高重频风冷声光调Q光纤激光器实验研究  

Experiment research of high repetition rate acousto-optic Q-switched fiber laser under air cooling

作　　者：陈鹏飞[1] 伍波[1] 沈琪皓[1] 何幸锴[1] 

机构地区：[1]西南技术物理研究所,成都610041

出　　处：《激光技术》2015年第6期780-784,共5页Laser Technology

基　　金：国家自然科学基金资助项目(2011YQ110059)

摘　　要：为了实现功率稳定的风冷高重频脉冲光纤激光器,采用主振荡功率放大结构,对声光调Q的全光纤激光器进行了研究。振荡级采用声光调Q方案,以光纤光栅对为激光器腔镜,915nm激光二极管连续抽运,得到了中心波长1064nm、重复频率10k Hz到130k Hz可调的激光脉冲输出。采用两级大模场双包层光纤放大,实现了平均功率101W、脉冲宽度328.1ns、3d B光谱宽度0.6nm的激光输出。第二放大级光光转换效率69%,激光器总光光转换效率达62.7%。分析了声光调Q产生的宽种子光脉冲经放大后发生波形畸变的原因。结果表明,采用915nm抽运波长提高了激光器输出激光功率稳定性,在风冷的情况下输出功率长期稳定性优于2%。In order to obtain the air cooling high repetition fiber laser with stable power,an acoustic-optical Q-switched allfiber laser with master oscillator power amplifier structure was studied. The oscillator used the scheme of acousto-optic Q-switched with a pair of fiber Bragg grating as laser cavity mirrors. Pumped by 915 nm laser diodes,1064 nm laser pulse output was acquired with adjustable repetition rates from 10 k Hz to 130 k Hz. Through two-stage double clad large mode area fiber amplifier,101 W output power was obtained with 328. 1ns pulse width. The 3d B optical spectrum width of fiber laser was 0. 6nm. Optical-optical efficiency of the second amplifier stage was 69%. The total optical-optical efficiency of laser was 62. 7%. The distortion cause of long width seed pulse created by acousto-optic Q-switched through the amplification was studied. The experimental results show that pumped by 915 nm laser diodes,the long-term stability of output power is proved to less than 2% under air cooling.

关 键 词：激光技术 全光纤激光器 主振荡功率放大 声光Q开关 功率稳定性 

分 类 号：TN248.1[电子电信—物理电子学]