LD泵浦全固态355nm紫外皮秒脉冲激光器

利用激光二极管（LD）端面抽运Nd∶YVO4激光晶体皮秒三倍频355nm全固态紫外激光器，采用半导体可饱和吸收镜（SESAM）锁模技术及皮秒再生放大技术，对1 064 nm基波采用Ⅰ类相位匹配Li3B3O5（LBO）晶体二倍频和Ⅱ类相位匹配LBO晶体三倍频，获得了稳定性好、倍频效率较高的355 nm紫外激光输出。当二极管泵浦功率为5 W时，获得了脉宽为17 ps、重复频率为1 Hz、单脉冲能量为129.6 J的稳定三倍频紫外激光输出，基频光到二倍频光和三倍频光的转换效率分别达到60.3%和16.6%，3 h输出单脉冲能量的抖动在0.58%以下。

LD-pumped all-solid-state 355 nm ultraviolet picosecond pulse laser

A laser diode (LD) end-pumped Nd∶YVO4 all-solid-state ultraviolet picosecond(PS) pulse laser was demonstrated under the semiconductor saturable absorption mirror(SESAM) mode-locking technology and the PS pulse laser regeneration amplifier technology, by using the type Ⅰ phase-matched LiB3O5(LBO) as the second harmonic generation(SHG) crystal and the type Ⅱ phase-matched LBO as the third harmonic generation(THG) crystal. Finally, the 355 nm UV laser was obtained with 129.6 μJ single pulse energy, 17 ps pulse width at 1Hz repetition rate while the pump power was 5 W. The third harmonics were up to 60.3% conversion to 532nm and 16.6% to 355nm and the single pulse energy fluctuation was less than 0.58% in 3h operation.