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Liquid/air cooling sheet laser, gain module and wavefront distortion self-compensation method

A thin-film laser, gain module technology, applied in the field of lasers, can solve the problems of poor laser output beam quality, large wavefront distortion value, difficult application, etc., to improve beam quality, reduce wavefront distortion, and implement reliable effects.

Inactive Publication Date: 2020-06-05
INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The system produces wavefront distortion different from traditional solid-state lasers, and the value of wavefront distortion is large
At present, wavefront distortion has become a key problem restricting the further development of direct liquid / air-cooled thin-sheet lasers, resulting in poor output beam quality of lasers, making it difficult for practical applications

Method used

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  • Liquid/air cooling sheet laser, gain module and wavefront distortion self-compensation method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] This embodiment discloses a self-compensation method for wavefront distortion of a gain module of a liquid / air-cooled sheet laser.

[0033] Direct liquid / air-cooled thin-film lasers usually immerse the thin solid gain medium directly in the cooling medium. The matrix materials of commonly used sheet solid gain media mainly include the following categories: 1. Glass; 2. Oxide, such as sapphire, garnet, alumina and sulfur oxide; 3. Phosphate and silicate; 4. Tungstic acid Salt, molybdate, vanadate and beryllium; 5. Fluoride; 6. Ceramic materials. Among these materials, some materials have a positive thermo-optic coefficient, such as yttrium aluminum garnet (YAG); some materials have a negative thermo-optic coefficient, such as yttrium lithium fluoride (YLF). The cooling media commonly used in direct liquid-cooled thin-film lasers mainly include deionized water, heavy water, carbon tetrachloride, tetrachloroethylene, siloxane, aromatic compounds, halogenated hydrocarbons,...

Embodiment 2

[0039] See attached figure 1 , this embodiment discloses a gain module of a liquid / air-cooled sheet laser, which includes a cooling medium 8 and a gain medium 7, the gain medium is formed with a flow channel 6, the cooling medium 8 directly flows into the flow channel 6, and after flowing through the flow channel 6, the gain medium 7 is cooled, and the cooling medium 8 is a liquid cooling medium and / or a gas cooling medium; the thermo-optic coefficient of the cooling medium 8 is opposite in polarity to that of the gain medium 7.

[0040] In front and / or behind the gain medium 7, a flow field homogenization device 3 is arranged to homogenize the cooling flow field entering the gain module. Further, at the inlet of the cooling medium, a cooling flow field rectification device 2 is also provided to rectify the cooling flow field and improve the uniformity of the flow field.

Embodiment 3

[0042] Such as figure 1 As shown, this embodiment discloses a gain module of a liquid / air-cooled sheet laser, which includes a cooling flow field rectification device 2, a flow field homogenization device 3, a gain module outer frame 4, and a gain medium pre-extension section 5, The laser gain medium 7, and the gain medium is equipped with an extension section 9. The gain medium is formed with flow channels 6 . The cooling medium 8 directly enters the gain module through the inlet 1 of the gain module outer frame 4, passes through the flow field rectifying device 2 and the flow field homogenizing device 3 for homogenization, flows into the flow channel 6, flows out from the cooling medium outlet 10, and flows through the flow In the process of track 6, the gain medium 7 is cooled, and the cooling medium 8 is a liquid cooling medium and / or a gas cooling medium; the thermo-optic coefficients of the gain medium 7 and the cooling medium 8 are opposite in polarity. The flow field...

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Abstract

The invention discloses a liquid / air cooling sheet laser, a gain module and a wavefront distortion self-compensation method. The gain module directly cools a gain medium by adopting a method that a cooling medium with higher uniformity directly flows through a flow channel formed between the gain medium along the width direction of the flow channel, and the cooling medium is a liquid cooling medium and / or a gas cooling medium; the thermo-optical coefficient of the cooling medium and the thermo-optical coefficient of the gain medium are opposite in polarity. On the basis, the relations betweenthe solid thickness and the thickness of the cooling flow channel are reasonably designed. Corresponding flow field homogenizing devices are arranged in front of and behind the gain area and are usedfor improving the uniformity of a cooling flow field and reducing high-order phase difference caused by non-uniform liquid flow velocity; wavefront distortion components of crystals and liquid in thelaser gain module can be consistent and amplitudes of the crystals and the liquid are opposite under any flow velocity and heat production conditions, so that self-compensation of wavefront distortionis realized, and generation of the wavefront distortion of the gain module is reduced from the source.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a method for self-compensating gain module wavefront distortion in a direct liquid-cooled sheet laser using cooling liquid to directly cool the gain medium, and in a direct air-cooled sheet laser directly using gas to cool the gain medium. As well as the corresponding gain blocks and direct liquid / air-cooled thin-sheet lasers. Background technique [0002] High average power solid-state lasers have important application prospects in industry and defense. Traditional technical routes have encountered different technical bottlenecks in the development process of achieving high average power output. In the traditional sheet laser, the laser needs to be transmitted by multiple reflections, and the image is transmitted between the sheets through the 4f system. The volume of the system is huge, and the processing and welding of the sheet are difficult, and the aberration in the cavity introduce...

Claims

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Application Information

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IPC IPC(8): H01S3/04H01S3/042
CPCH01S3/0404H01S3/0407H01S3/042
Inventor 阮旭易家玉涂波胡浩曹海霞高清松张凯
Owner INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS
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