高效全固体脉冲蓝光系统实验研究

EXPERIMENTAL STUDY OF HIGH EFFICIENCY ALL-SOLID-STATE PULSED-BLUE LASER SYSTEM

用半导体抽运的Q YLF倍频激光器抽运钛宝石产生 830nm的纳秒红外光 ,再用LBO晶体对该光产生二次谐波得到 415nm的脉冲蓝光 .用 3W的YLF抽运时可产生 96 0mW基波光 ,效率达 32 % ;经倍频后输出 2 85mW的蓝光 ,倍频效率可达 32 2 % .对影响倍频效率的主要因素如基波光源腔型设计、聚焦效果、脉冲宽度等作了较详细的研究 .

The infrared ( λ 0=830?nm)nanosecond pulse is generated by pumping Ti:sapphire with diode\|\%Q\%\|YLF laser, and then the second\|harmonic blue laser (\%λ 0\%=415?nm)is obtained by frequency\|doubling with the crystal Li BO\-2(LBO). In our experiments, the fundamental wave with a power of 960?mW and corresponding harmonization of 285?mW are output from the laser system when pumping power is only 3?W. The high fundamental conversion efficiency of 32% and the second harmonic conversion efficiency of 32 2% are reached, by optimizing the design of Ti:sapphire laser system and the focusing system in frequency\|doubling. The influences of the bandwidth, the polarization and the focusing of the fundamental wave on the second\|harmonic generation are discussed.