1kHz窄脉宽高峰值功率MgO∶LN电光腔倒空Nd∶YAG激光器

报道了一种1kHz窄脉冲宽度、高峰值功率的电光腔倒空1 064nm全固态激光器.该激光器采用808nm脉冲LD侧面泵浦Nd:YAG晶体棒的双凹型折叠谐振腔结构和同步延迟MgO∶LN晶体横向加压式电光腔倒空技术,通过优化设计谐振腔结构,在脉冲重复频率200Hz时,获得了最大单脉冲能量46.7mJ、脉冲宽度4.06ns、峰值功率11.50MW的1 064nm脉冲激光稳定输出,脉冲宽度和能量的峰峰值不稳定度分别为±1.52%和±2.02%;在1kHz时,最大单脉冲能量达到18.3mJ,脉冲宽度5.02ns,峰值功率3.69MW,脉冲宽度和能量的峰峰值不稳定度分别为±2.75%和±3.52%,激光束因子为3.849和3.868,远场发散角为3.46mrad和3.55mrad,束腰直径为1 508.84μm和1 477.30μm.

MgO:LN Electro-optic Crystal Cavity-dumped Nd:YAG Laser for Short Pulse Width and High Peak Power at 1 kHz

An electro-optic cavity-dumped 1064 nm solid state laser with short pulse duration and high peak power at 1 kHz repetition rate was proposed.The Nd:YAG crystal was side-pumped by an 808 nm pulsed laser diode in a folded biconcave cavity.Transverse voltage addition cavity dumping mechanism realized with a synchronously delayed MgO:LN crystal was used to generate laser pulses.Output pulses with maximum pulse energy and peak power up to 46.7 mJ and 11.5 MW were obtained,corresponding to 200 Hz repetition rate and 4.06 ns pulse duration at 1 064 nm.Peak to peak instabilities of pulse width and pulse energy were ±1.52% and ±2.02%.At the highest repetition rate of 1 kHz,the measured pulse energy,peak power and pulse duration were 18.3 mJ,3.69 MW and 5.02 ns.Peak to peak instabilities of pulse duration and pulse energy were ±2.75% and ±3.52%,corresponding to the beam quality factors of 3.849 and 3.868,far field divergence angles of 3.46 mrad and 3.55 mrad,and waist spot diamete of 1 508.84 μm and 1 477.30 μm respectively.