基于SESAM被动调Q的激光二极管泵浦Yb∶CaYAlO_4脉冲激光器

Output characteristics of diode-pumped passively Q-switched Yb ∶CaYAlO_4 pulsed laser based on a SESAM

采用发射波长约为976 nm的半导体激光器作为泵浦源,Yb^(3+)掺杂浓度为1. 5at.%、通光长度为2 mm的Yb∶CaYAlO_4晶体作为增益介质,本文提出了一种基于半导体可饱和吸收镜(SESAM)被动调Q的激光二极管泵浦Yb∶CaYAlO_4以获取稳定脉冲输出的方案。通过合理设计谐振腔,实现了稳定的被动调Q激光脉冲输出,并分析了泵浦功率的大小对输出脉冲的重复频率、脉冲宽度、单脉冲能量以及脉冲峰值功率的影响。

By utilizing a fiber-coupled laser diode emitting at a wavelength of around 976 nm as a pump source and a Yb∶CaYAlO4 crystal with a Yb^3+ion doping concentration of 1.5at.%and a thickness of 2 mm as the gain medium,a scheme of laser diode-pumped Yb∶CaYAlO4 for passively Q-switched pulsed lasers using a semiconductor saturable absorber mirror(SESAM)is proposed.By reasonably designing the resonant cavity,a stable passively Q-switched pulsed output is achieved.Furthermore,the influence of the pump power on the pulse repetition rate,pulse width,single pulse energy and peak power are analyzed.