激光雷达用高性能光纤激光器

系统研究了窄线宽低噪声单频连续光纤激光器、高能量纳秒长脉冲单频光纤激光器以及高峰值功率纳秒短脉冲光纤激光器三类高性能光纤激光器:实现了工作于1、1.5及2 m波段的单频连续光纤激光器，典型光谱线宽小于3 kHz，强度噪声接近于散粒噪声极限；实现了高能量单频光纤激光器，脉冲能量超过200 J，重复频率20 kHz，脉冲宽度100~500 ns，激光波长位于1.5 m波段；实现了高峰值功率纳秒短脉冲光纤激光器，峰值功率超过700 kW，重复频率10 kHz，脉冲宽度3 ns；同时还实现了高重频高峰值功率纳秒短脉冲光纤激光器，峰值功率超过200 W，重复频率3 MHz，脉冲宽度1~5 ns。文中阐述了以上几类高性能光纤激光器在激光雷达探测系统中的应用前景。

High-performance fiber lasers for LIDARs

Three kinds of high-performance fiber lasers were systematically investigated including the single frequency continuous wave (CW) fiber lasers with narrow linewidth and low relative intensity noise (RIN), the high energy long-nanosecond-pulsed single frequency fiber lasers and the high peak power short-nanosecond-pulsed fiber lasers. The single frequency CW fiber lasers operating in 1 m, 1.5 m and 2 m regions were developed. The typical spectral linewidth was less than 3 kHz and the RIN approached the short noise limit. One high energy nanosecond pulsed single frequency fiber laser in 1.5 m region was developed. It can produce 200 J single frequency laser pulses with 100-500 ns pulse width at 20 kHz repetition rate. A fiber laser producing pulses with 700 kW peak power, 3 ns pulse width at 10 kHz was developed. High repetition rate (up to 3 MHz) nanosecond fiber lasers was also developed, which can provide 1-5 ns laser pulses with 200 W peak power. The applications of these lasers in laser LIDARs are addressed in this paper.