Study on the second harmonic generation of tunable TEA CO2 laser in quasi-phase-matched GaAs crystal

Yijun Zheng; Qiang Li; Rongqing Tan; Hao Wang

doi:10.1117/12.2202797

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15 October 2015 Study on the second harmonic generation of tunable TEA CO₂ laser in quasi-phase-matched GaAs crystal

Yijun Zheng, Qiang Li, Rongqing Tan, Hao Wang

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Proceedings Volume 9671, AOPC 2015: Advances in Laser Technology and Applications; 96711T (2015) https://doi.org/10.1117/12.2202797
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

In this paper, on the basis of the theory of quasi phase matched, CO₂ laser spectrum corresponding to GaAs chip within the scope of the matching length was calculated. Through the numerical solution of the wave equation, the relationship between power density of pump laser and frequency doubling conversion efficiency was given under the different crystal length conditions. By adjusting the CO₂ laser gas mixture components, we optimized the pump laser pulse wave to meet the requirements in the temporal distribution of the pump light. On the other hand, we optimize the output beam mode to meet the pump light distribution in space requirements. We use the tunable TEA CO₂ laser as the light source to pump quasi phase matching GaAs crystal, When the pump wavelength is changed from 9.23μm to 10.75μm range, the conversion efficiency of frequency doubling output is greater than 4%, when the pump wavelength is 10.68um, the frequency doubling efficiency reached 6.58%.

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Yijun Zheng, Qiang Li, Rongqing Tan, and Hao Wang "Study on the second harmonic generation of tunable TEA CO₂ laser in quasi-phase-matched GaAs crystal", Proc. SPIE 9671, AOPC 2015: Advances in Laser Technology and Applications, 96711T (15 October 2015); https://doi.org/10.1117/12.2202797

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