A research of weak absorption measurements in crystal based on photothermal interferometry

Bing Chen; Zongkai Liu; Shiwu Wang

doi:10.1117/12.2019741

9 July 2013 A research of weak absorption measurements in crystal based on photothermal interferometry

Bing Chen, Zongkai Liu, Shiwu Wang

Proceedings Volume 8786, Pacific Rim Laser Damage 2013: Optical Materials for High Power Lasers; 87861R (2013) https://doi.org/10.1117/12.2019741
Event: SPIE/SIOM Pacific Rim Laser Damage: Optical Materials for High-Power Lasers, 2013, Shanghai, China

Abstract

It is important for testing the process of crystal growing and crystal quality. This paper built a mathematical model based on principle of photothermal common-path interferometry, the index change induced in the crystal by the heating pump beam and the phase distortion of probe beam in the heated area are presented，then obtain the intensity distribution of the interference in the near filed. Optical geometry of focusing pump beam and intersecting pump and probe beams at waist position of the pump beam is used. This optical instruction can be adjusted easily and stabilized. Now CRYSTECH have the largest NLO crystals product line in the world, especially KTP crystals. With absorption measurements in nonlinear laser crystal KTP as an example to investigate the experimental parameters affecting the photothermal interference signal and high measuring precision. The analysis of experimental data showed this kind of instruction can reach the measurement accuracy of 0.1ppm.

Citation Download Citation

Bing Chen, Zongkai Liu, and Shiwu Wang "A research of weak absorption measurements in crystal based on photothermal interferometry", Proc. SPIE 8786, Pacific Rim Laser Damage 2013: Optical Materials for High Power Lasers, 87861R (9 July 2013); https://doi.org/10.1117/12.2019741

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