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报道了一种新型纳秒脉冲532 nm绿光激光器,其基频光为耗散孤子共振(DSR)方波纳秒脉冲、由掺镱光纤激光器得到,该激光器采用了全光纤主振荡功率放大(MOPA)结构设计。利用非线性偏振旋转(NPR)锁模技术,掺镱光纤激光种子源产生了稳定的DSR方波纳秒脉冲激光输出,输出激光的脉冲宽度随抽运功率的改变在3~40 ns之间可调。利用该DSR方波纳秒脉冲激光作为种子源,经过一级非保偏结构掺镱光纤纤芯放大和两级全保偏结构掺镱光纤包层放大之后,得到了平均功率为6.95 W,峰值功率为4.4 k W的脉冲激光输出。利用长度为20 mm的非线性晶体LBO作为频率转换器,得到了平均功率为2.1 W的绿光激光输出,相应的光光转换效率为30.2%。
A new type of nanosecond pulse 532 nm green laser whose fundamental frequency is dissipative soliton resonance (DSR) square wave nanosecond pulse is reported, which is obtained by Yb - doped fiber laser. The laser adopts all - fiber main oscillation power amplification MOPA) structural design. The nonlinear polarization rotation (NPR) mode-locking technique is used to produce a stable DSR square wave nanosecond pulse laser output. The pulse width of the output laser varies between 3 and 40 ns with the pumping power Tune Using the DSR square wave nanosecond pulsed laser as the seed source, the first-order non-polarization maintaining ytterbium-doped fiber core amplification and the two-stage full polarization maintaining ytterbium-doped fiber cladding amplification, the average power of 6.95 W, the peak Pulsed laser output of 4.4 kW. The green laser output with the average power of 2.1 W was obtained by using a nonlinear crystal LBO with a length of 20 mm as the frequency converter. The corresponding light-to-light conversion efficiency was 30.2%.