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Zhendong Shi

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Proceedings Article | 21 December 2022 Poster + Paper

An approach for the measurement of focal lengths of a weak thermally-induced negative lens

Ruina Fang, Weijiang Wang, Jiao Yang, Zhendong Shi, Hao Xing, Yun Huang, Juhong Han, Qing Luo, He Cai, Guofei An, Meng Zhang, Xi Yang, You Wang

Proceedings Volume 12315, 123151G (2022) https://doi.org/10.1117/12.2642724

KEYWORDS: Laser beam diagnostics, Fourier transforms, Crystals, Laser crystals, Thermal effects, Optical testing, Helium neon lasers, Laser beam propagation, Gaussian beams, Wave propagation

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In this paper, a simple and effective method is proposed for measuring the focal length of a weak negative thermallyinduced lens. Generally, it is very difficult to measure the focal length larger than 1000 mm of a weak thermally-induced lens by utilizing the traditional procedures. In our experiment, we planned to construct a Yb:KGW laser system almost without the thermally-induced lens in which the focal length of the laser crystal should be measured precisely. With respect to the optical features of Yb:KGW crystal, the thermally-induced characteristics look like something of a negative lens with weak effects. The steps of measuring the focal length of a thermally-induced lens of the laser medium have been adopted as follows. First, the relationship between the focal length f1 of a positive assistant lens as well as the position of the assistant lens and the focal length fT of a thermally-induced lens were carefully analyzed and the experimental setup were designed through the theoretical simulation. Secondly, the variation of the spot size and post position for a He-Ne probe laser have been experimentally investigated after the probe laser beam passed through a thermally-induced lens (fT) and an assistant lens (f1) with the different drive currents of a pump LD with the wavelength of 980 nm. Then, the post position for a He-Ne laser beam can be obtained by use of a least square method, and then the focal length of a weak thermally-induced lens can be deduced with an indirect detection method. In this paper, we introduce a new technique for the measurement of the focal length with the absolute value large than 1000 mm of a negative lens, which has not been reported until now. The results might be useful for the evaluation of a weak thermally-induced lens of almost all solid-state lasers (SSLs).

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