Large-aperture optical element aplanatism adjustment method based on angle multiplexing

Abstract

According to the large-aperture optical element aplanatism adjustment method based on angle multiplexing, a reflecting mirror TM1, a reflecting mirror TM2 and a reflecting mirror TM3 are included, laser beams are sequentially transmitted along the geometric centers of the light facing faces of the TM1, the TM2 and the TM3, and aplanatism adjustment is achieved by adjusting the installation angle theta1 of the TM1, the installation position of the TM2 and the installation angle theta2. The method is easy to implement and convenient to adjust, optical elements are saved, and the method is particularly suitable for equal-optical-path adjustment of large-aperture optical elements represented by a target range transmission section of a high-power laser driver and the like.

Description

Technical Field

[0001] The present invention belongs to the field of high energy laser application, and specifically is an equal optical path adjustment method for large aperture optical elements based on angle multiplexing, and is particularly suitable for equal optical path adjustment of large aperture optical elements represented by the transmission section of a high power laser driver target range. Background Art

[0002] Driven by the development needs of inertial confinement fusion and high-energy physics, high-power laser drivers are gradually developing in the direction of high energy and high repetition frequency. However, the damage threshold of large-aperture transmission optical elements in the target range is very limited and must operate at medium and low flux density. Therefore, in order to resolve the contradiction between the high-energy output of the main amplifier section and the limited damage threshold of the optical elements in the target range, a beam splitter is used at the output end of the main amplifier section to perform high-flux fundamental frequency splitting, dividing the high-flux laser output by the main amplifier section into two, and doubling the number of target range lasers to achieve safe operation of medium and low flux of large-aperture optical elements in the target range, and ensure that the high-flux laser generated by the main amplifier section is injected into the terminal target sphere through frequency doubling to reduce energy waste.

[0003] However, due to the use of the beam splitter, pulse generation, as well as equal optical path adjustment of the pre-release and main release sections, become ineffective for the two paths that are divided into two. In addition, the large-aperture optical components required for the target range section not only have high technical barriers, but are also extremely expensive. Any performance degradation or damage caused by optical path mismatch will result in significant economic losses. Therefore, under the current technical system, how to achieve equal optical path adjustment of large-aperture optical components in the target range section in an efficient, simple and cost-controlled manner has become a major bottleneck restricting the performance improvement and widespread application of high-power laser drivers. There is an urgent need to develop an innovative solution that can maintain the optical performance of the system while significantly reducing operational complexity and economic burden. Summary of the invention

[0004] The purpose of the present invention is to solve the above existing problems and provide an optical path adjustment method for large-aperture optical elements based on angle multiplexing, which ensures that the optical path of each path of the laser beam remains consistent after passing through a series of reflectors by adjusting the installation position and angle of the reflector. This method is particularly suitable for high-power laser systems, especially those that need to transmit lasers between large-aperture optical elements while avoiding energy loss and performance degradation caused by optical path differences.

[0005] The technical solution of the present invention is as follows:

[0006] A method for adjusting equal optical path of a large-aperture optical element based on angle multiplexing, wherein the method comprises a plane reflector TM1, a plane reflector TM2 and a plane reflector TM3, wherein the laser beam is transmitted in sequence along the geometric center of the light-facing surface of TM1, TM2 and TM3, and the initial beam center distance between TM1 and TM2 is L 12, the initial beam center distance between TM2 and TM3 is L 23 , the initial optical path L between TM1 and TM3 13 =L 12 +L 23 , the initial installation angles of TM1, TM2 and TM3 are θ1, θ2 and θ3 respectively. Under the premise of keeping the incident light direction and installation position of TM1, and the installation position and installation angle θ3 of TM3 unchanged, the optical path from TM1 to TM3 is increased or decreased by adjusting the installation angle θ1 of TM1, the installation position and installation angle θ2 of TM2.

[0007] TM2 moves along the direction of its initial reflected light;

[0008] When TM2 moves ΔL along the direction of its initial reflected light 23 When approaching TM3, the new incident angles of TM1 and TM2 are θ 1new ,θ 2new , and the optical path length change between TM1 and TM3 ΔL 13 They are:

[0009]

[0010] When TM2 moves ΔL along the direction of its initial reflected light 23 When moving away from TM3, the new incident angles of TM1 and TM2 are θ 1new ,θ 2new , and the optical path length change between TM1 and TM3 ΔL 13 They are:

[0011]

[0012] When the initial angle of TM2 is θ2 = 45° and TM2 moves ΔL along the direction of its initial reflected light 23 When approaching TM3, the new incident angles of TM1 and TM2 are θ 1new ,θ 2new , and the optical path length change between TM1 and TM3 ΔL 13 They are:

[0013]

[0014]

[0015] When the initial angle of TM2 is θ2 = 45° and TM2 moves ΔL along the direction of its initial reflected light 23 When moving away from TM3, the new incident angles of TM1 and TM2 are θ 1new ,θ 2new , and the optical path length change between TM1 and TM3 ΔL13 They are:

[0016]

[0017] The plane formed by the incident and reflected rays of TM2 may or may not be coplanar with the incident ray of TM1;

[0018] The plane formed by the incident and reflected light of TM2 may be coplanar with the reflected light of TM3 or may not be coplanar.

[0019] Compared with the prior art, the technical effects of the present invention are:

[0020] 1) Relying on the large-aperture optical elements of the original optical path, the number of optical elements is not increased, and the precise control of the laser optical path is achieved by adjusting the installation angle and position of the plane mirrors TM1, TM2 and TM3. There is no need to change the physical size of the optical elements or introduce additional optical elements, thereby reducing system complexity and cost.

[0021] 2) The special geometric relationship that the plane composed of the incident and reflected light of TM2 is coplanar with the incident light of TM1, and the plane composed of the incident and reflected light of TM2 is perpendicular to the reflected light of TM3 is utilized to ensure the stability and accuracy of the light beam during transmission and avoid unnecessary deflection or scattering. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the equal optical path adjustment principle of large-aperture optical elements based on angle multiplexing;

[0023] Figure 2 Example 1 - Schematic diagram of equal optical path adjustment of a single beam A section in a target range transmission section of a laser device;

[0024] Figure 3 Example 2 - Schematic diagram of equal optical path adjustment of a single beam B segment in a target range transmission section of a laser device; DETAILED DESCRIPTION

[0025] The present invention is described in detail below by way of examples, but the protection scope of the present invention should not be limited thereto.

[0026] Example 1

[0027] See also Figure 2 , a certain laser beam section A of a target transmission section of a high-power laser device, an equal optical path adjustment method of a large-aperture optical element based on angle multiplexing, characterized in that it includes a plane reflector TM1, a plane reflector TM2 and a plane reflector TM3, the laser beam is transmitted in sequence along the geometric center of the light-facing surface of TM1, TM2 and TM3, and the initial beam center distance between TM1 and TM2 is L 12=1513.8mm, the initial beam center distance between TM2 and TM3 is L 23 =12603.2mm, initial optical path L between TM1 and TM3 13 =L 12 +L 23 =14117mm, the initial installation angles θ1, θ2 and θ3 of TM1, TM2 and TM3 are all 45°. Under the premise of keeping the incident light direction and installation position of TM1, and the installation position and installation angle θ3 of TM3 unchanged, the optical path from TM1 to TM3 is increased or decreased by adjusting the installation angle θ1 of TM1, the installation position and installation angle θ2 of TM2. When ΔL 23 =50mm (away from TM3), the new incident angles θ of TM1 and TM2 1new ,θ 2new , and the optical path length change between TM1 and TM3 ΔL 13 They are: 45.95°, 44.05°, 50.83mm respectively.

[0028] The plane formed by the incident and reflected light of TM2 is coplanar with the incident light of TM1; the plane formed by the incident and reflected light of TM2 is perpendicular to the reflected light of TM3.

[0029] Example 2

[0030] See also Figure 3 , a laser beam B section of a high-power laser device target transmission segment, an equal optical path adjustment method of a large-aperture optical element based on angle multiplexing, characterized in that it includes a plane reflector TM1, a plane reflector TM2 and a plane reflector TM3, the laser beam is transmitted in sequence along the geometric center of the light-facing surface of TM1, TM2 and TM3, and the initial beam center distance between TM1 and TM2 is L 12 =10912.9mm, the initial beam center distance between TM2 and TM3 is L 23 =5773.1mm, initial optical path L between TM1 and TM3 13 =L 12 +L 23 =16686mm, the initial installation angles θ1, θ2 and θ3 of TM1, TM2 and TM3 are all 45°. Under the premise of keeping the incident light direction and installation position of TM1, and the installation position and installation angle θ3 of TM3 unchanged, the optical path from TM1 to TM3 is increased or decreased by adjusting the installation angle θ1 of TM1, the installation position and installation angle θ2 of TM2. When ΔL 23 =50mm (away from TM3), the new incident angles θ of TM1 and TM2 1new ,θ 2new , and the optical path length change between TM1 and TM3 ΔL 13They are: 45.13°, 44.87°, 50.11mm respectively.

[0031] The plane formed by the incident and reflected light of TM2 is coplanar with the incident light of TM1;

[0032] The plane composed of the incident and reflected light of TM2 and the reflected light of TM3 are both perpendicular.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for adjusting equal optical path length of large-aperture optical elements based on angle multiplexing, characterized in that: include: The laser beam is transmitted in sequence along the geometric centers of the light-facing surfaces of the first plane reflector TM1, the second plane reflector TM2 and the third plane reflector TM3; Assume that the initial beam center distance L between the first plane reflector TM1 and the second plane reflector TM2 is 12 , the initial beam center distance L between the second plane reflector TM2 and the third plane reflector TM3 23 , then the optical path L between the first plane reflector TM1 and the third plane reflector TM3 13 , L 13 =L 12 +L 23 ; Assume that the initial installation angles of the first plane reflector TM1, the second plane reflector TM2 and the third plane reflector TM3 are θ1, θ2 and θ3 respectively; The incident light direction and installation position of the first plane reflector TM1, as well as the installation position and installation angle θ3 of the third plane reflector TM3 are kept unchanged, and the optical path between the first plane reflector TM1 and the third plane reflector TM3 is adjusted by adjusting the installation angle of the first plane reflector TM1 and the installation position and installation angle of the second plane reflector TM2.

2. The method for adjusting equal optical path length of large-aperture optical elements based on angle multiplexing according to claim 1, characterized in that: Keep the incident light direction and installation position of the first plane reflector TM1, and the installation position and installation angle θ3 of the third plane reflector TM3 unchanged, and move the second plane reflector TM2 along its initial reflected light direction by ΔL 23 : When ΔL 23 When the first plane reflector TM1 is close to the third plane reflector TM3, the installation angle θ of the first plane reflector TM1 is adjusted. 1new , the installation position and installation angle θ of the second plane reflector TM2 2new The following conditions must be met: Then the optical path change between the first plane reflector TM1 and the third plane reflector TM3 becomes ΔL 13 for: When ΔL 23 When the first plane reflector TM1 is away from the third plane reflector TM3, the installation angle θ of the first plane reflector TM1 is adjusted. 1new , the installation position and installation angle θ of the second plane reflector TM2 2new The following conditions must be met: Then the optical path change between the first plane reflector TM1 and the third plane reflector TM3 becomes ΔL 13 for 3. The method for adjusting equal optical path length of large-aperture optical elements based on angle multiplexing according to claim 1, characterized in that: When the initial incident angle of TM2 is θ2 = 45° and TM2 moves ΔL along the direction of its initial reflected light 23 When approaching TM3, the new incident angles of TM1 and TM2 are θ 1new ,θ 2new , and the optical path length change between TM1 and TM3 ΔL 13 They are:

4. The method for adjusting equal optical path length of large-aperture optical elements based on angle multiplexing according to claim 1, characterized in that: When the initial incident angle of TM2 is θ2 = 45° and TM2 moves ΔL along the direction of its initial reflected light 23 When moving away from TM3, the new incident angles of TM1 and TM2 are θ 1new ,θ 2new , and the optical path length change between TM1 and TM3 ΔL 13 They are:

5. The method for adjusting equal optical path length of large-aperture optical elements based on angle multiplexing according to any one of claims 1 to 4, characterized in that: The plane formed by the incident and reflected light of the second plane reflector TM2 is coplanar with the incident light of the first plane reflector TM1.

6. The method for adjusting equal optical path length of large-aperture optical elements based on angle multiplexing according to any one of claims 1 to 4, characterized in that: The plane formed by the incident and reflected light of the second plane reflector TM2 is coplanar with the reflected light of the third plane reflector TM3.

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