LD泵浦的kHz,Er3+,Yb3+:glass被动调Q微片激光器

目前1.5m LD泵浦铒玻璃被动调Q微型激光器是军事激光测距的研究热点，获得较高的激光重复频率和单脉冲能量尤为重要。文中主要报道了一种应用于激光测距领域的铒镱共掺磷酸盐玻璃被动调Q微片激光器。激光器采用中心波长为940 nm的单管二极管为泵浦源，铒镱共掺磷酸盐玻璃（Er3+，Yb3+:glass）作为增益介质，CO2+:MgAl2O4（CO:MALO）作为可饱和吸收体。通过分析泵浦光斑半径对模式匹配影响，优化泵浦光斑半径，实验分析可饱和吸收体初始透过率T0和输出镜反射率R对输出激光参数影响，优化T0和R值。最终实验中采用增益预泵浦方式，实现重频1 kHz，单脉冲能量40 J，脉宽5.09 ns，峰值功率7.85 kW，光束质量M2=1.4，波长1 535 nm的稳定激光输出。

LD pumped kHz Er3+, Yb3+: glass passively Q-switched microchip lasers

At present, 1.5 m LD pumped Er-glass passively Q-switched micro-laser is a popular research direction in military laser ranging. Achieving high repetition rate and single pulse energy are very important indicators. In this paper, a kHz erbium-ytterbium co-doped phosphate glass passively Q-switched microchip laser for laser ranging was reported. The laser was pumped by a single diode with a center wavelength of 940 nm and erbium-ytterbium co-doped phosphate glass (Er3+,Yb3+:glass) as the gain medium, CO2+:MgAl2O4 (CO:MALO) as the saturable absorber. By analyzing the influence of the pump spot radius on the mode-matching, the pump spot radius was optimized. The effects of the initial transmittance (T0) of saturable absorber and the reflectance R of output mirror on the output laser parameters were experimentally analyzed. In the final pre-pumping experiment, a Q-switched pulse was achieved, with repetition frequency of 1 kHz, wavelength of 1 535 nm, single pulse energy of 40 J, pulse width of 5.09 ns, peak power of 7.89 kW and beam quality of 1.4.