Line width control method and system of laser
By acquiring laser beam information and phase modulation parameter set, and using functional relationships to calculate modulation depth, the problems of difficult selection of laser beam modulator and low control accuracy are solved, achieving better linewidth compression and noise suppression effects.
Patent Information
- Application Number
- CN202511584102.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2026-01-30
AI Technical Summary
In existing technologies, the relationship between the modulation depth and voltage of laser beam modulators cannot be determined, leading to difficulties in selection, low control accuracy, narrow applicability, and an inability to effectively narrow linewidth and suppress noise.
By acquiring the laser beam information set of the initial laser and the phase modulation parameter set of the phase modulator, the modulation depth of the modulator is calculated using functional relationships, so as to process the sidebands of the laser beam.
It achieves precise control of the modulation depth of the laser beam modulator, improves the modulation effect, and enhances the linewidth compression and noise suppression capabilities.
Smart Images
Figure CN121440343A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optical detection technology, and in particular to a method and system for controlling the linewidth of a laser. Background Technology
[0002] In the field of laser technology, laser beam modulators (such as phase modulators and intensity modulators) are often used to actively control the laser in order to narrow linewidth, suppress noise, or generate optical signals of specific formats. Modulation depth is one of the most critical technical parameters determining the modulation effect. For example, in linewidth compression techniques based on phase modulation, the modulation depth directly determines the noise suppression effect and the amplitude of the generated sidebands. An inappropriate modulation depth will lead to poor linewidth compression and may even introduce additional noise.
[0003] In existing technologies, the typical process for configuring and using a laser beam modulator is as follows: first, a modulator is selected based on general application requirements (such as modulation type and speed), and then one or more fixed operating voltages are preset for its drive circuit. However, this method has a fundamental drawback: existing technologies require pre-configured laser beam modulators, but cannot specify the relationship between the modulation depth and voltage, thus making it impossible to determine a suitable laser beam modulator for adjusting the laser beam. This leads to problems such as difficulty in modulator selection, low control accuracy, and narrow applicability. Summary of the Invention
[0004] The purpose of this invention is to provide a method for controlling the linewidth of a laser, which selects a suitable function to calculate the modulation depth of the modulator, so as to facilitate the processing of the sidebands of the laser beam.
[0005] According to a first aspect of the present invention, a method for controlling the linewidth of a laser is provided, the method comprising the following steps: Obtain the laser beam information set A = {A1, A2, ..., A...} of the initial laser. i , ..., A m}, A i It is the information of the i-th initial laser beam of the initial laser, where the value of i ranges from 1 to m, and m is the number of initial laser beams; Obtain the initial phase modulation parameter set B = {B1, B2, ..., B} of the phase modulator. j , ..., B n}, B j It is the j-th phase modulation parameter of the initial phase modulator, where j ranges from 1 to n, and n is the number of phase modulation parameters of the initial modulator; Based on A and B, the target phase modulation parameters are obtained.
[0006] Specifically, in the step of obtaining the laser beam information set of the initial laser, the i-th initial laser beam information A i = (A i1 A i2 A i3 A i1 A is the amplitude of the i-th initial laser beam. i2 A is the angular frequency of the i-th initial laser beam. i3 It is the initial phase of the i-th initial laser beam.
[0007] Specifically, in the step of obtaining the initial phase modulation parameter set of the phase modulator, the j-th phase modulation parameter B j = (B j1 B j2 B j3 ), B j1 B is the first modulation depth of the j-th phase modulation parameter. j2 B is the second modulation depth of the j-th phase modulation parameter. j3 It is the third modulation depth of the j-th phase modulation parameter.
[0008] Specifically, all first modulation depths, all second modulation depths, and all third modulation depths are obtained through voltage.
[0009] Specifically, B j1 The following conditions must be met: B j1 =f1(V j f1() is the first proportional function, where V j It is the j-th voltage.
[0010] Specifically, B j1 =a×V j +b, where the first parameter a > 0 and the intercept b > 0.
[0011] Specifically, B j2 =f2(V j f2() is the second proportional function, where V j It is the j-th voltage.
[0012] Specifically, B j2 =c×e Vj The second parameter is c, and c > 0.
[0013] Specifically, B j3 The following conditions must be met: B j3 =f3(V j f3() is the third proportional function, where V j It is the j-th voltage.
[0014] Specifically, Bj2 =log d Vj The third parameter is d and d > 1.
[0015] This invention also protects a linewidth control system for a laser, the system comprising: The first acquisition module is used to acquire the laser beam information set A={A1, A2, ..., A...} of the initial laser. i , ..., A m}, A i It is the information of the i-th initial laser beam of the initial laser, where the value of i ranges from 1 to m, and m is the number of initial laser beams; The second acquisition module is used to acquire the phase modulation parameter set B={B1, B2, ..., B} of the initial phase modulator. j , ..., B n}, B j It is the j-th phase modulation parameter of the initial phase modulator, where j ranges from 1 to n, and n is the number of phase modulation parameters of the initial modulator; The third acquisition module is used to obtain the target phase modulation parameters based on A and B.
[0016] Compared with the prior art, the invention has at least the following beneficial effects: This invention provides a method for controlling the linewidth of a laser, the method comprising the following steps: obtaining an initial laser beam information set A = {A1, A2, ..., A...} of the laser. i , ..., A m}, A i This is the information of the i-th initial laser beam from the initial laser, where i ranges from 1 to m, and m is the number of initial laser beams; the phase modulation parameter set B = {B1, B2, ..., B...} of the initial phase modulator is obtained. j , ..., B n}, B j It is the j-th phase modulation parameter of the initial phase modulator, where j ranges from 1 to n, and n is the number of phase modulation parameters of the initial modulator; according to A and B, the target phase modulation parameter is obtained; it can be seen that a suitable function is selected to calculate the modulation depth of the modulator, so as to process the sidebands of the laser beam. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a flowchart of a laser linewidth control method provided in Embodiment 1 of the present invention. Detailed Implementation
[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0020] Example 1: like Figure 1 As shown, this embodiment provides a method for controlling the linewidth of a laser, the method comprising the following steps: Obtain the laser beam information set A = {A1, A2, ..., A...} of the initial laser. i , ..., A m}, A i It is the information of the i-th initial laser beam of the initial laser, where the value of i ranges from 1 to m, and m is the number of initial laser beams; Obtain the initial phase modulation parameter set B = {B1, B2, ..., B} of the phase modulator. j , ..., B n}, B j It is the j-th phase modulation parameter of the initial phase modulator, where j ranges from 1 to n, and n is the number of phase modulation parameters of the initial modulator; Based on A and B, the target phase modulation parameters are obtained.
[0021] Specifically, in the step of obtaining the laser beam information set of the initial laser, the i-th initial laser beam information A i = (A i1 A i2 A i3 A i1 A is the amplitude of the i-th initial laser beam. i2 A is the angular frequency of the i-th initial laser beam. i3 It is the initial phase of the i-th initial laser beam.
[0022] Specifically, in the step of obtaining the initial phase modulation parameter set of the phase modulator, the j-th phase modulation parameter B j = (B j1 B j2 B j3 ), B j1 B is the first modulation depth of the j-th phase modulation parameter. j2 B is the second modulation depth of the j-th phase modulation parameter.j3 It is the third modulation depth of the j-th phase modulation parameter.
[0023] Furthermore, all the first modulation depths, all the second modulation depths, and all the third modulation depths are obtained through voltage.
[0024] Furthermore, B j1 The following conditions must be met: B j1 =f1(V j f1() is the first proportional function, where V j It is the j-th voltage. Further understanding: B j1 =a×V j +b, where the first parameter a > 0 and the intercept b > 0; Furthermore, B j2 The following conditions must be met: B j2 =f2(V j f2() is the second proportional function. Further understanding: B j2 =c×e Vj The second parameter is c, and c > 0; Furthermore, B j3 The following conditions must be met: B j3 =f3(V j f3() is the third proportional function. Further understanding: B j2 =log d Vj The third parameter is d and d > 1; Among them, f1(), f2() and f3() are different.
[0025] Specifically, the steps for obtaining the target phase modulation parameters based on A and B also include the following steps: Based on A, the initial electric field E = {E1, E2, ..., E} corresponding to A is obtained. i , ..., E m}, E i It is A i The corresponding initial electric field, where E i =A i1 ×cos(A) i2 +A i3 ); Based on E, obtain the intermediate modulation electric field group E corresponding to E. 0 ={E 0 1, E 0 2, ..., E 0 i , ..., E 0 m}, E 0 i It is Ai The corresponding intermediate modulation electric field group, where E 0 i =(E 0 i1 E 0 i2 , ..., E 0 ij , ..., E 0 in ), where E 0 ij =(E 01 ij E 02 ij E 03 ij ); Furthermore, E 01 ij The following conditions must be met: E 01 ij =A i1 ×{J0(B j1 )×cos(A i2 )+J1(B j1 )×[cos(A i2 +D j )-cos(A i2 -D j )]}; Furthermore, E 02 ij The following conditions must be met: E 02 ij =A i1 ×{J0(B j2 )×cos(A i2 )+J1(B j2 )×[cos(A i2 +D j )-cos(A i2 -D j )]}; Furthermore, E 03 ij The following conditions must be met: E 03 ij =A i1 ×{J0(B j3 )×cos(A i2 )+J1(B j3 )×[cos(A i2 +D j )-cos(A i2 -Dj )]}; According to E and E 0 The target phase modulation parameters are obtained.
[0026] Furthermore, based on E and E 0 The steps to obtain the target phase modulation parameters also include the following: According to E i and E 0 i , obtain E i The corresponding initial difference set G i ={G i1 G i2 , ..., G ij , ..., G in}, G ij =(G 1 ij G 2 ij G 3 ij ); Among them, G 1 ij G meets the following conditions: 1 ij =|E 01 ij -E i |; Among them, G 2 ij G meets the following conditions: 2 ij =|E 02 ij -E i |; Among them, G 3 ij G meets the following conditions: 3 ij =|E 03 ij -E i |; Get G i The corresponding intermediate difference set G 0 i =(G 0 i1 G 0 i2 G 0 i3 ), G 0 i1 =(G 1 i1 , ..., G 1ij , ..., G 1 in ), G 0 i2 =(G 2 i1 , ..., G 2 ij , ..., G 2 in ), G 0 i3 =(G 3 i1 , ..., G 3 ij , ..., G 3 in ); According to G 0 i Get G 0 i The corresponding intermediate priority group F i F i =(F i1 F i2 F i3 ), Among them, F i1 The following conditions must be met: ; Among them, F i2 The following conditions must be met: ; Among them, F i3 The following conditions must be met: ; According to the first priority group F 0 1 = (F) 11 , ..., F i1 , ..., F m1 ), second priority group F 0 2 = (F) 12 , ..., F i2 , ..., F m2 ) and the third priority group F 0 3 = (F) 13 , ..., F i3 , ..., F m3 ), get F 0 1 corresponds to the first target priority, F 0 The second objective priority corresponding to 2 and F 0 The third objective priority corresponds to 3; Among them, F 0 1. Meets the following conditions: ; Among them, F 02. Meets the following conditions: ; Among them, F 0 3. Meets the following conditions: ; Select min(F) 0 1, F 0 2, F 0 3) The corresponding modulation depth is used as the target phase modulation parameter.
[0027] In summary, this embodiment provides a laser linewidth control method, which includes the following steps: obtaining an initial laser beam information set A = {A1, A2, ..., A...} i , ..., A m}, A i This is the information of the i-th initial laser beam from the initial laser, where i ranges from 1 to m, and m is the number of initial laser beams; the phase modulation parameter set B = {B1, B2, ..., B...} of the initial phase modulator is obtained. j , ..., B n}, B j It is the j-th phase modulation parameter of the initial phase modulator, where j ranges from 1 to n, and n is the number of phase modulation parameters of the initial modulator; according to A and B, the target phase modulation parameter is obtained; it can be seen that a suitable function is selected to calculate the modulation depth of the modulator, so as to process the sidebands of the laser beam.
[0028] Example 2 This second embodiment provides a linewidth control system for a laser, the system comprising: The first acquisition module is used to acquire the laser beam information set A={A1, A2, ..., A...} of the initial laser. i , ..., A m}, A i It is the information of the i-th initial laser beam of the initial laser, where the value of i ranges from 1 to m, and m is the number of initial laser beams; The second acquisition module is used to acquire the phase modulation parameter set B={B1, B2, ..., B} of the initial phase modulator. j , ..., B n}, B j It is the j-th phase modulation parameter of the initial phase modulator, where j ranges from 1 to n, and n is the number of phase modulation parameters of the initial modulator; The third acquisition module is used to obtain the target phase modulation parameters based on A and B.
[0029] Specifically, in the first acquisition module, the information A of the i-th initial laser beam... i = (A i1 Ai2 A i3 A i1 A is the amplitude of the i-th initial laser beam. i2 A is the angular frequency of the i-th initial laser beam. i3 It is the initial phase of the i-th initial laser beam.
[0030] Specifically, in the second acquisition module, the j-th phase modulation parameter B j = (B j1 B j2 B j3 ), B j1 B is the first modulation depth of the j-th phase modulation parameter. j2 B is the second modulation depth of the j-th phase modulation parameter. j3 It is the third modulation depth of the j-th phase modulation parameter.
[0031] Furthermore, all the first modulation depths, all the second modulation depths, and all the third modulation depths are obtained through voltage.
[0032] Furthermore, B j1 The following conditions must be met: B j1 =f1(V j f1() is the first proportional function, where V j It is the j-th voltage. Further understanding: B j1 =a×V j +b, where the first parameter a > 0 and the intercept b > 0; Furthermore, B j2 The following conditions must be met: B j2 =f2(V j f2() is the second proportional function. Further understanding: B j2 =c×e Vj The second parameter is c, and c > 0; Furthermore, B j3 The following conditions must be met: B j3 =f3(V j f3() is the third proportional function. Further understanding: B j2 =log d Vj The third parameter is d and d > 1; Among them, f1(), f2() and f3() are different.
[0033] Specifically, the third acquisition module includes: The fourth acquisition module is used to obtain the initial electric field E={E1, E2, ..., E...} corresponding to A. i , ..., E m}, E i It is A i The corresponding initial electric field, where E i =A i1 ×cos(A) i2 +A i3 ); The fifth acquisition module is used to acquire the intermediate modulation electric field group E corresponding to E based on E. 0 ={E 0 1, E 0 2, ..., E 0 i , ..., E 0 m}, E 0 i It is A i The corresponding intermediate modulation electric field group, where E 0 i =(E 0 i1 E 0 i2 , ..., E 0 ij , ..., E 0 in ), where E 0 ij =(E 01 ij E 02 ij E 03 ij ); Furthermore, E 01 ij The following conditions must be met: E 01 ij =A i1 ×{J0(B j1 )×cos(A i2 )+J1(B j1 )×[cos(A i2 +D j )-cos(A i2 -D j )]}; Furthermore, E 02 ij The following conditions must be met: E 02 ij =A i1 ×{J0(B j2 )×cos(A i2 )+J1(B j2 )×[cos(Ai2 +D j )-cos(A i2 -D j )]}; Furthermore, E 03 ij The following conditions must be met: E 03 ij =A i1 ×{J0(B j3 )×cos(A i2 )+J1(B j3 )×[cos(A i2 +D j )-cos(A i2 -D j )]}; The sixth acquisition module is used to obtain data based on E and E'. 0 The target phase modulation parameters are obtained.
[0034] Furthermore, the sixth acquisition module includes: The first execution module is used to execute E. i and E 0 i , obtain E i The corresponding initial difference set G i ={G i1 G i2 , ..., G ij , ..., G in}, G ij =(G 1 ij G 2 ij G 3 ij ); Among them, G 1 ij G meets the following conditions: 1 ij =|E 01 ij -E i |; Among them, G 2 ij G meets the following conditions: 2 ij =|E 02 ij -E i |; Among them, G 3 ij G meets the following conditions: 3 ij =|E03 ij -E i |; The second execution module is used to obtain G. i The corresponding intermediate difference set G 0 i =(G 0 i1 G 0 i2 G 0 i3 ), G 0 i1 =(G 1 i1 , ..., G 1 ij , ..., G 1 in ), G 0 i2 =(G 2 i1 , ..., G 2 ij , ..., G 2 in ), G 0 i3 =(G 3 i1 , ..., G 3 ij , ..., G 3 in ); The third execution module is used to determine the execution order based on G. 0 i Get G 0 i The corresponding intermediate priority group F i F i =(F i1 F i2 F i3 ), Among them, F i1 The following conditions must be met: ; Among them, F i2 The following conditions must be met: ; Among them, F i3 The following conditions must be met: ; The fourth execution module is used to determine the priority group F. 0 1 = (F) 11 , ..., F i1 , ..., F m1 ), second priority group F 02 = (F) 12 , ..., F i2 , ..., F m2 ) and the third priority group F 0 3 = (F) 13 , ..., F i3 , ..., F m3 ), get F 0 1 corresponds to the first target priority, F 0 The second objective priority corresponding to 2 and F 0 The third objective priority corresponds to 3; Among them, F 0 1. Meets the following conditions: ; Among them, F 0 2. Meets the following conditions: ; Among them, F 0 3. Meets the following conditions: ; The fifth execution module is used to select min(F) 0 1, F 0 2, F 0 3) The corresponding modulation depth is used as the target phase modulation parameter.
[0035] While specific embodiments of the invention have been described in detail by way of example, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. It should also be understood that various modifications can be made to the embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims
1. A method of linewidth control of a laser, characterized by, The method comprises the following steps: An initial laser beam information set A={A1, A2, …, Am} of the initial laser is acquired, where A1, A2, …, and Am are the first, second, and mth initial laser beam information of the initial laser, respectively, and m is the number of the initial laser beam information. i ,……,A m},A i is the i-th initial laser beam information of the initial laser, i ranges from 1 to m, and m is the number of initial laser beam information. acquire a phase modulation parameter set B = {B1, B2, …, Bn} of the initial phase modulator, Bj is the jth phase modulation parameter of the initial phase modulator, j ranges from 1 to n, and n is the number of phase modulation parameters of the initial modulator j , …, B n n} of the initial phase modulator, Bj is the jth phase modulation parameter of the initial phase modulator, j ranges from 1 to n, and n is the number of phase modulation parameters of the initial modulator j According to A and B, the target phase modulation parameter is acquired.
2. The method of line width control of a laser according to claim 1, wherein, In the step of acquiring the initial laser beam information set of the laser, the i-th initial laser beam information A i = (A i1 , A i2 , A i3 ), A i1 is the i-th initial laser beam amplitude, A i2 is the angular frequency of the i-th initial laser beam, and A i3 is the initial phase of the i-th initial laser beam.
3. The method of line width control of a laser according to claim 1, wherein In the step of acquiring the phase modulation parameter set of the initial phase modulator, the jth phase modulation parameter B j = (B j1 , B j2 , B j3 ), B j1 is the first modulation depth of the jth phase modulation parameter, B j2 is the second modulation depth of the jth phase modulation parameter, and B j3 is the third modulation depth of the jth phase modulation parameter.
4. The method of line width control of a laser according to claim 3, wherein All the first modulation depths, all the second modulation depths and all the third modulation depths are acquired by voltage.
5. The method of line width control of a laser according to claim 4, wherein B j1 meets the condition: B j1 = f1(V j ), f1() is a first proportional function, wherein, V j is the jth voltage.
6. The method of line width control of a laser according to claim 5, wherein B j1 =a×V j +b, the first parameter a > 0 and the intercept b > 0.
7. The method of line width control of a laser according to claim 4, wherein B j2 = f2(V j ), f2() is a second proportional function, where V j is the jth voltage.
8. The method of line width control of a laser according to claim 7, wherein, B j2 = c x e Vj , a second parameter c and c > 0.
9. The method of line width control of a laser according to claim 4, wherein, B j3 B j3 =f3(V j ), f3() is a third proportional function, where V j is the jth voltage.
10. The method of line width control of a laser according to claim 9, wherein, B j2 = log d Vj , a third parameter d and d > 1.
11. A linewidth control system for a laser, characterized by, The system comprises: The first acquisition module is configured to acquire a set A={A1, A2,..., Am} of initial laser beam information of an initial laser, where Ai is the i-th initial laser beam information of the initial laser, i ranges from 1 to m, and m is the number of initial laser beam information. i ,..., Am m} of initial laser beam information of an initial laser, where Ai is the i-th initial laser beam information of the initial laser, i ranges from 1 to m, and m is the number of initial laser beam information. i The second acquisition module is used to acquire the phase modulation parameter set B={B1, B2, ..., B} of the initial phase modulator. j , ..., B n }, B j It is the j-th phase modulation parameter of the initial phase modulator, where j ranges from 1 to n, and n is the number of phase modulation parameters of the initial modulator; The third acquisition module is configured to acquire the target phase modulation parameter according to A and B.