Opt Express. 2023 May 8;31(10):16118-16126. doi: 10.1364/OE.485419.
In this letter, a sub-pm linewidth, high pulse energy and high beam quality microsecond-pulse 766.699 nm Ti:sapphire laser pumped by a frequency-doubled Nd:YAG laser is demonstrated. At an incident pump energy of 824 mJ, the maximum output energy of 132.5 mJ at 766.699 nm with linewidth of 0.66 pm and a pulse width of 100 µs is achieved at a repetition rate of 5 Hz. To the best of our knowledge, this is the highest pulse energy at 766.699 nm with pulse width of hundred micro-seconds for a Ti:sapphire laser. The beam quality factor M is measured to be 1.21. It could be precisely tuned from 766.623 to 766.755 nm with a tuning resolution of 0.8 pm. The wavelength stability is measured to be less than ±0.7 pm over 30 min. The sub-pm linewidth, high pulse energy and high beam quality Ti:sapphire laser at 766.699 nm can be used to create a polychromatic laser guide star together with a home-made 589 nm laser in the mesospheric sodium and potassium layer for the tip-tilt correction resulting in the near-diffraction limited imagery on a large telescope.
在这封信中，演示了一种亚皮米线宽、高脉冲能量和高光束质量的微秒脉冲 766.699nm Ti:sapphire 激光，由倍频 Nd:YAG 激光泵浦。在 824mJ 的入射泵浦能量下，在 5Hz 的重复率下，在 766.699nm 处获得了 132.5mJ 的最大输出能量，线宽为 0.66pm，脉冲宽度为 100µs。据我们所知，这是在 766.699nm 处具有百微秒脉冲宽度的 Ti:sapphire 激光的最高脉冲能量。光束质量因子 M 被测量为 1.21。它可以以 0.8pm 的调谐分辨率从 766.623nm 精确调谐到 766.755nm。在 30 分钟内，波长稳定性被测量为小于±0.7pm。766.699nm 的亚皮米线宽、高脉冲能量和高光束质量 Ti:sapphire 激光可以与自制的 589nm 激光一起用于中高层钠钾层的多色激光导星，用于倾斜校正，从而在大望远镜上实现近衍射极限成像。
