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Stray light management and control system for high-power compact terminal optical system and management and control method thereof

An optical system, control system technology, applied in optics, optical components, nonlinear optics, etc., can solve the problems of reduced optical component life, more stray light, and small distance.

Pending Publication Date: 2020-09-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Shenguang III prototype device did not absorb stray light, which caused stray light to enter the inner wall of the terminal, pollute the FOA system, and greatly reduce the life of optical components
Therefore, the stray light distribution of the compact FOA is complex, and the pollution caused by stray light has a great impact on the life of the terminal optical components and the improvement of the output capability of the laser device, which has become the focus and difficulty of current research work
[0004] Due to the small distance from the frequency doubling section to the focusing section of the compact FOA, the stray light that interacts with each other many times is complex and complex

Method used

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  • Stray light management and control system for high-power compact terminal optical system and management and control method thereof
  • Stray light management and control system for high-power compact terminal optical system and management and control method thereof
  • Stray light management and control system for high-power compact terminal optical system and management and control method thereof

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Embodiment 1

[0045] Such as figure 1As shown, this embodiment is a stray light management and control system, including terminal optical elements arranged in a compact distance along the longitudinal direction, a total of eight optical elements, concentrated in two modules: frequency conversion module and focus sampling module. The frequency conversion module is composed of an isolation window 1, a double frequency crystal 2, a triple frequency crystal 3, and a polarization smoothing crystal 4. It is close to the transmission mirror and mainly realizes the functions of atmosphere isolation, harmonic conversion and polarization smoothing, and is independently supported structurally. The focusing sampling module is composed of a focusing lens 5 , a vacuum window 6 , a primary shielding sheet 7 and a secondary shielding sheet 8 . It is close to the vacuum target chamber, and mainly realizes functions such as beam focusing, harmonic separation, measurement sampling, vacuum sealing, and debri...

Embodiment 2

[0055] This embodiment provides a design idea for a system for controlling first-order stray light. Figure 4 Design the model diagram for the first-order stray light of the focusing lens. In order to ensure that the focus of the first-order stray light of the focusing lens is located between the polarization smooth crystal and the focusing lens, the setting parameters between the components need to meet the following conditions:

[0056]

[0057] Among them: the distance between the focusing lens and the polarization smooth crystal, the fundamental frequency window and the polarization smooth crystal is d 4 , and d 5 .

[0058] The design idea of ​​first-order stray light control is as follows:

[0059] 1. Optimize the angles of the vacuum window, the primary shielding sheet and the secondary shielding sheet to ensure that the first-order stray light does not affect the optical components and frame in the focusing sampling module, and at the same time, the stray light is...

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Abstract

The invention belongs to the field of high-power laser device optical systems, discloses a stray light management and control system for a high-power compact terminal optical system and a management and control method thereof, thereby realizing the stray light management and control system and method for the high-power compact terminal optical system. The system comprises a crystal, a focusing lens, an optical flat plate element and an absorber box, and a light source sequentially passes through the crystal and the focusing lens, reaches the optical flat plate element and is reflected by the optical flat plate element. The invention provides an optimization design method for high-order stray light and first-order stray light. The optimization design of the light beam trap is provided for the high-flux first-order stray light, and the high-flux first-order stray light is bound in the light beam trap, so that the cleanliness of the system is greatly improved from the ISO5 level to the ISO3 level. The system and method are particularly suitable for stray light management and control of a high-power compact terminal optical system.

Description

technical field [0001] The invention belongs to the field of high-power laser device optical systems, and in particular relates to a stray light management and control method for realizing a high-power compact terminal optical system based on optimized terminal optical system and stray light management device parameters. Background technique [0002] The Final Optics Assembly (FOA) is the final stage of the high-power laser device, which bears the highest laser energy of the device. Wave conversion, beam focusing, vacuum isolation, debris shielding and other important functions. When the high-energy laser passes through the FOA, each surface of each transmissive optical element has residual reflected light (stray light). When the flux of stray light on the terminal optical components and structural parts is strong, it will cause hundreds of thousands of new pollution particles in the optical terminal system, reduce the life of the terminal optical components, and limit the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00G02F1/35
CPCG02B27/00G02B27/0012G02F1/353
Inventor 朱德燕李平王芳彭志涛冯斌
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS