Bian Qi, Bo Yong, Zuo Jun-Wei, Feng Lu, Gao Hong-Wei, Yuan Lei, Cui Da-Fu, Peng Qin-Jun, Chen Hong-Bin, Xu Zu-Yan
Opt Lett. 2020 Apr 1;45(7):1818-1821. doi: 10.1364/OL.383136.
A 100 W level kilohertz repetition-rate microsecond (µs)-pulse all-solid-state sodium beacon laser at 589 nm is demonstrated for the first time, to the best of our knowledge, via combining two independent µs-pulsed lasers. Each beamlet is generated by the sum-frequency mixing of pulsed 1064 and 1319 nm lasers in a lithium triborate (LBO) crystal, which operate at 500 Hz pulse repetition frequency with 61 W $p$p-polarized and 53 W $s$s-polarized output, respectively. An incoherent sequence combining technology of polarized laser beams is employed to add the two beamlets. The average power of the combined beam is up to 107.5 W with a combining efficiency of 94.3%. The combined beam has a 1 kHz repetition rate with ${\sim}{120};\unicode{x00B5} {\rm s}$∼120µs pulse duration and beam quality ${M^2} = {1.41}$M=1.41. The central wavelength with a linewidth of ${\sim}{0.3};{\rm GHz}$∼0.3GHz is locked to a sodium ${{\rm D}_{2a}}$D absorption line. To the best of our knowledge, this is a record-high power operating at kilohertz for µs-pulsed solid-state sodium beacon lasers.
据我们所知，首次通过组合两台独立的微秒脉冲激光器，演示了一台100瓦级、千赫兹重复频率、微秒（µs）脉冲的589纳米全固态钠信标激光器。每个子光束由脉冲1064纳米和1319纳米激光器在三硼酸锂（LBO）晶体中进行和频混合产生，这两台激光器分别以500赫兹的脉冲重复频率运行，输出功率分别为61瓦的p偏振光和53瓦的s偏振光。采用偏振激光束的非相干序列组合技术将两个子光束相加。组合光束的平均功率高达107.5瓦，组合效率为94.3%。组合光束的重复频率为1千赫兹，脉冲持续时间约为120微秒，光束质量M² = 1.41。中心波长线宽约为0.3吉赫兹，被锁定到钠D₂a吸收线。据我们所知，这是微秒脉冲固态钠信标激光器在千赫兹频率下运行的创纪录高功率。
