CN112526741A - Satellite-borne dual-wavelength coaxial reflection type laser beam expander - Google Patents

Satellite-borne dual-wavelength coaxial reflection type laser beam expander Download PDF

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Publication number
CN112526741A
CN112526741A CN202011524480.3A CN202011524480A CN112526741A CN 112526741 A CN112526741 A CN 112526741A CN 202011524480 A CN202011524480 A CN 202011524480A CN 112526741 A CN112526741 A CN 112526741A
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mirror
primary mirror
laser beam
satellite
beam expander
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CN112526741B (en
Inventor
魏祥通
赵一鸣
张玉石
王钰
李飞
姜国庆
潘超
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Beijing Research Institute of Telemetry
Aerospace Long March Launch Vehicle Technology Co Ltd
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Beijing Research Institute of Telemetry
Aerospace Long March Launch Vehicle Technology Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/0977—Reflective elements
    • G02B27/0983—Reflective elements being curved
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
    • G02B7/183—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors specially adapted for very large mirrors, e.g. for astronomy, or solar concentrators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

Abstract

The invention provides a satellite-borne dual-wavelength coaxial reflection type laser beam expander, which comprises a transition plate assembly, a primary mirror chamber, a secondary mirror assembly and a light shield assembly, wherein the transition plate assembly, the primary mirror chamber, the secondary mirror assembly and the light shield assembly are sequentially arranged; the dual-reflector Cassegrain-type optical fiber laser has the advantages that the Cassegrain dual-reflector structure is adopted, the primary mirror repairing and grinding pad is used for adjusting the distance and the angle between the primary mirror and the secondary mirror, the back of the primary mirror is of a triangular lightweight structure, and the primary mirror and the secondary mirror are both made of anti-irradiation quartz glass. The invention has compact structure, no need of correcting chromatic aberration, simple assembly and adjustment, light weight, long service life in orbit and high precision, and can realize the function of expanding and compressing divergence angle of the high-energy dual-wavelength laser output by the optical cavity of the satellite-borne dual-wavelength laser.

Description

Satellite-borne dual-wavelength coaxial reflection type laser beam expander
Technical Field
The invention relates to the technical field of light beam decomposition or combination systems, in particular to a satellite-borne dual-wavelength coaxial reflection type laser beam expander.
Background
The satellite-borne laser radar can be used for carrying out large-scale, continuous and quantitative detection on atmospheric aerosol, polluted gas, surface vegetation, atmospheric wind fields, clouds and the like, and can be widely applied to the fields of meteorology, forestry and agriculture, environment, military and the like. The laser emission system is a key component of laser radar load and mainly comprises a laser and a beam expander. Because the light spot of the light beam emitted by the laser is small and the divergence angle is large, a beam expander is needed to expand and compress the divergence angle of the original laser light beam emitted by the laser.
For 532nm and 1064nm dual-wavelength laser beams, the traditional transmission type beam expander needs to use a plurality of lenses, chromatic aberration needs to be corrected and eliminated, the design and the installation and the adjustment are difficult, the weight is heavy, the selection of the plurality of lenses and various lens materials can cause the reduction of the radiation resistance, and the service life of the laser radar load in orbit is shortened.
The shielding ratio of the reflective beam expander is large, the requirements on structural design and adjustment precision are high, and the reflective beam expander is particularly applied to a satellite-borne platform and is more complex.
Disclosure of Invention
The invention provides a satellite-borne dual-wavelength coaxial reflection type laser beam expander, aiming at solving the use problem of a reflection type beam expander on a satellite-borne platform, and the function of expanding and compressing divergence angles of large-energy dual-wavelength laser output by an optical cavity of a satellite-borne dual-wavelength laser is realized by using a Cassegrain double-reflector structure, distance and angle adjustment of a main mirror lapping pad and a transition plate lapping pad and light weight design.
The invention provides a satellite-borne dual-wavelength coaxial reflection type laser beam expander, which comprises a transition plate assembly, a primary mirror chamber, a secondary mirror assembly and a light shield assembly, wherein the transition plate assembly, the primary mirror chamber, the secondary mirror assembly and the light shield assembly are sequentially arranged;
the primary mirror assembly comprises a primary mirror, a primary mirror flexible joint arranged on the outer side of the primary mirror, a primary mirror bottom plate used for installing the primary mirror flexible joint and a primary mirror repairing and grinding pad, and a primary mirror chamber is arranged on the outer side of the primary mirror and is installed on the transition plate assembly;
the secondary mirror assembly comprises a secondary mirror and a secondary mirror bracket for supporting the secondary mirror;
the satellite-borne dual-wavelength coaxial reflection type laser beam expander adopts a Cassegrain double-reflector structure, and the primary mirror repairing and grinding pad is used for adjusting the distance and the angle between the primary mirror and the secondary mirror.
According to the satellite-borne dual-wavelength coaxial reflection type laser beam expander, as an optimal mode, the primary mirror and the secondary mirror are both parabolic reflectors, and the number of the primary mirror flexible joints and the number of the primary mirror repairing and grinding pads are 3.
The invention relates to a satellite-borne dual-wavelength coaxial reflection type laser beam expander, which is characterized in that as an optimal mode, a transition plate assembly comprises a transition plate and a transition plate repairing and grinding pad arranged around the transition plate and used for adjusting the angle between the laser beam expander and a laser, wherein the transition plate is used for installing the laser beam expander on the laser.
As an optimal mode, the primary mirror and the secondary mirror are made of anti-irradiation quartz glass.
As an optimal mode, the primary mirror and the secondary mirror are both plated with 532nm and 1064nm double-wavelength high-reflectivity high-damage-threshold-value polarization-maintaining films, and the laser beam expander is used for expanding 532nm and 1064nm double-wavelength lasers.
The invention relates to a satellite-borne dual-wavelength coaxial reflection type laser beam expander, which is used as an optimal mode, wherein the back of a main mirror is of a triangular lightweight structure; the primary mirror flexible joint supports the primary mirror using three-point flexible side.
The invention relates to a satellite-borne dual-wavelength coaxial reflection type laser beam expander, wherein a secondary mirror support is of a three-fork structure as an optimal mode.
The invention relates to a satellite-borne dual-wavelength coaxial reflection type laser beam expander, which is characterized in that a secondary mirror support is integrally cast by titanium alloy materials as a preferred mode.
The invention relates to a satellite-borne dual-wavelength coaxial reflection type laser beam expander, which is used as an optimal mode, wherein a transition plate, a main mirror bottom plate and a main mirror chamber are all made of aluminum-based silicon carbide materials; the transition plate repairing and grinding pad, the main mirror flexible joint and the main mirror repairing and grinding pad are made of titanium alloy.
The invention relates to a satellite-borne dual-wavelength coaxial reflection type laser beam expander, which is used as an optimal mode, wherein a light shield component is used for shielding stray light and preventing the stray light from reversely converging, so that a laser is protected.
The cassegrain system is also called cassegrain telescopic optical system, and is a reflective telescopic system with one of the secondary mirror focal points coinciding with the primary mirror focal point.
The main mirror adopts a back triangular lightweight design, and the dead weight of the main mirror is maximally reduced on the premise of ensuring the self rigidity of the mirror body; the main mirror support adopts a three-point flexible side support design, so that the adverse effect of thermal stress on the mirror surface shape is reduced to the maximum extent;
the secondary mirror bracket is of a three-fork structure and is integrally cast by titanium alloy materials, so that the structural weight can be effectively reduced, and the assembly stress is avoided;
the main mirror chamber, the main mirror bottom plate and the transition plate are made of aluminum-based silicon carbide materials, the structural weight is maximally reduced on the premise of meeting the structural rigidity and stability, and the self weight of the beam expanding mirror which is light enough is vital to the laser because the beam expanding mirror needs to be installed on the laser; the primary mirror flexible joint, the primary mirror repairing and grinding pad and the transition plate repairing and grinding pad are made of titanium alloy materials, so that the grinding is convenient to assemble and debug in the process, and the structural stability of the beam expanding mirror after the assembling and debugging is guaranteed.
The satellite-borne dual-wavelength coaxial reflection type laser beam expander can be stably used for 532nm and 1064nm dual-wavelength laser beam expansion with single pulse energy respectively larger than 110mJ in a space environment; the Cassegrain double-reflector design is adopted, the chromatic aberration is not required to be corrected, the design and the adjustment are simple, and the weight is light; the double reflectors are made of mature anti-radiation quartz glass, so that the service life of the double reflectors is long; the beam expanding magnification is more than 15 times, and the optical efficiency of expanding beams of the laser with double wavelengths of 532nm and 1064nm is more than 93 percent;
back off bias ratio
Figure BDA0002850093790000031
The invention has the following advantages:
(1) the structure is compact: the Cassegrain double-reflector design is adopted, and chromatic aberration does not need to be corrected; the angle distance between each component can be adjusted, so that the assembly and the adjustment are simple; through the structural design, the weight of the product is reduced, and the whole machine is suitable for satellite-borne use; mature radiation-resistant quartz glass is adopted, and the service life of the on-orbit is prolonged.
(2) The precision is high: the invention has the advantages that the beam expansion multiplying power is more than 15 times, the beam expansion optical efficiency of the laser with double wavelengths of 532nm and 1064nm is more than 93 percent, and the depolarization ratio can reach less than or equal to 1 percent.
Drawings
FIG. 1 is a perspective view of a satellite-borne dual-wavelength coaxial reflective laser beam expander structure;
FIG. 2 is a three-dimensional exploded view of a satellite-borne dual-wavelength coaxial reflective laser beam expander structure;
FIG. 3 is an optical design of a satellite-borne dual-wavelength coaxial reflective laser beam expander;
FIG. 4 is an exploded view of a satellite-borne dual-wavelength coaxial reflective laser beam expander primary mirror assembly;
FIG. 5 is a diagram of a satellite-borne dual-wavelength coaxial reflective secondary laser beam expander mirror assembly;
fig. 6 is a structure diagram of a satellite-borne dual-wavelength coaxial reflection type laser beam expander transition plate assembly.
Reference numerals:
1. a transition plate assembly; 11. a transition plate; 12. a transition plate lapping pad; 2. a primary mirror assembly; 21. a primary mirror; 22. a primary mirror flexible joint; 23. a primary mirror base plate; 24. a primary mirror lapping pad; 3. a main mirror chamber; 4. a secondary mirror assembly; 41. a secondary mirror; 42. a secondary mirror support; 5. a light shield assembly.
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.
Example 1
As shown in fig. 1, a satellite-borne dual-wavelength coaxial reflection type laser beam expander comprises a transition plate assembly 1, a primary mirror assembly 2, a primary mirror chamber 3, a secondary mirror assembly 4 and a light shield assembly 5 arranged outside the secondary mirror assembly 4, which are sequentially arranged;
as shown in fig. 4, the main mirror assembly 2 includes a main mirror 21 and a main mirror flexible joint 22 disposed outside the main mirror 21, a main mirror base plate 23 for mounting the main mirror flexible joint 22, and a main mirror lapping pad 24, and the main mirror chamber 3 is disposed outside the main mirror 21 and mounted on the transition plate assembly 1;
as shown in fig. 5, the secondary mirror assembly 4 includes a secondary mirror 41 and a secondary mirror holder 42 for holding the secondary mirror 41;
the satellite-borne dual-wavelength coaxial reflection type laser beam expander adopts a Cassegrain double-reflector structure, and the primary mirror repairing and grinding pad 24 is used for adjusting the distance and the angle between the primary mirror 21 and the secondary mirror 41.
Example 2
As shown in fig. 1-3, a satellite-borne dual-wavelength coaxial reflection type laser beam expander comprises a transition plate assembly 1, a primary mirror assembly 2, a primary mirror chamber 3, a secondary mirror assembly 4 and a light shield assembly 5 arranged outside the secondary mirror assembly 4, which are sequentially arranged;
as shown in fig. 6, the transition plate assembly 1 includes a transition plate 11 and a transition plate lapping pad 12 disposed around the transition plate 11 for adjusting an angle between the laser beam expander and the laser, the transition plate 11 being used for mounting the laser beam expander on the laser;
as shown in fig. 4, the main mirror assembly 2 includes a main mirror 21, a main mirror flexible joint 22 disposed outside the main mirror 21, a main mirror base plate 23 for mounting the main mirror flexible joint 22, and a main mirror lapping pad 24, and the main mirror chamber 3 is disposed outside the main mirror 21 and mounted on the transition plate assembly 1;
the back of the main mirror 21 is of a triangular lightweight structure; the number of the primary mirror flexible joints 22 and the number of the primary mirror repairing pads 24 are both 3; the primary mirror flexible joint 22 supports the primary mirror 21 using three-point flexible side;
as shown in fig. 5, the secondary mirror assembly 4 includes a secondary mirror 41 and a secondary mirror holder 42 for holding the secondary mirror 41;
the satellite-borne dual-wavelength coaxial reflection type laser beam expander adopts a Cassegrain double-reflector structure, and the primary mirror repairing and grinding pad 24 is used for adjusting the distance and the angle between the primary mirror 21 and the secondary mirror 41;
the secondary mirror bracket 42 is of a three-fork structure;
the light shield assembly 5 is used for shielding stray light and preventing the stray light from reversely gathering.
Example 3
As shown in fig. 1-3, a satellite-borne dual-wavelength coaxial reflection type laser beam expander comprises a transition plate assembly 1, a primary mirror assembly 2, a primary mirror chamber 3, a secondary mirror assembly 4 and a light shield assembly 5 arranged outside the secondary mirror assembly 4, which are sequentially arranged;
as shown in fig. 6, the transition plate assembly 1 includes a transition plate 11 and a transition plate lapping pad 12 disposed around the transition plate 11 for adjusting an angle between the laser beam expander and the laser, the transition plate 11 being used for mounting the laser beam expander on the laser;
as shown in fig. 4, the main mirror assembly 2 includes a main mirror 21, a main mirror flexible joint 22 disposed outside the main mirror 21, a main mirror base plate 23 for mounting the main mirror flexible joint 22, and a main mirror lapping pad 24, and the main mirror chamber 3 is disposed outside the main mirror 21 and mounted on the transition plate assembly 1;
the back of the main mirror 21 is of a triangular lightweight structure; the primary mirror flexible joint 22 supports the primary mirror 21 using three-point flexible side; the number of the primary mirror flexible joints 22 and the number of the primary mirror repairing pads 24 are both 3;
as shown in fig. 5, the secondary mirror assembly 4 includes a secondary mirror 41 and a secondary mirror holder 42 for holding the secondary mirror 41;
the satellite-borne dual-wavelength coaxial reflection type laser beam expander adopts a Cassegrain double-reflector structure, and the primary mirror repairing and grinding pad 24 is used for adjusting the distance and the angle between the primary mirror 21 and the secondary mirror 41;
the primary mirror 21 and the secondary mirror 41 are both parabolic mirrors;
the primary mirror 21 and the secondary mirror 41 are made of radiation-resistant quartz glass;
the primary mirror 21 and the secondary mirror 41 are both plated with 532nm and 1064nm double-wavelength high-reflectivity, high-damage threshold and polarization-maintaining films, and the laser beam expander is used for expanding beams of 532nm and 1064nm double-wavelength lasers;
the transition plate 11, the main mirror bottom plate 21 and the main mirror chamber 3 are all made of aluminum-based silicon carbide materials; the transition plate lapping pad 12, the primary mirror flexible joint 22 and the primary mirror lapping pad 24 are made of titanium alloy;
the secondary mirror bracket 42 is of a three-fork structure;
the secondary mirror bracket 42 is formed by integrally casting a titanium alloy material;
the light shield assembly 5 is used for shielding stray light and preventing the stray light from reversely gathering.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (10)

1. The utility model provides a coaxial reflective laser beam expander of satellite-borne dual wavelength which characterized in that: the mirror assembly comprises a transition plate assembly (1), a primary mirror assembly (2), a primary mirror chamber (3), a secondary mirror assembly (4) and a light shield assembly (5) arranged outside the secondary mirror assembly (4) which are arranged in sequence;
the primary mirror assembly (2) comprises a primary mirror (21), a primary mirror flexible joint (22) arranged on the outer side of the primary mirror (21), a primary mirror bottom plate (23) used for installing the primary mirror flexible joint (22) and a primary mirror repairing and grinding pad (24), and the primary mirror chamber (3) is arranged on the outer side of the primary mirror (21) and is installed on the transition plate assembly (1);
the secondary mirror assembly (4) comprises a secondary mirror (41) and a secondary mirror bracket (42) for supporting the secondary mirror (41);
the satellite-borne dual-wavelength coaxial reflection type laser beam expander adopts a Cassegrain double-reflection mirror structure, and the primary mirror repairing and grinding pad (24) is used for adjusting the distance and the angle between the primary mirror (21) and the secondary mirror (41).
2. The satellite-borne dual-wavelength coaxial reflection laser beam expander according to claim 1, wherein: the primary mirror (21) and the secondary mirror (41) are both parabolic mirrors; the number of the main mirror flexible joints (22) and the number of the main mirror lapping pads (24) are both 3.
3. The satellite-borne dual-wavelength coaxial reflection laser beam expander according to claim 1, wherein: the transition plate component (1) comprises a transition plate (11) and a transition plate repairing and grinding pad (12) which is arranged around the transition plate (11) and used for adjusting the angle between the laser beam expanding lens and the laser, wherein the transition plate (11) is used for mounting the laser beam expanding lens on the laser.
4. The satellite-borne dual-wavelength coaxial reflection laser beam expander according to claim 1, wherein: the primary mirror (21) and the secondary mirror (41) are made of radiation-resistant quartz glass.
5. The satellite-borne dual-wavelength coaxial reflection laser beam expander according to claim 1, wherein: the primary mirror (21) and the secondary mirror (41) are both plated with 532nm and 1064nm dual-wavelength high-reflectivity high-damage-threshold and polarization-maintaining films, and the laser beam expander is used for expanding beam of 532nm and 1064nm dual-wavelength laser.
6. The satellite-borne dual-wavelength coaxial reflection laser beam expander according to claim 2, wherein: the back of the main mirror (21) is of a triangular lightweight structure; the primary mirror flexible joint (22) supports the primary mirror (21) using three-point flexible sides.
7. The satellite-borne dual-wavelength coaxial reflection laser beam expander according to claim 1, wherein: the secondary mirror bracket (42) is of a three-fork structure.
8. The satellite-borne dual-wavelength coaxial reflection laser beam expander according to claim 1, wherein: the secondary mirror bracket (42) is formed by integrally casting a titanium alloy material.
9. The satellite-borne dual-wavelength coaxial reflection laser beam expander according to claim 3, wherein: the transition plate (11), the primary mirror bottom plate (23) and the primary mirror chamber (3) are all made of aluminum-based silicon carbide materials; the transition plate lapping pad (12), the primary mirror flexible joint (22) and the primary mirror lapping pad (24) are made of titanium alloy.
10. The satellite-borne dual-wavelength coaxial reflection laser beam expander according to claim 1, wherein: the light shield assembly (5) is used for shielding stray light and preventing the stray light from reversely gathering.
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