일체형 YAG/Yb:YAG/Cr:YAG 레이저 공진기에서 1×2 Q-스위칭 펄스 배열 빔의 시간 동기화에 관한 연구

Abstract

In this study, we investigate the temporal-synchronization of the 1×2 Q-switching pulse array beam oscillating inside the laser resonator composed of a composite YAG/Yb:YAG/Cr:YAG laser medium, and the stabilization of the laser output power by a Fabry-Perot etalon. And, the simple laser rate equation was derived to analyze the coupling effect between the two Q-switching pulses in the array. As a result of the theoretical and experimental analysis, it was found that the time delay between the two pulses varied according to the distance between two gain waveguides. The closer the distance between the two gain waveguides is, the stronger the coupling effect between the two Q-switching pulses. The experimental results show the same tendency as the theoretical results. In order to stabilize the output power of the designed laser, we reduced the number of longitudinal resonator modes by inserting an Faby-Perot etalon inside the resonator. We shown that the laser output power was stable when only two longitudinal modes were lased by the etalon.