CN109541801B - Stray light pipe control system and method for high-power terminal optical system - Google Patents
Stray light pipe control system and method for high-power terminal optical system Download PDFInfo
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- CN109541801B CN109541801B CN201811486696.8A CN201811486696A CN109541801B CN 109541801 B CN109541801 B CN 109541801B CN 201811486696 A CN201811486696 A CN 201811486696A CN 109541801 B CN109541801 B CN 109541801B
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Abstract
The invention discloses a stray light tube control system and method for realizing a high-power terminal optical system based on optimized terminal optical system and stray light management device parameters, and belongs to the field of high-power laser device optical systems. The system comprises a crystal, a wedge-shaped lens, an optical flat element and an absorber box, wherein a light source sequentially passes through the crystal and the wedge-shaped lens, then reaches the optical flat element and is reflected by the optical flat element. The technical scheme provided by the invention does not damage the wedge-shaped lens and does not pollute the terminal optical system; the aperture of the light beam of the stray light converged by the wedge-shaped lens and deviating from the main light path is ensured to be increased, the flux of the stray light is reduced, and the difficulty in stray light management is reduced; the designed optical trap ensures that stray light cannot leak out of the absorber box, controls low-flux stray light which is not converged by the wedge-shaped lens and high-flux stray light which is converged by the wedge-shaped lens, has simple and easy scheme and ingenious design, and is particularly suitable for stray light control of a high-power terminal optical system.
Description
Technical Field
The invention belongs to the field of optical systems of high-power laser devices, and particularly relates to a stray light tube control system and a stray light tube control method for realizing a high-power terminal optical system based on optimized terminal optical systems and stray light management device parameters.
Background
A terminal optical system (FOA) is a core subsystem of a high power laser device, and is composed of a plurality of transmissive optical elements, including: the crystal, the wedge lens, the vacuum window and the shielding sheet play important functions of harmonic conversion, harmonic separation, measurement sampling, light beam focusing and the like. When high-power laser passes through a transmission type optical element on the FOA, each surface of the element has residual reflection, and if the flux of the residual reflection light on the terminal optical element, an element frame or a metal cylinder wall is too strong, the optical element is damaged, and a terminal system is polluted. Therefore, it is an important issue of the high power laser device FOA to avoid the damage of the stray light to the optical element and to reasonably manage the stray light.
The National Ignition Facility (NIF) FOA comprises 192 paths, can generate laser output of 1.8MJ (3.5ns, 500TW power) 351nm, has 1344 optical elements in total, and has complex stray light distribution. Since 1994 NIF completed its conceptual design, after integration verification, finalization was finally completed in 2007, but until 2017, 5 months, it was still reported that the terminal contamination and the optical element damage due to stray light were found. The design of the domestic deity series device FOA also goes through the process of integrated verification and design change. In 2008, the god light II upgrading device carries out optimization design on FOA aiming at the damage of ghost image to the optical element.
At present, the stray light management and control of a high-power terminal optical system mostly adopts a method of optimizing the angle and the distance of a rear element of a wedge-shaped lens, so that the first-order stray light reflected by the stray light deviates from a main light path, and adding an absorbing glass and other devices at the position deviating from the main light path for absorbing and managing the stray light (Qiao Zhan Feng, Luxingqiang, Zhao Dong, Zhubao Qiang, arrangement design of terminal optical components of a Shenguang II upgrading device, Chinese laser, 2008, 9(35): 1328-1332). However, in the high-power terminal optical system, since the high-power stray light is focused by the wedge-shaped lens, the stray light flux at the position deviated from the main light path is too high, the absorption glass is damaged by the high-flux stray light, and the terminal optical system is polluted. Meanwhile, part of stray light can strike the wedge-shaped lens frame to irradiate the terminal structural part, so that pollution is generated. Therefore, the conventional stray light control method is ineffective, so that the application range of the stray light control method in the prior art is limited.
Disclosure of Invention
The invention aims to: in order to overcome the defect that the conventional stray light control method cannot be used for a high-power terminal optical system, the invention provides a stray light control system and method for the high-power terminal optical system.
The technical scheme adopted by the invention is as follows:
a stray light control system for a high-power terminal optical system comprises a crystal (5), a wedge-shaped lens (2), an optical flat element and an absorber box (1) which are sequentially arranged along the direction of a light path, wherein a light source reaches the optical flat element after sequentially passing through the crystal (5) and the wedge-shaped lens (2) and is reflected by the optical flat element, part of reflected light rays are not converged by the wedge-shaped lens (2) to form low-flux stray light and directly reach the absorber box (1), and part of reflected light rays are converged by the wedge-shaped lens (2) to form high-flux stray light and reach the absorber box (1); the high-flux stray light and the low-flux stray light are incident into the absorber box (1) and are absorbed by the absorber box (1).
Furthermore, the optical flat element at least comprises a vacuum window (3) and a shielding sheet (4), the vacuum window (3) and the shielding sheet (4) are placed in parallel according to an inclined angle behind the wedge-shaped lens (2), and the vacuum window (3), the shielding sheet (4) and the wedge-shaped lens (2) are separated by a certain distance.
Further, the absorber box (1) simultaneously absorbs the stray light which is not converged by the wedge-shaped lens (2) and the stray light converged by the wedge-shaped lens (2) by using the same absorber box; the absorber box (1) comprises a box body (11), quartz glass (12), first absorption glass (13) and second absorption glass (14), wherein the quartz glass (12) and the first absorption glass (13) are placed in the box body (11), the quartz glass (12) and the first absorption glass (13) are stacked in parallel in the box body and form a closed space in the box body, a certain distance is reserved between the stacked quartz glass (12) and the first absorption glass (13), and a certain angle is formed between the quartz glass (12) and the first absorption glass (13) and the vertical plane in the box body; a second absorption glass (14) is arranged above the box body (11), and one surface of the box body (11) is an unsealed opening for allowing stray light to be absorbed to enter the absorption body box (1) from the opening.
Furthermore, the wedge-shaped lens (2) is an improved wedge-shaped lens and comprises a wedge-shaped lens body (21), a lens hollow-out part (22) and a lens clamp (23), wherein the lens hollow-out part (22) is obtained by performing hollow-out processing on the thin edge of the wedge-shaped lens body (21), and the lens clamp (23) adopts a mode of performing three-edge clamping on the wedge-shaped lens body (21) so that stray light does not hit a structural member of the wedge-shaped lens (2) after leaking.
Furthermore, by the mutually associated cooperation of the absorber box (1) consisting of the quartz glass (12) and the first absorption glass (13) and the second absorption glass (14) with the modified wedge lens (2) and the vacuum window (3), stray light is prevented from leaking out of the absorber box (1) by repeatedly reflecting and absorbing the absorption glass under high-flux irradiation:
after reaching the absorber box (1), the high-flux stray light is divided into two parts by quartz glass (12), and most of the high-flux stray light is transmitted by the quartz glass (12) and then absorbed by first absorption glass (13) which is positioned behind the quartz glass (12) and has the same angle with the quartz glass (12); the first absorption glass (13) reflects the incompletely absorbed stray light, transmits the stray light by the quartz glass (12), and then is absorbed by the second absorption glass (14); the remaining small part of the high flux stray light is reflected by the quartz glass (12) and then is absorbed by a second absorption glass (14) positioned above the quartz glass (12); if the second absorption glass (14) does not completely absorb the stray light and reflects the unabsorbed stray light out, the unabsorbed stray light is transmitted again by the quartz glass (12) and then absorbed by the first absorption glass (13);
the low-flux stray light is directly absorbed by the second absorption glass (14), if the second absorption glass (14) does not completely absorb the stray light, the unabsorbed stray light is reflected out, is transmitted by the quartz glass (12), and is absorbed by the first absorption glass (13).
In another aspect, the present invention provides a stray light control method for a high power optical terminal system, the method comprising the steps of:
s1, constructing a stray light control system of the terminal optical system, sequentially placing a crystal (5), a wedge-shaped lens (2), an optical flat element and an absorber box (1) along the light path direction, enabling a light source to sequentially pass through the crystal (5) and the wedge-shaped lens (2), then reach the optical flat element and be reflected by the optical flat element, and enabling stray light reflected by the optical flat element to enter the absorber box (1);
s2, calculating corresponding setting parameters in the stray light control system based on the inclination angle of the optical flat element and the optimization model of the distance between the optical flat element and the wedge-shaped lens (2);
s3, setting parameters of each component in the stray light control system are adjusted, so that part of reflected light rays are not converged by the wedge-shaped lens (2) to form low-flux stray light and directly enter the absorber box (1), part of reflected light rays are converged by the wedge-shaped lens (2) to form high-flux stray light and enter the absorber box (1), and the high-flux stray light and the low-flux stray light enter the absorber box (1) and are absorbed by the absorber box (1).
Further, the optimization model in step S2 is specifically:
the amount of the first-order stray light (31) traversing the wedge lens is:
wherein theta represents the inclination angle of the optical flat element, D represents the distance between the optical flat element behind the wedge-shaped lens (2) and the wedge-shaped lens (2), f represents the focal length of the wedge-shaped lens (2), and D represents the clear aperture of the terminal optical system;
the aperture of the first-order stray light transversely moving out of the light passing area, namely the aperture of the stray light beam at the position of the absorber box (1), is as follows:
as can be seen from equation (1): in order to reduce the amount of first-order stray light traversing the wedge lens (2), the inclination angle theta of the optical element needs to be reduced, and the element pitch d needs to be reduced.
Furthermore, the optical flat plate element at least comprises a vacuum window (3) and a shielding sheet (4), the vacuum window (3) and the shielding sheet (4) are placed in parallel behind the wedge-shaped lens (2) according to an inclination angle theta, a certain distance d is reserved between the vacuum window (3) and the wedge-shaped lens (2) and between the shielding sheet (4) and the wedge-shaped lens (2), and a proper inclination angle theta and a proper element distance d are selected when parameters are set, so that the stray light flux is acceptable, meanwhile, the transverse displacement is relatively small, and the stray light control system structure can be realized.
Further, the method also comprises adjusting the related setting parameters of the absorber box (1), including:
the quartz glass (12) and the first absorption glass (13) are parallelly stacked in the box body of the absorber box (1) and form a closed space in the box body, a certain distance is reserved between the stacked quartz glass (12) and the first absorption glass (13), the quartz glass (12) and the first absorption glass (13) form a certain angle with the vertical surface in the box body, and the distance between the quartz glass (12) and the first absorption glass (13) and the angle between the quartz glass (12) and the first absorption glass (13) and the vertical surface are adjusted.
Furthermore, the setting parameters of the absorber box (1) are adjusted to ensure that stray light cannot leak out of the absorber box (1) through the mutual correlation and matching of the absorber box (1) consisting of the quartz glass (12), the first absorbing glass (13) and the second absorbing glass (14), the improved wedge-shaped lens (2) and the vacuum window (3) and the absorption glass under high-flux irradiation through repeated reflection and absorption sealing.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the stray light control system and the stray light control method for the high-power terminal optical system, provided by the invention, improve the wedge-shaped lens, ensure that stray light leaks through the wedge-shaped lens in a way of leaking thin edges and clamping three edges, the stray light does not hit a structural member of the wedge-shaped lens, the wedge-shaped lens is not damaged, and the terminal optical system is not polluted.
2. The stray light control system and the method for the high-power terminal optical system can increase and adjust the inclination angles of the vacuum window and the shielding sheet of the optical flat element, ensure that the stray light converged by the wedge-shaped lens deviates from the increase of the aperture of a light beam of a main light path, reduce the flux of the stray light and reduce the management difficulty of the stray light.
3. The stray light control system and the method for the high-power terminal optical system provided by the invention utilize the same absorption box to absorb stray light which is not converged by the wedge-shaped lens and stray light which is converged by the wedge-shaped lens, the absorption box adopts a mode of quartz glass and absorption glass, and the absorption glass under high-flux irradiation is ensured to be sealed through repeated reflection and absorption, so that the absorption glass damage caused by the high-flux stray light can not pollute the terminal optical system; the angle and the distance between the quartz glass and the absorption glass in the absorber box are optimized, and an optical trap is designed to ensure that stray light cannot leak out of the absorber box.
4. According to the stray light control system and method for the high-power terminal optical system, the wedge-shaped lens is designed into the absorber box in a mode that the thin edges of the wedge-shaped lens are hollowed out and clamped at three edges, and the quartz glass and the absorbing glass are combined, so that low-flux stray light which is not converged by the wedge-shaped lens and high-flux stray light which is converged by the wedge-shaped lens are controlled.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a stray light control system according to an embodiment of the present invention.
Fig. 2 is a schematic view of a wedge-shaped lens blank-leaking design structure provided by the embodiment of the invention.
FIG. 3 is a diagram of an optimization model of element spacing and angle provided by an embodiment of the present invention.
Fig. 4 is a diagram illustrating the relationship between the aperture of the stray light beam and the tilt angle and the pitch of the device according to the embodiment of the present invention.
In the figure: 1-absorber box, 2-wedge lens, 3-vacuum window, 4-shielding sheet, 5-crystal, 11-box body, 12-quartz glass, 13-first absorption glass, 14-second absorption glass, 21-wedge lens body, 22-lens hollow part, 23-lens clamp, 31-first-order stray light and T-focal plane.
Detailed Description
In order to make the technical solutions of the present invention better understood, the following description of the technical solutions of the present invention with reference to the accompanying drawings of the present invention is made clearly and completely, and other similar embodiments obtained by a person of ordinary skill in the art without any creative effort based on the embodiments in the present application shall fall within the protection scope of the present application.
Example 1
As shown in fig. 1, this embodiment is a stray light absorber box (1) that absorbs, with the same absorber box, stray light that has not been converged by a wedge lens and stray light that has been converged by a wedge lens; the absorber box comprises a box body (11), quartz glass (12), first absorption glass (13) and second absorption glass (14), wherein the quartz glass (12) and the first absorption glass (13) are placed in the box body (11), the quartz glass (12) and the first absorption glass (13) are stacked in parallel in the box body and form a closed space in the box body, a certain distance is reserved between the stacked quartz glass (12) and the first absorption glass (13), and a certain angle is formed between the quartz glass (12) and the first absorption glass (13) and the vertical plane in the box body; a second absorption glass (14) is arranged above the box body (11), and one surface of the box body (11) is an unsealed opening for allowing stray light to be absorbed to enter the absorber box from the opening.
When stray light enters the absorber box, the angle and the distance between quartz glass and absorption glass in the absorber box are designed, so that the absorber box becomes an optical trap to repeatedly reflect and absorb the stray light, the stray light is prevented from leaking out of the absorber box, meanwhile, high-flux stray light is prevented from hitting the absorption glass, generated dust is sealed in the absorber box, and a terminal system is not polluted.
Example 2
As shown in fig. 2, an improved wedge lens (2) is provided, which includes a wedge lens body (21), a lens hollow-out portion (22) and a lens clamp (23), wherein the lens hollow-out portion (22) is obtained by processing the thin edge of the wedge lens body (21) in a leaking manner, and the lens clamp (23) adopts a mode of clamping three edges of the wedge lens body (21), so that stray light is prevented from hitting a structural member of the wedge lens after leaking, and a terminal optical system is prevented from being polluted.
Example 3
Since the absorption glass is damaged if the high-flux stray light converged by the wedge lens is directly absorbed by the absorption glass, and the dust generated after the damage contaminates the terminal optical system, the absorber box 1 is designed to absorb the high-flux stray light by combining the quartz glass 12 and the absorption glasses 13 to 14. To further describe in detail by taking the example of stray light reflection and absorption by the vacuum window 3 in fig. 1 as an example, light reaches the vacuum window 3 after passing through the wedge lens 2 and is reflected by the vacuum window 3, and part of the reflected light is converged by the wedge lens 2 to become high-flux stray light. After the high-flux stray light reaches the absorber box 1, the high-flux stray light is divided into two parts by the quartz glass 12, most of the high-flux stray light is transmitted by the quartz glass 12 and then is absorbed by the first absorption glass 13 which is positioned behind the quartz glass 12 and has the same angle with the quartz glass 12, at the moment, dust generated after the high-flux laser damages the first absorption glass 13 is sealed in the absorber box 1 by the quartz glass 12, and the damage threshold of the quartz glass 12 is high, so that no damage or dust is generated, and the clean state of the terminal system is ensured; the first absorbing glass 13 reflects stray light which is not completely absorbed, and then the stray light is transmitted by the quartz glass 12 and absorbed by the second absorbing glass 14, as shown by the corresponding light ray arrow direction in fig. 1. Meanwhile, the remaining small portion of the stray light condensed by the wedge lens 2 is reflected by the quartz glass 12 and then absorbed by the second absorbing glass 14 located above the quartz glass, as shown by the corresponding light ray arrow direction in fig. 1. If the second absorbing glass 14 does not completely absorb the stray light, and reflects the unabsorbed stray light out, the stray light is transmitted again by the quartz glass and then absorbed by the first absorbing glass 13, as shown by the corresponding light ray arrow direction in fig. 1.
On the other hand, low-flux stray light not condensed by the wedge lens 2 is directly absorbed by the second absorbing glass 14, as indicated by the corresponding ray arrows in fig. 1. If the second absorbing glass 14 does not completely absorb the stray light, the unabsorbed stray light is reflected out, transmitted by the quartz glass 12, and then absorbed by the first absorbing glass 13.
After the steps are repeated, the absorber box 1 formed by the quartz glass (12), the first absorbing glass 13 and the second absorbing glass 14 is matched with the improved wedge-shaped lens 2 and the vacuum window 3 in a mutual correlation manner, so that the absorbing glass under high-flux irradiation can be sealed, and the absorbing glass damage caused by high-flux stray light cannot pollute a terminal optical system; meanwhile, the angles and the distances between the quartz glass and the absorption glass in the absorber box 1 are optimized, and a corresponding optical trap is designed to ensure that stray light cannot leak out of the absorber box.
Note that, since the stray light management method of reflection by the shield sheet 4 is the same as that of the vacuum window 3 after the shield sheet is positioned in the vacuum window 3, the stray light management method of reflection by the shield sheet is not particularly shown in fig. 1.
In one embodiment, the inclination angles of the vacuum window 3 and the shielding plate 4 can be increased, so that the fact that the stray light converged by the wedge-shaped lens 2 deviates from the aperture of the light beam of the main light path is increased is ensured, the flux of the stray light is reduced, and the difficulty in stray light management is reduced.
Example 4
In the foregoing embodiments, a configuration of a stray light control system for a high-power terminal optical system is described, where components of the system need to be set according to certain parameters, so as to design a corresponding optical trap to better absorb stray light. The corresponding embodiment describes in detail a method for managing stray light by using the system, and the method includes the following steps:
step S1, first, as shown in fig. 3, an optimal design model of the inclination angle of the optical flat plate element (the vacuum window 3 and the shielding plate 4) behind the wedge lens 2 and the distance between the optical flat plate element and the wedge lens 2 is constructed, where T represents the position of the focal plane, and the amount of the first-order stray light 31 traversing the wedge lens is:
wherein θ represents the inclination angle of the vacuum window 3 or the shielding plate 4, D represents the distance between the vacuum window 3 or the shielding plate 4 and the wedge-shaped lens 2, f represents the focal length of the wedge-shaped lens 2, and D represents the clear aperture of the terminal optical system.
The aperture of the first-order stray light traversing the light-transmitting area, i.e. the aperture of the stray light beam at the absorber box 1, is:
the spacing d should not be too large during the actual picking process, since the flux of the elements themselves increases as the element spacing increases. As can be seen from equation (2): the absorbing glass size expression is too cumbersome, and when the element-to-focusing lens spacings are set to 100mm, 300mm, 500mm, 700mm, 900mm, respectively, the values of the stray light beam aperture at the absorber box 1 are obtained for different tilt angles as shown in fig. 4, where different types of curves represent different spacings. As can be seen from fig. 4: in order to increase the beam aperture at the absorber box 1 and reduce the light flux at the absorber box 1, the inclination angle of the optical element needs to be increased, the element pitch needs to be increased, and the inclination angle is sensitive and the element pitch is less sensitive. And can be known from formula (1): in order to reduce the amount of the first-order stray light traversing the wedge lens 2, it is necessary to reduce the inclination angle of the optical elements and to reduce the element pitch. Therefore, during design, the inclination angle and the element spacing are balanced and optimized, the stray light flux is acceptable, the transverse displacement is relatively small, and the structure can be realized.
In addition, the present embodiment further comprises adjusting setting parameters related to the absorber cassette (1), including:
the quartz glass (12) and the first absorption glass (13) are parallelly stacked in the box body of the absorber box (1) and form a closed space in the box body, a certain distance is reserved between the stacked quartz glass (12) and the first absorption glass (13), and the quartz glass (12) and the first absorption glass (13) form a certain angle with the vertical surface in the box body, so that the distance between the quartz glass (12) and the first absorption glass (13), the angles between the quartz glass (12) and the first absorption glass (13) and the vertical surface, the placement position of an opening of the absorber box (1) in an optical system and other relevant parameters need to be adjusted. When the stray light enters the absorber box, after the angles and the distances between the quartz glass and the absorbing glass are adjusted, the absorber box becomes an optical trap to repeatedly reflect and absorb the stray light, so that the stray light is prevented from leaking out of the absorber box, meanwhile, the high-flux stray light is prevented from hitting the absorbing glass, the generated dust is sealed in the absorber box, and a terminal system is not polluted.
Further, the relevant setting parameters of the absorber box (1) are adjusted so that stray light does not leak out of the absorber box (1) by the interrelated cooperation of the absorber box (1) consisting of the quartz glass (12) and the first (13) and second (14) absorbing glasses with the modified wedge lens (2) and vacuum window (3) sealing the absorbing glass under high flux irradiation by repeated reflection and absorption.
The stray light control scheme comprises a stray light control system and a method for controlling stray light based on the control system, the system is simple and easy to set, ingenious in design and strong in adjustability, and is particularly suitable for stray light control of a high-power terminal optical system.
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (9)
1. The stray light control system is characterized by comprising a crystal (5), a wedge-shaped lens (2), an optical flat element and an absorber box (1) which are sequentially arranged along the light path direction, wherein a light source sequentially passes through the crystal (5) and the wedge-shaped lens (2) and then reaches the optical flat element and is reflected by the optical flat element, part of reflected light rays are not converged by the wedge-shaped lens (2) to form low-flux stray light and directly reach the absorber box (1), and part of reflected light rays are converged by the wedge-shaped lens (2) to form high-flux stray light and then reach the absorber box (1); the high-flux stray light and the low-flux stray light are incident into the absorber box (1) and are absorbed by the absorber box (1);
wedge lens (2) are improved wedge lens, including wedge lens mirror body (21), lens fretwork portion (22) and lens clamp (23), and lens fretwork portion (22) are obtained through making the featheredge of wedge lens mirror body (21) leak the blank processing, lens clamp (23) adopt carry out the mode of trilateral centre gripping to wedge lens mirror body (21), make stray light leak not hit on the structure of wedge lens (2) after the time.
2. The stray light management system according to claim 1, wherein the optical flat element comprises at least a vacuum window (3) and a shielding plate (4), the vacuum window (3) and the shielding plate (4) are disposed in parallel at an inclined angle behind the wedge-shaped lens (2), and the vacuum window (3) and the shielding plate (4) are spaced from the wedge-shaped lens (2).
3. A stray light management system according to claim 1 or 2, wherein said absorber box (1) simultaneously absorbs stray light that has not passed through the wedge lens (2) and stray light that has passed through the wedge lens (2) with the same absorber box; the absorber box (1) comprises a box body (11), quartz glass (12), first absorption glass (13) and second absorption glass (14), wherein the quartz glass (12) and the first absorption glass (13) are placed in the box body (11), the quartz glass (12) and the first absorption glass (13) are stacked in parallel in the box body and form a closed space in the box body, a certain distance is reserved between the stacked quartz glass (12) and the first absorption glass (13), and a certain angle is formed between the quartz glass (12) and the first absorption glass (13) and the vertical plane in the box body; a second absorption glass (14) is arranged above the box body (11), and one surface of the box body (11) is an unsealed opening for allowing stray light to be absorbed to enter the absorption body box (1) from the opening.
4. The stray light piping system according to claim 3, wherein the absorber box (1) formed by said quartz glass (12) and said first (13) and second (14) absorbing glasses cooperates with the modified wedge lens (2) and vacuum window (3) in such a way that stray light does not leak out of the absorber box (1) by repeatedly reflecting and absorbing the absorbing glass under high flux irradiation:
after reaching the absorber box (1), the high-flux stray light is divided into two parts by quartz glass (12), and most of the high-flux stray light is transmitted by the quartz glass (12) and then absorbed by first absorption glass (13) which is positioned behind the quartz glass (12) and has the same angle with the quartz glass (12); the first absorption glass (13) reflects the incompletely absorbed stray light, transmits the stray light by the quartz glass (12), and then is absorbed by the second absorption glass (14); the remaining small part of the high flux stray light is reflected by the quartz glass (12) and then is absorbed by a second absorption glass (14) positioned above the quartz glass (12); if the second absorption glass (14) does not completely absorb the stray light and reflects the unabsorbed stray light out, the unabsorbed stray light is transmitted again by the quartz glass (12) and then absorbed by the first absorption glass (13);
the low-flux stray light is directly absorbed by the second absorption glass (14), if the second absorption glass (14) does not completely absorb the stray light, the unabsorbed stray light is reflected out, is transmitted by the quartz glass (12), and is absorbed by the first absorption glass (13).
5. A stray light management method for a high-power terminal optical system, which is implemented based on the stray light management system for the high-power terminal optical system of any one of claims 1 to 4, the method comprising the steps of:
s1, constructing a stray light control system of the terminal optical system, sequentially placing a crystal (5), a wedge-shaped lens (2), an optical flat element and an absorber box (1) along the light path direction, enabling a light source to sequentially pass through the crystal (5) and the wedge-shaped lens (2), then reach the optical flat element and be reflected by the optical flat element, and enabling stray light reflected by the optical flat element to enter the absorber box (1);
s2, calculating corresponding setting parameters in the stray light control system based on the inclination angle of the optical flat element and the optimization model of the distance between the optical flat element and the wedge-shaped lens (2);
s3, setting parameters of each component in the stray light control system are adjusted, so that part of reflected light rays are not converged by the wedge-shaped lens (2) to form low-flux stray light and directly enter the absorber box (1), part of reflected light rays are converged by the wedge-shaped lens (2) to form high-flux stray light and enter the absorber box (1), and the high-flux stray light and the low-flux stray light enter the absorber box (1) and are absorbed by the absorber box (1).
6. The stray light control method for the high power terminal optical system according to claim 5, wherein the optimization model in step S2 is specifically:
the amount of the first-order stray light (31) traversing the wedge lens is:
wherein theta represents the inclination angle of the optical flat element, D represents the distance between the optical flat element behind the wedge-shaped lens (2) and the wedge-shaped lens (2), f represents the focal length of the wedge-shaped lens (2), and D represents the clear aperture of the terminal optical system;
the aperture of the first-order stray light transversely moving out of the light passing area, namely the aperture of the stray light beam at the position of the absorber box (1), is as follows:
as can be seen from equation (1): in order to reduce the amount of first-order stray light traversing the wedge lens (2), the inclination angle theta of the optical element needs to be reduced, and the element pitch d needs to be reduced.
7. The stray light management method for the high-power terminal optical system according to claim 6, wherein the optical flat element comprises at least a vacuum window (3) and a shielding plate (4), the vacuum window (3) and the shielding plate (4) are disposed in parallel at an inclination angle θ behind the wedge-shaped lens (2), the vacuum window (3) and the shielding plate (4) are spaced from the wedge-shaped lens (2) by a distance d, and the appropriate inclination angle θ and the element distance d are selected during setting parameters to ensure acceptable stray light flux, and the amount of traverse is relatively small, so that the stray light management system structure can be implemented.
8. Stray light management method for high power end optical systems according to claim 7, further comprising adjusting the setup parameters related to the absorber box (1) including:
the quartz glass (12) and the first absorption glass (13) are parallelly stacked in the box body of the absorber box (1) to form a closed space in the box body, a certain distance is reserved between the stacked quartz glass (12) and the first absorption glass (13), the quartz glass (12) and the first absorption glass (13) form a certain angle with the vertical surface in the box body, and the distance between the quartz glass (12) and the first absorption glass (13) and the angle between the quartz glass (12) and the vertical surface as well as the angle between the first absorption glass (13) and the vertical surface are adjusted.
9. Stray light management method for high power end optical systems according to claim 8, characterized in that the setup parameters of the absorber box (1) are adjusted such that stray light does not leak out of the absorber box (1) by the reciprocal cooperation of the absorber box (1) made of quartz glass (12) and first (13) and second (14) absorbing glasses with the modified wedge lens (2), vacuum window (3), sealing the absorbing glass under high flux irradiation by repeated reflection and absorption.
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