21W、56MHz Nd∶YVO_4皮秒脉冲激光放大器

Research on 21 W and 56 MHz Nd…YVO_4 Picosecond Pulse Laser

报道了通过激光二极管(LD)单端抽运Nd∶YVO4晶体的三级功率放大系统,获得稳定的平均功率21 W以上的1064nm皮秒激光输出。当重复频率为56MHz、平均功率为4 W的皮秒种子脉冲注入时,经过三级功率放大,最高功率达26W,光-光转换效率达25%。皮秒单脉冲宽度为17ps,连续1h内的功率不稳定性小于2%,光束质量M2为1.5。采用RbTiOPO4(RTP)电光开关作为打标开关,实现主从脉冲比达210…1以上,可以满足打标机的需要。

Three power amplifier system is reported in which the Nd.＇YVO4 crystal is pumped by laser diode （LD）, in which 1064 nm picosecond laser output average power is more than 21 W. When the repetition frequency of 56 MHz, the average power of 3 W picosecond seed pulse is injected, a maximum power of 26 W is got by a threestage power amplifier system with the optical conversion efficiency of 25 %. The picosecond pulse duration is less than 17 ps, power instability in 1 h is less than 2%, and the light beam quality M2 is less than 1.5. A RbTiOPO4 （RTP） electro-optical switch is as a marking switch and the main-minor pulse ratio is up to 210 1, which is suitable for the use of the marking machine.