the secondary subarrays through a secondary phase detection module, converting the phase difference signals into phase control signals, controlling the M primary sub-lasers output by each primary optical fiber beam splitter to be output in the same phase, and enabling all the secondary sub-lasers to be locked in the same phase.
To achieve the object of the present invention, the present invention further provides a coherent combining phase control system for a laser array, comprising:
the array fiber beam splitter comprises at least two stages of array fiber beam splitters, wherein each stage of array fiber beam splitter comprises a primary fiber beam splitter and M secondary fiber beam splitters, the primary fiber beam splitter divides incident seed laser into M primary sub laser beams, and each secondary fiber beam splitter divides each sub laser beam into N secondary sub laser beams;
at least two-stage array phase modulators including M or (M-1) one-stage phase modulators and M x N two-stage phase modulators; wherein, M or (M-1) primary phase modulators are respectively connected between the primary optical fiber beam splitter and the M secondary optical fiber beam splitters and used for locking M primary sub-laser phases output by the primary optical fiber beam splitter; the M multiplied by N secondary phase modulators are respectively connected to the M multiplied by N laser output ends of the M secondary optical fiber beam splitters and used for locking N secondary sub-laser phases output by the secondary optical fiber beam splitters;
a plurality of laser amplifiers, the number of which is the same as that of the secondary sub laser beams; for amplifying the secondary sub-laser;
the number of the laser collimators is the same as that of the secondary sub laser beams; for collimating the secondary sub-laser;
the spectroscope is used for reflecting a part of secondary sub laser incident by the laser collimator to an action target and transmitting the other part of secondary sub laser incident by the laser collimator;
the at least two-stage array light beam duty ratio compression module comprises M first-stage light beam duty ratio compression modules and K second-stage light beam duty ratio compression modules, the M multiplied by N second-stage sub-lasers are divided into M first-stage sub-arrays according to the number of the second-stage optical fiber beam splitters, and the M first-stage light beam duty ratio compression modules respectively compress the M first-stage sub-arrays; extracting at least one secondary sub-laser from each primary sub-array according to the adjacent relation, forming K secondary sub-laser arrays according to the adjacent relation and the least principle so as to connect all the primary sub-arrays together, and compressing the K sub-laser arrays by K secondary light beam duty ratio compression modules respectively;
at least two stages of array phase detection modules; the system comprises M primary phase detection modules and K secondary phase detection modules; the M primary phase detection modules are used for detecting M primary sub-arrays and respectively feeding back phase difference signals of N secondary sub-lasers in each primary sub-array to the primary phase control module, and the K secondary phase detection modules are used for detecting K secondary sub-arrays and respectively feeding back phase difference signals of more than two secondary sub-lasers in each secondary sub-array to one secondary phase control module;
the M primary phase control modules form M multiplied by N phase control signals according to the phase difference signals of the M N secondary sub-lasers and correspondingly input the M multiplied by N secondary phase modulators; locking the phase of the N secondary sub-lasers formed by each secondary optical fiber beam splitter;
k two-level phase control modules, forming M or (M-1) phase control signals according to the phase difference signals of K more than two beams of two-level sub-lasers, and correspondingly inputting M or (M-1) one-level phase modulators; and locking the phase of the M primary sub laser beams formed by each primary optical fiber beam splitter, thereby locking the phase of all the secondary sub laser beams.
The coherent synthesis phase control method and system for the laser array provided by the invention modularize a large number of beam splitting laser arrays, namely, divide the beam splitting laser arrays into a plurality of sub laser arrays, and then perform hierarchical control on the modules, specifically as follows: firstly, sub laser phases in the sub laser arrays are locked through a primary phase detection module array and a phase control circuit, so that the same phase in the sub laser arrays is realized; then, the two-stage phase detection module array and the phase control circuit lock mutually adjacent sub laser arrays to lock the phase between all the sub laser arrays, and finally realize the same-phase output of all the split laser.
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 block diagram of a main oscillation power amplifier based on active phase control in the prior art;
fig. 2 is a flowchart of a coherent combining phase control method for a laser array according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a coherent combining phase control system for a laser array according to a second embodiment of the present invention;
FIG. 4 is a schematic diagram of the modular division of the laser array and its displacement during the compression process in the second embodiment;
fig. 5 is a schematic diagram of the modular division of the laser array in the coherent combining phase control system for the laser array and the displacement thereof during the compression process according to the third embodiment of the present invention;
fig. 6 is a schematic diagram of the modular division of the laser array in the coherent combining phase control system for the laser array and the displacement thereof during the compression process according to the fourth embodiment of the present invention;
fig. 7 is a schematic diagram of the modularized division of the laser array in the coherent combining phase control system for the laser array and the displacement thereof in the compression process according to the fifth embodiment of the present invention.
The implementation, functional features and advantages of the objects 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 connected internally or in any other suitable relationship, unless expressly stated otherwise. 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.
Example one
As shown in fig. 2, an embodiment of the present invention provides a coherent combining phase control method for a laser array, including:
step S1, the seed laser is split secondarily by at least two stages of optical fiber beam splitters, M beams of primary sub laser are formed by the primary optical fiber beam splitters, and N beams of secondary sub laser are formed by each beam of primary sub laser by the secondary optical fiber beam splitters;
step S2, after the M multiplied by N secondary sub-lasers are respectively amplified by M multiplied by N laser amplifiers and collimated by M multiplied by N collimators, one part of the secondary sub-lasers are reflected to an action target, and the other part of the secondary sub-lasers are transmitted through the array diaphragm so that the central light spot of the secondary sub-lasers can pass through;
step S3, dividing the M multiplied by N secondary sub-lasers into M primary sub-arrays according to the output of M secondary optical fiber beam splitters, compressing each primary sub-array by a primary light beam duty ratio compression module, obtaining phase difference signals of the N secondary sub-lasers in the primary sub-arrays by a primary phase detection module, converting the phase difference signals into phase control signals, and controlling the N secondary sub-lasers output by each secondary optical fiber beam splitter to be output in the same phase;
step S4, extracting at least one secondary sub-laser from each primary subarray according to the adjacent relation, forming K secondary sub-laser arrays according to the adjacent relation and the least principle to connect all the primary sub-arrays together, after each secondary sub-laser array passes through a secondary light beam duty ratio compression module, obtaining phase difference signals of more than two secondary sub-lasers in the secondary subarray through a secondary phase detection module, converting the phase difference signals into phase control signals, controlling M primary sub-lasers output by each primary optical fiber beam splitter to be output in the same phase, and further enabling all the secondary sub-lasers to be locked in the same phase.
In a first preferred embodiment, the step S3 includes:
step S31a, M primary sub-arrays are linear arrays, and N secondary sub-lasers forming the primary sub-arrays are also linear arrays; selecting two secondary sub-lasers with the most similar positions in two primary sub-arrays adjacent from head to tail to form a secondary sub-laser array;
step S32a, respectively approaching (N-1) beams of secondary sub-lasers in the primary sub-array to the secondary sub-lasers positioned in the center of the array in the process of compressing by the primary beam duty ratio compression module;
step S33a, two or more secondary sub-lasers in the secondary sub-array approach to the adjacent boundary point of the primary sub-array respectively during the compression process by the secondary light beam duty ratio compression module.
In a second preferred embodiment, the step S3 includes:
step S31b, the N secondary sub-lasers forming the primary sub-array comprise regular L-shaped array units; the regular L-shaped edge array unit comprises a central point and edge points positioned around the central point, and the edge points are arranged according to the edges or the vertexes of the regular L-shaped edge; the M primary sub-arrays are formed by aligning regular L-shaped edge array units from side to side; selecting the secondary sub-laser with the most similar position in the adjacent 2-L primary sub-arrays to form a secondary sub-laser array;
step S32b, respectively approaching (N-1) beams of secondary sub-lasers positioned at the edge in the primary sub-array to the secondary sub-lasers positioned at the center of the array in the compression process of the primary light beam duty ratio compression module;
and step S33b, respectively approaching 2-L beams of secondary sub-lasers in the secondary sub-array to adjacent junction points of the primary sub-array in the compression process of the secondary beam duty ratio compression module.
As a specific mode of the second preferred embodiment, in step S3:
step S31c, the N secondary sub-lasers forming the primary sub-array comprise square array units; the square array unit comprises a central point and edge points positioned around the central point, wherein the edge points are arranged according to four edges of a square; the M primary sub-arrays are arranged in rows and/or columns by the square array according to the alignment of the edges; selecting the secondary sub-laser with the most similar position in 2-4 adjacent primary sub-arrays to form a secondary sub-laser array;
step S32c, respectively approaching (N-1) beams of secondary sub-lasers positioned at the edge in the primary sub-array to the secondary sub-lasers positioned at the center of the array in the compression process of the primary light beam duty ratio compression module;
and S33c, respectively approaching 2-4 beams of secondary sub-lasers in the secondary sub-array to adjacent junction points of the primary sub-array in the compression process of the secondary beam duty ratio compression module.
As another specific mode of the second preferred embodiment, in step S3:
step S31d, the N beams of secondary sub-lasers forming the primary sub-array comprise regular hexagonal array units; the regular hexagon array unit comprises a central point and edge points positioned around the central point, wherein the edge points are arranged according to six edges or six vertexes of the regular hexagon; the M primary sub-arrays are arranged from the center to the edge side by side to form a multilayer structure; selecting the secondary sub-laser with the most similar position in the three adjacent primary sub-arrays to form a secondary sub-laser array;
step S31d, respectively approaching (N-1) beams of secondary sub-lasers positioned at the edge in the primary sub-array to the secondary sub-lasers positioned at the center of the array in the compression process of the primary light beam duty ratio compression module;
step S31d, three beams of secondary sub-lasers in the secondary sub-array respectively approach to the adjacent junction points of the primary sub-array in the process of compression by the secondary beam duty ratio compression module.
Example two
Referring to fig. 3, a coherent combining phase control system for a laser array comprises: the device comprises a seed laser 1, a laser beam splitter 2, a plurality of phase modulators 3, a plurality of laser amplifiers 4, a plurality of laser collimators 5, a beam splitter 6, a phase detection module 7, a phase control module 8, an array diaphragm 9 and an array beam duty ratio compression module 10; the seed laser 1 firstly utilizes a 1 xM optical fiber beam splitter 2-0 to divide the seed laser into M paths;
the laser beam splitter 2 comprises at least two stages of array fiber beam splitters, including a primary fiber beam splitter 2-0 and M secondary fiber beam splitters 2-i, wherein the primary fiber beam splitter 2-0 divides the seed laser into M primary sub lasers, and each secondary fiber beam splitter 2-i divides each sub laser into N secondary sub lasers;
the optical fiber beam splitter 2-0 is provided with 1 input arm and M output arms;
the ith output arm of the optical fiber beam splitter 2-0 is connected with a phase modulator 3-0- (i-1), i is 2, …, M;
each path of laser light split by the optical fiber beam splitter 2-0 is connected into a 1 XN optical fiber beam splitter 2-i, i is 1, …, M;
the fibre splitter 2-i (i ═ 1, …, M) has 1 input arm, N output arms, with typical values of N being 3, 7 and 9;
each output arm of the optical fiber beam splitter 2-i is connected with a phase modulator 3-i-j, i is 1, …, M; j is 2, …, N;
the plurality of phase modulators 3 are divided into at least two-stage arrays including (M-1) or M primary phase modulators and M × N secondary phase modulators 3-i-j; wherein, M or (M-1) primary phase modulators are respectively connected between the primary optical fiber beam splitter and M adjacent secondary optical fiber beam splitters and used for locking M primary sub-laser phases output by the primary optical fiber beam splitter; the M multiplied by N secondary phase modulators are respectively connected to the M multiplied by N laser output ends of the M secondary optical fiber beam splitters and used for locking N secondary sub-laser phases output by the secondary optical fiber beam splitters;
the M multiplied by N secondary phase modulators 3-i-j are respectively connected with an optical fiber amplifier 4 and an optical fiber collimator 5.
The N paths of laser output by the collimator after being amplified and collimated, which are separated by the secondary optical fiber beam splitter 2-i, are subarrays j, j is 2, …, N;
finally forming an array consisting of M multiplied by N lasers, wherein the array comprises M sub-arrays, and each sub-array comprises N lasers;
the laser array is incident on a beam splitter 6. 99% of high-power laser is reflected by the spectroscope 6 and then emitted to an action target; after being split by the spectroscope 6, the < 1% low-power laser carries optical information to enter the array diaphragm 9;
the array diaphragm 9 enables the central light spot of each path of laser to pass through, and blocks off the edge light beam, so that the grouping control of the array light beam piston phase difference is facilitated.
Each sub-array beam passes through an array beam duty ratio compression module 10, which can partially transmit any sub-beam and reduce the distance between sub-beams, and the output sub-array beams 11-i (i is 1, …, M) are arranged more closely.
The array light beam duty ratio compression module 10 comprises at least two stages of array light beam duty ratio compression modules, including M first-stage light beam duty ratio compression modules 10-1 and K second-stage light beam duty ratio compression modules 10-2, dividing the MxN-beam second-stage sub-laser into M first-stage sub-arrays according to the number of the second-stage optical fiber beam splitters, and compressing the M first-stage sub-arrays by the M first-stage light beam duty ratio compression modules respectively; extracting at least one secondary sub-laser from each primary sub-array according to the adjacent relation, forming K secondary sub-laser arrays according to the adjacent relation and the least principle so as to connect all the primary sub-arrays together, and compressing the K sub-laser arrays by K secondary light beam duty ratio compression modules respectively;
the array beam duty ratio compression module 10 has high-precision optical path adjustment capability, and can make the optical path difference of each path of laser light in the module internal transmission process be integral multiple of the wavelength.
Each subarray beam 11-i passing through the primary beam duty ratio compression module 10-1 is followed by a primary phase detection module 7-i respectively comprising (7-1, 7-2, 7-3, 7-4), the working mode of the phase detection module can be referred to and published in intense laser and particle beam, 2012-24(6), 1290 and 1294, the author is: seawao Tao, Zhou Pu, Wang Xiaolin, et al, entitled "high-speed and high-precision phase controller for fiber laser coherent synthesis". The electrical signals output by the primary phase detection modules 7-i are input to primary phase control modules 8-i, i is 1, …, M, and in this embodiment, the primary phase control modules (8-1, 8-2, 8-3, 8-4) are included.
Each primary phase control module 8-i outputs a control signal to N secondary phase modulators 3-i-j of the ith sub-array, where i is 1, …, M; j is 1, …, N. Each sub-array is internally brought into phase. The sub-array, i.e. the first sub-array, may be a linear array, a crossed linear array, a star array, a ring array, or the like.
The phase detection module 7 comprises at least two stages of array phase detection modules; the system comprises M primary phase detection modules 7-i and K secondary phase detection modules 7- (M + K), wherein the M primary phase detection modules 7-i and the K secondary phase detection modules 7- (M + K) specifically comprise (7-5, 7-6 and 7-7); the M primary phase detection modules are used for detecting M primary sub-arrays and respectively feeding back phase difference signals of N secondary sub-lasers in each primary sub-array to the primary phase control module, and the K secondary phase detection modules are used for detecting K secondary sub-arrays and respectively feeding back phase difference signals of more than two secondary sub-lasers in each secondary sub-array to one secondary phase control module;
the phase control module 8 includes:
m primary phase control modules (8-1, 8-2, 8-3 and 8-4) form M multiplied by N phase control signals according to the phase difference signals of the M N secondary sub-lasers, and the M multiplied by N secondary phase control signals are correspondingly input into M multiplied by N secondary phase modulators; locking the phase of the N secondary sub-lasers formed by each secondary optical fiber beam splitter;
k secondary phase control modules (8-5, 8-6 and 8-7) form (M-1) or M phase control signals according to the phase difference signals of the K more than two secondary sub-lasers, and the signals are correspondingly input into (M-1) or M secondary phase modulators; and locking the phase of the M primary sub laser beams formed by each primary optical fiber beam splitter, thereby locking the phase of all the secondary sub laser beams.
Each subarray transmits at least 1 path of laser from the first-stage array beam duty ratio compression module 10-1, and the transmitted laser is in the same phase with other paths of laser in the subarray. The lasers and the lasers transmitted by the adjacent sub-arrays form K new groups of array beams (the number of lasers in each group of array beams is H, and typical values of H are 2 and 3), and the K sub-array beams 12-K (i is 1, …, K) are formed after passing through K secondary array beam duty ratio compression modules 10-2, respectively.
Each array beam 12-K includes (12-1, 12-2, 12-3) followed by a secondary phase detection module 7- (M + K), specifically (7-5, 7-6, 7-7), and the electrical signals output by the secondary phase detection module 7- (M + K) are input to a secondary phase control module 8- (M + K), where K is 1, …, and K includes (8-5, 8-6, 8-7). These secondary phase control modules 8- (M + k) output control signals to the secondary phase modulators 3-0-i, i ═ 1, …, M-1 comprising (3-0-1, 3-0-2, 3-0-3). And the in-phase output of the whole array laser is realized.
As a third embodiment, referring to fig. 4, the primary optical fiber beam splitter, the secondary optical fiber beam splitter, the laser amplifier, the laser collimator, the whole formed by the primary light beam duty ratio compression module and the primary phase detection module, and the whole formed by the secondary light beam duty ratio compression module and the secondary phase detection module are all linear arrays, so that M primary sub-arrays are linear arrays, and N secondary sub-lasers forming the primary sub-arrays are also linear arrays;
each primary subarray is compressed by a primary light beam duty ratio compression module and then sequentially enters a secondary phase modulator through a primary phase detection module and a primary phase control module;
each secondary subarray is compressed by a secondary light beam duty ratio compression module and then sequentially enters a primary phase modulator through a secondary phase detection module and a secondary phase control module;
the whole formed by the secondary light beam duty ratio compression module and the secondary phase detection module is positioned between the whole formed by the two primary light beam duty ratio compression modules adjacent from head to tail and the whole formed by the primary phase detection module.
M-3, N-3, H-2, and K-2. The following controls are performed simultaneously:
(1) the i-th sub-array realizes the in-phase output by using the first-stage phase detection module 7-i and the first-stage phase control module 8-i, wherein i is 1, … and M.
(2) The array beam 12-1 is incident to the phase detection module 7- (M +1), and a control signal of the secondary phase control module 8- (M +1) is output to the phase modulator 3-0-1, so that the in-phase output of the 2 nd sub-array and the 1 st sub-array is realized.
(3) The array beam 12-2 is incident to the phase detection module 7- (M +2), and a control signal of the phase control module 8- (M +2) is output to the phase modulator 3-0-2, so that the in-phase output of the 3 rd sub-array and the 2 nd sub-array is realized. The control realizes the in-phase output of the whole laser alignment.
Preferably, the whole formed by the secondary optical fiber beam splitter, the laser amplifier, the laser collimator, the primary light beam duty ratio compression module and the primary phase detection module is a regular L-shaped array, the regular L-shaped array unit comprises a central point and edge points located around the central point, and the edge points are arranged according to the edges or vertexes of the regular L-shaped array; the M regular L-shaped edge array units are aligned side by side;
each primary subarray is compressed by a primary light beam duty ratio compression module and then sequentially enters a secondary phase modulator through a primary phase detection module and a primary phase control module;
each secondary subarray is compressed by a secondary light beam duty ratio compression module and then sequentially enters a primary phase modulator through a secondary phase detection module and a secondary phase control module;
the whole formed by the secondary light beam duty ratio compression module and the secondary phase detection module is positioned between the whole formed by more than two primary light beam duty ratio compression modules adjacent to each other in edges or adjacent to each other in vertexes and the whole formed by the primary phase detection module.
In a fourth embodiment, referring to fig. 5, the regular L-polygon array includes square array cells; the square array unit comprises a central point and edge points positioned around the central point, wherein the edge points are arranged according to four edges of a square; the M regular L-shaped polygonal array units are arranged according to rows and/or columns;
the whole formed by the secondary light beam duty ratio compression module and the secondary phase detection module is positioned between the whole formed by two to four primary light beam duty ratio compression modules and the primary phase detection module, wherein the two to four primary light beam duty ratio compression modules are adjacent in edge or vertex.
M-9, N-9, H-2, and K-8. The following controls are performed simultaneously:
(1) the i-th sub-array is made to realize an in-phase output, i being 1, …, M, by means of a phase detection module 7-i and a phase control module 8-i.
(2) The array beam 12-1 is incident to the phase detection module 7- (M +1), and a control signal of the phase control module 8- (M +1) is output to the phase modulator 3-0-1, so that the in-phase output of the 2 nd sub-array and the 1 st sub-array is realized.
(3) The array beam 12-2 is incident to the phase detection module 7- (M +2), and a control signal of the phase control module 8- (M +2) is output to the phase modulator 3-0-2, so that the in-phase output of the 3 rd sub-array and the 2 nd sub-array is realized.
(4) The array beam 12-3 is incident to the phase detection module 7- (M +3), and a control signal of the phase control module 8- (M +3) is output to the phase modulator 3-0-3, so that the in-phase output of the 4 th sub-array and the 1 st sub-array is realized.
(5) The array beam 12-4 is incident to the phase detection module 7- (M +4), and a control signal of the phase control module 8- (M +4) is output to the phase modulator 3-0-3, so that the same-phase output of the 5 th sub-array and the 4 th sub-array is realized.
(6) The array beam 12-5 is incident to the phase detection module 7- (M +5), and a control signal of the phase control module 8- (M +5) is output to the phase modulator 3-0-4, so that the in-phase output of the 6 th sub-array and the 5 th sub-array is realized.
(7) The array beam 12-6 is incident to the phase detection module 7- (M +6), and the control signal of the phase control module 8- (M +6) is output to the phase modulator 3-0-5, so that the in-phase output of the 7 th sub-array and the 4 th sub-array is realized.
(8) The array beam 12-7 is incident to the phase detection module 7- (M +7), and a control signal of the phase control module 8- (M +7) is output to the phase modulator 3-0-6, so that the in-phase output of the 8 th sub-array and the 7 th sub-array is realized.
(9) The array light beam 12-8 is incident to the phase detection module 7- (M +8), and a control signal of the phase control module 8- (M +8) is output to the phase modulator 3-0-7, so that the in-phase output of the 9 th sub-array and the 8 th sub-array is realized. The control realizes the in-phase output of the whole laser alignment.
Example v, referring to fig. 6, the regular L-sided polygonal array includes regular hexagonal array cells; the regular hexagon array unit comprises a central point and edge points positioned around the central point, wherein the edge points are arranged according to six edges or six vertexes of the regular hexagon; the M primary sub-arrays are arranged from the center to the edge side by side to form a multilayer structure; the whole formed by the secondary light beam duty ratio compression module and the secondary phase detection module is positioned in the whole center formed by the three primary light beam duty ratio compression modules and the primary phase detection modules, wherein the three primary light beam duty ratio compression modules are adjacent to each other at the top points.
M-7, N-7, H-3, and K-3. The following controls are performed simultaneously:
(1) the i-th sub-array is made to realize an in-phase output, i being 1, …, M, by means of a phase detection module 7-i and a phase control module 8-i.
(2) The array beam 12-1 is incident on the phase detection module 7- (M +1), and a control signal of the phase control module 8- (M +1) is output to the phase modulators 3-0-1 and 3-0-2, so that the 2 nd sub-array and the 3 rd sub-array are output in the same phase as the 1 st sub-array.
(3) The array beam 12-2 is incident on the phase detection module 7- (M +2), and a control signal of the phase control module 8- (M +2) is output to the phase modulators 3-0-3 and 3-0-4, so that the 4 th sub-array and the 5 th sub-array are output in the same phase as the 1 st sub-array.
(4) The array beam 12-3 is incident on the phase detection module 7- (M +3), and the control signal of the phase control module 8- (M +3) is output to the phase modulators 3-0-5 and 3-0-6, so that the 6 th sub-array and the 7 th sub-array are output in the same phase as the 1 st sub-array.
The control realizes the in-phase output of the whole laser alignment.
Example six, see 7 as a variation of example five:
m19, N7, H3, and K9. The following controls are performed simultaneously:
(1) the i-th sub-array is made to realize an in-phase output, i being 1, …, M, by means of a phase detection module 7-i and a phase control module 8-i.
(2) The array beam 12-1 is incident on the phase detection module 7- (M +1), and a control signal of the phase control module 8- (M +1) is output to the phase modulators 3-0-1 and 3-0-2, so that the 2 nd sub-array and the 3 rd sub-array are output in the same phase as the 1 st sub-array.
(3) The array beam 12-2 is incident on the phase detection module 7- (M +2), and a control signal of the phase control module 8- (M +2) is output to the phase modulators 3-0-3 and 3-0-4, so that the 4 th sub-array and the 5 th sub-array are output in the same phase as the 1 st sub-array.
(4) The array beam 12-3 is incident on the phase detection module 7- (M +3), and the control signal of the phase control module 8- (M +3) is output to the phase modulators 3-0-5 and 3-0-6, so that the 6 th sub-array and the 7 th sub-array are output in the same phase as the 1 st sub-array.
(5) The array beam 12-4 is incident on the phase detection module 7- (M +4), and a control signal of the phase control module 8- (M +4) is output to the phase modulators 3-0-7 and 3-0-8, so that the 8 th sub-array, the 9 th sub-array and the 2 nd sub-array are output in the same phase.
(6) The array beam 12-5 is incident on the phase detection module 7- (M +5), and the control signal of the phase control module 8- (M +5) is output to the phase modulators 3-0-9 and 3-0-10, so that the 10 th sub-array, the 11 th sub-array and the 3 rd sub-array are output in the same phase.
(7) The array beam 12-6 is incident on the phase detection module 7- (M +6), and the control signal of the phase control module 8- (M +6) is output to the phase modulators 3-0-11 and 3-0-12, so that the 12 th sub-array, the 13 th sub-array and the 4 th sub-array are output in the same phase.
(8) The array beam 12-7 is incident on the phase detection module 7- (M +7), and the control signal of the phase control module 8- (M +7) is output to the phase modulators 3-0-13 and 3-0-14, so that the 14 th sub-array, the 15 th sub-array and the 5 th sub-array are output in phase.
(9) The array beam 12-8 is incident on the phase detection module 7- (M +8), and the control signal of the phase control module 8- (M +8) is output to the phase modulators 3-0-15 and 3-0-16, so that the 16 th sub-array, the 17 th sub-array and the 6 th sub-array are output in phase.
(10) The array beam 12-9 is incident on the phase detection module 7- (M +9), and the control signal of the phase control module 8- (M +9) is output to the phase modulators 3-0-17 and 3-0-18, so that the 18 th sub-array, the 19 th sub-array and the 7 th sub-array are output in phase. The control realizes the in-phase output of the whole laser alignment.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A coherent combining phase control method for a laser array, comprising:
step 1, performing secondary beam splitting on seed laser through at least two stages of optical fiber beam splitters to form M beams of primary sub laser through the primary optical fiber beam splitter, and forming N beams of secondary sub laser through each beam of primary sub laser through the secondary optical fiber beam splitter;
step 2, after the MxN beams of secondary sub-laser are respectively amplified by the MxN laser amplifiers and collimated by the MxN collimators, part of the secondary sub-laser is reflected to an action target, and the other part of the secondary sub-laser is transmitted;
step 3, dividing the transmitted M multiplied by N secondary sub-lasers into M primary sub-arrays according to the output of M secondary optical fiber beam splitters, compressing each primary sub-array by a primary light beam duty ratio compression module, obtaining phase difference signals of the N secondary sub-lasers in the primary sub-arrays by a primary phase detection module, converting the phase difference signals into phase control signals, and controlling the N secondary sub-lasers output by each secondary optical fiber beam splitter to be output in the same phase;
and 4, extracting at least one secondary sub-laser from each primary subarray according to the adjacent relation, forming K secondary sub-laser arrays according to the adjacent relation and the least principle, connecting all the primary sub-arrays together, enabling each secondary sub-laser array to pass through a secondary light beam duty ratio compression module, obtaining phase difference signals of more than two secondary sub-lasers in the secondary subarrays through a secondary phase detection module, converting the phase difference signals into phase control signals, controlling M primary sub-lasers output by each primary optical fiber beam splitter to be output in the same phase, and enabling all the secondary sub-lasers to be locked in the same phase.
2. The coherent combining phase control method for a laser array according to claim 1, wherein in the step 3:
m primary sub-arrays are linear arrays, and N beams of secondary sub-lasers forming the primary sub-arrays are also linear arrays;
selecting two secondary sub-lasers with the most similar positions in two primary sub-arrays adjacent from head to tail to form a secondary sub-laser array;
n-1 beams of secondary sub-lasers in the primary subarray respectively approach to the secondary sub-lasers positioned in the center of the array in the compression process of the primary beam duty ratio compression module;
and more than two secondary sub-lasers in the secondary sub-array approach to the adjacent junction points of the primary sub-array respectively in the compression process of the secondary light beam duty ratio compression module.
3. The coherent combining phase control method of a laser array according to claim 1, wherein in the step 3:
the N beams of secondary sub-lasers forming the primary sub-array comprise regular L-shaped polygonal array units; the regular L-shaped edge array unit comprises a central point and edge points positioned around the central point, and the edge points are arranged according to the edges or the vertexes of the regular L-shaped edge; the M primary sub-arrays are formed by aligning regular L-shaped edge array units from side to side;
selecting the secondary sub-laser with the most similar position in the adjacent 2-L primary sub-arrays to form a secondary sub-laser array;
n-1 beams of secondary sub-lasers at the edge in the primary subarray in the compression process of the primary beam duty ratio compression module respectively approach to the secondary sub-lasers at the center of the array;
and respectively approaching 2-L beams of secondary sub-lasers in the secondary sub-array to adjacent junction points of the primary sub-array in the compression process of the secondary beam duty ratio compression module.
4. A coherent combining phase control method of a laser array according to claim 3, wherein in the step 3:
the N beams of secondary sub-lasers forming the primary sub-array comprise square array units; the square array unit comprises a central point and edge points positioned around the central point, wherein the edge points are arranged according to four edges of a square; the M primary sub-arrays are arranged in rows and/or columns by the square array according to the alignment of the edges;
selecting the secondary sub-laser with the most similar position in 2-4 adjacent primary sub-arrays to form a secondary sub-laser array;
and respectively approaching 2-4 secondary sub-lasers in the secondary sub-array to adjacent junction points of the primary sub-array in the compression process of the secondary light beam duty ratio compression module.
5. A coherent combining phase control method of a laser array according to claim 3, wherein in the step 3:
the N beams of secondary sub-lasers forming the primary sub-array comprise regular hexagonal array units; the regular hexagon array unit comprises a central point and edge points positioned around the central point, wherein the edge points are arranged according to six edges or six vertexes of the regular hexagon; the M primary sub-arrays are arranged from the center to the edge side by side to form a multilayer structure;
selecting the secondary sub-laser with the most similar position in the adjacent 3 primary sub-arrays to form a secondary sub-laser array;
n-1 beams of secondary sub-lasers at the edge in the primary subarray in the compression process of the primary beam duty ratio compression module respectively approach to the secondary sub-lasers at the center of the array;
and respectively approaching the adjacent junction points of the primary subarray by three beams of secondary sub-lasers in the secondary subarray in the compression process of the secondary beam duty ratio compression module.
6. A coherent combining phase control system for a laser array, comprising:
the array fiber beam splitter comprises at least two stages of array fiber beam splitters, wherein each stage of array fiber beam splitter comprises a primary fiber beam splitter and M secondary fiber beam splitters, the primary fiber beam splitter divides incident seed laser into M primary sub laser beams, and each secondary fiber beam splitter divides each sub laser beam into N secondary sub laser beams;
at least two-stage array phase modulator, including M or M-1 first-stage phase modulators and M x N second-stage phase modulators; the M or M-1 primary phase modulators are respectively connected between the primary optical fiber beam splitter and the M secondary optical fiber beam splitters and used for locking M primary sub-laser phases output by the primary optical fiber beam splitters; the M multiplied by N secondary phase modulators are respectively connected to the M multiplied by N laser output ends of the M secondary optical fiber beam splitters and used for locking N secondary sub-laser phases output by the secondary optical fiber beam splitters;
a plurality of laser amplifiers, the number of which is the same as that of the secondary sub laser beams; for amplifying the secondary sub-laser;
the number of the laser collimators is the same as that of the secondary sub laser beams; for collimating the secondary sub-laser;
the spectroscope is used for reflecting a part of secondary sub laser incident by the laser collimator to an action target and transmitting the other part of secondary sub laser incident by the laser collimator;
the at least two-stage array light beam duty ratio compression module comprises M first-stage light beam duty ratio compression modules and K second-stage light beam duty ratio compression modules, the M multiplied by N second-stage sub-lasers are divided into M first-stage sub-arrays according to the number of the second-stage optical fiber beam splitters, and the M first-stage light beam duty ratio compression modules respectively compress the M first-stage sub-arrays; extracting at least one secondary sub-laser from each primary sub-array according to the adjacent relation, forming K secondary sub-laser arrays according to the adjacent relation and the least principle so as to connect all the primary sub-arrays together, and compressing the K sub-laser arrays by K secondary light beam duty ratio compression modules respectively;
at least two stages of array phase detection modules; the system comprises M primary phase detection modules and K secondary phase detection modules; the M primary phase detection modules are used for detecting M primary sub-arrays and respectively feeding back phase difference signals of N secondary sub-lasers in each primary sub-array to the primary phase control module, and the K secondary phase detection modules are used for detecting K secondary sub-arrays and respectively feeding back phase difference signals of more than two secondary sub-lasers in each secondary sub-array to one secondary phase control module;
the M primary phase control modules form M multiplied by N phase control signals according to the phase difference signals of the M N secondary sub-lasers and correspondingly input the M multiplied by N secondary phase modulators; locking the phase of the N secondary sub-lasers formed by each secondary optical fiber beam splitter;
k secondary phase control modules, which form M or M-1 phase control signals according to the phase difference signals of K more than two secondary sub-lasers and correspondingly input M or M-1 primary phase modulators; and locking the phase of the M primary sub laser beams formed by each primary optical fiber beam splitter, thereby locking the phase of all the secondary sub laser beams.
7. The coherent combining phase control system for laser arrays according to claim 6, wherein the primary fiber splitter, the secondary fiber splitter, the laser amplifier, the laser collimator, the whole formed by the primary beam duty cycle compression module and the primary phase detection module, and the whole formed by the secondary beam duty cycle compression module and the secondary phase detection module are all linear arrays, so that M primary sub-arrays are linear arrays, and N secondary sub-lasers constituting the primary sub-arrays are also linear arrays;
each primary subarray is compressed by a primary light beam duty ratio compression module and then sequentially enters a secondary phase modulator through a primary phase detection module and a primary phase control module;
each secondary subarray is compressed by a secondary light beam duty ratio compression module and then sequentially enters a primary phase modulator through a secondary phase detection module and a secondary phase control module;
the whole formed by the secondary light beam duty ratio compression module and the secondary phase detection module is positioned between the whole formed by the two primary light beam duty ratio compression modules adjacent from head to tail and the whole formed by the primary phase detection module.
8. The coherent combining phase control system of claim 6, wherein the secondary fiber splitter, the laser amplifier, the laser collimator, the primary beam duty cycle compression module, and the primary phase detection module form a whole that is a regular L-shaped polygonal array, the regular L-shaped polygonal array unit includes a central point and edge points located around the central point, and the edge points are arranged according to the sides or vertices of the regular L-shaped polygonal; the M regular L-shaped edge array units are aligned side by side;
each primary subarray is compressed by a primary light beam duty ratio compression module and then sequentially enters a secondary phase modulator through a primary phase detection module and a primary phase control module;
each secondary subarray is compressed by a secondary light beam duty ratio compression module and then sequentially enters a primary phase modulator through a secondary phase detection module and a secondary phase control module;
the whole formed by the secondary light beam duty ratio compression module and the secondary phase detection module is positioned between the whole formed by more than two primary light beam duty ratio compression modules adjacent to each other in edges or adjacent to each other in vertexes and the whole formed by the primary phase detection module.
9. The coherent combining phase control system of claim 8, wherein the regular L-polygon array comprises square array elements; the square array unit comprises a central point and edge points positioned around the central point, wherein the edge points are arranged according to four edges of a square; the M regular L-shaped polygonal array units are arranged according to rows and/or columns;
the whole formed by the secondary light beam duty ratio compression module and the secondary phase detection module is positioned between the whole formed by two to four primary light beam duty ratio compression modules and the primary phase detection module, wherein the two to four primary light beam duty ratio compression modules are adjacent in edge or vertex.
10. The coherent combining phase control system of claim 8, wherein the regular L-gon array comprises regular hexagonal array elements; the regular hexagon array unit comprises a central point and edge points positioned around the central point, wherein the edge points are arranged according to six edges or six vertexes of the regular hexagon; the M primary sub-arrays are arranged from the center to the edge side by side to form a multilayer structure;
the whole formed by the secondary light beam duty ratio compression module and the secondary phase detection module is positioned in the whole center formed by the three primary light beam duty ratio compression modules and the primary phase detection modules, wherein the three primary light beam duty ratio compression modules are adjacent to each other at the top points.
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| CN112164973B (en) * | 2020-10-12 | 2021-08-27 | 中国人民解放军国防科技大学 | Phase control system and method for realizing orbital angular momentum light beam mode switching |
| CN112332205B (en) * | 2020-11-06 | 2022-08-19 | 中国人民解放军国防科技大学 | Optical interference imaging-based coherent combining system of transmitting-receiving integrated fiber laser array |
| CN112290371B (en) * | 2021-01-04 | 2021-03-19 | 中国工程物理研究院激光聚变研究中心 | Laser beam combining system based on square optical fiber beam combiner |
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