Influences of thermal deformation of cavity mirrors induced by high energy DF laser to beam quality under the simulated real physical circumstances

Shaoyong Deng; Shiqiang Zhang; Minbo He; Zheng Zhang; Xiaowei Guan

doi:10.1117/12.2266699

12 May 2017 Influences of thermal deformation of cavity mirrors induced by high energy DF laser to beam quality under the simulated real physical circumstances

Shaoyong Deng, Shiqiang Zhang, Minbo He, Zheng Zhang, Xiaowei Guan

Author Affiliations +

Proceedings Volume 10173, Fourth International Symposium on Laser Interaction with Matter; 101731R (2017) https://doi.org/10.1117/12.2266699
Event: 4th International Symposium on Laser Interaction with Matter, 2016, Chengdu, China

Abstract

The positive-branch confocal unstable resonator with inhomogeneous gain medium was studied for the normal used high energy DF laser system. The fast changing process of the resonator’s eigenmodes was coupled with the slow changing process of the thermal deformation of cavity mirrors. Influences of the thermal deformation of cavity mirrors to the outcoupled beam quality and transmission loss of high frequency components of high energy laser were computed. The simulations are done through programs compiled by MATLAB and GLAD software and the method of combination of finite elements and Fox-li iteration algorithm was used. Effects of thermal distortion, misaligned of cavity mirrors and inhomogeneous distribution of gain medium were introduced to simulate the real physical circumstances of laser cavity. The wavefront distribution and beam quality (including RMS of wavefront, power in the bucket, Strehl ratio, diffraction limit β, position of the beam spot center, spot size and intensity distribution in far-field ) of the distorted outcoupled beam were studied. The conclusions of the simulation agree with the experimental results. This work would supply references of wavefront correction range to the adaptive optics system of interior alleyway.

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Shaoyong Deng, Shiqiang Zhang, Minbo He, Zheng Zhang, and Xiaowei Guan "Influences of thermal deformation of cavity mirrors induced by high energy DF laser to beam quality under the simulated real physical circumstances", Proc. SPIE 10173, Fourth International Symposium on Laser Interaction with Matter, 101731R (12 May 2017); https://doi.org/10.1117/12.2266699

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KEYWORDS

Mirrors

Deuterium fluoride lasers

Optical simulations

Wavefronts

Resonators

Thermal effects

Computer simulations

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