npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

New Phys.: Sae Mulli 2021; 71: 787-793

Published online September 30, 2021 https://doi.org/10.3938/NPSM.71.787

Copyright © New Physics: Sae Mulli.

Output Optimization of a Q-switched Composite YAG/Yb:YAG/Cr:YAG laser

Youngin PARK1, Seongsu KIM2, Sungtae PARK2, Jeonghyeon JANG2, Myeongjae JANG2, Hyun Su KIM2*

1R&D Advanced Optical Research Team, Lutronic Corporation, Goyang 10534, Korea

2Department of Photonic Engineering, Chosun University, Gwangju 61452, Korea

Correspondence to:hskim21@chosun.ac.kr

Received: May 6, 2021; Revised: July 12, 2021; Accepted: July 27, 2021

Abstract

We investigated the optimal parameters of a Q-switched, a composite YAG/Yb:YAG/Cr:YAG laser. In order to design a compact and robust Q-switched Yb:YAG laser, a composite YAG/Yb:YAG/Cr:YAG laser medium fabricated by thermal diffusion bonding was used. The noise term was considered in the rate equation for numerical analysis of the effect of noise magnitude acting as the initial signal of the laser pulse. The optimal laser parameters of a composite YAG/Yb:YAG/Cr:YAG laser were determined through an analysis of a modeled Q-switched laser and the experimental results. The Q-switched laser with laser parameters such as output mirror reflectivity, resonator length, and pump beam size optimised could generate a peak power of 0.63 MW with an output energy of $\sim$1.1 mJ and a pulse duration of $\sim$1.7 ns.

Keywords: Q-switching, Composite crystal, Laser, Laser optimization, Yb:YAG

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