Teng Mingyang, Meng Xianghao
School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China.
Sensors (Basel). 2024 Aug 13;24(16):5240. doi: 10.3390/s24165240.
We demonstrate femtosecond ultra-stable green laser generation by an ytterbium-doped polarization-maintaining fiber laser with a 2.4 mm long lithium triborate (LBO) crystal. We generated 5.6 W of femtosecond green light at 520 nm for a fundamental power of 12 W, which corresponds to a conversion efficiency of 46.7%. The fiber chirped-pulse amplifier, which has an environmentally immune front end, delivered 170 fs pulses at a 75 MHz repetition rate centered at 1040 nm. According to the dispersion of the optical material in a double-frequency setup, the introduced dispersion had a negligible effect for the green laser, and the pulse duration of the generated green laser was calculated to be 171 fs, resulting in an excellent power stability, with fluctuation as low as 0.16% of the generated green light. This system could be of great interest in ultrafast optical and photobiology research.
我们展示了一种通过掺镱保偏光纤激光器与一块2.4毫米长的硼酸三锂（LBO）晶体产生飞秒超稳定绿光激光的方法。我们在12瓦的基频功率下，在520纳米处产生了5.6瓦的飞秒绿光，这对应着46.7%的转换效率。该光纤啁啾脉冲放大器具有对环境免疫的前端，以75兆赫兹的重复频率在中心波长为1040纳米处输出170飞秒的脉冲。根据双频设置中光学材料的色散情况，引入的色散对绿光激光的影响可忽略不计，计算得出所产生的绿光激光脉冲持续时间为171飞秒，从而实现了出色的功率稳定性，功率波动低至所产生绿光的0.16%。该系统在超快光学和光生物学研究中可能会引起极大的兴趣。
