High Power Quasi-Continuous-Wave Diode-End-Pumped Nd:YAG Slab Amplifier at 1319 nm

We report a high power high beam quality quasi-continuous-wave(QCW)diode-end-pumped Nd:YAG slab amplifier at 1319 nm.The strongest 1064 nm parasitic oscillation has been successfully suppressed by reasonable coating design.In a five-pass configuration,the amplifier yields a 42.3 W linearly polarized 1319 nm output at repetition rate of 1 kHz with pulse duration of 75μs and beam quality factors of M^(2)_(x)=1.13 and M^(2)_(y)=2.16 in the orthogonal directions.The fluctuation of the amplifier output power is measured to be±0.6%.Furthermore,a computational model of QCW pulse amplification is employed to examine the amplification process.

基于啁啾脉冲放大技术的2W光纤绿光飞秒激光器

绿光波段的飞秒激光一般使用钛蓝宝石飞秒激光器通过倍频产生,但是钛蓝宝石激光器价格高昂,且其固体体制稳定性较差,限制了飞秒绿光激光器的使用范围。采用基于SESAM被动锁模的光纤飞秒种子源和啁啾脉冲放大(Chirped Pulse Amplification,CPA)技术产生1030 nm的基频光,经过压缩倍频后,实现了脉宽357 fs、平均功率2.187 W的515 nm飞秒激光输出。该飞秒激光器具备基频光与倍频光双波长切换输出的能力,且具有体积紧凑、脉冲稳定、转换效率较高、光束质量良好的优势,可作为超快激光加工系统的光源。

端面泵浦皮秒再生放大器

Nd∶YVO4晶体一般采用808 nm激光作为泵浦源,但是其强烈的吸收导致了严重的热效应,限制了激光输出功率和光束质量。采用了吸收相对较弱的888 nm激光作为泵浦源,显著降低了Nd∶YVO4晶体在高泵浦功率下的热效应;结合自主研发的全光纤结构皮秒种子源,利用再生放大器,实现了脉冲宽度12.1 ps、重复频率100~500 k Hz、最高单脉冲能量超过250μJ的1064 nm皮秒激光输出。该再生放大器具备体积紧凑、脉冲稳定、单脉冲能量较高、转换效率较高、光束质量良好的优势,可直接或继续放大后作为超快激光加工系统的光源。