We report on the output performances of a fiber-coupled diode pumped Nd:LGSB laser passively Q-switched by a Cr⁴⁺:YAG saturable absorber (SA), with emissions at 1.06-μm near-infrared wavelength, as well as at 0.53-μm visible green spectrum through the self-frequency doubling process. The 2.3-at.% Nd:LGSB crystal delivered 1.43 W continuous-wave power at 1.06 μm with an overall optical-to-optical efficiency (with respect to the absorbed pump power) of 0.50. Green light with 3.3-mW power was emitted in a free-generation regime at 1.95-W absorbed pump power. By employing a Cr⁴⁺:YAG SA crystal with initial transmission T_i = 0.89, laser pulses at 1.06 μm with 13.4-μJ energy at 17.1-kHz repetition rate were obtained for ∼1.8 W absorbed pump power. The green laser pulse energy was 0.21 μJ at a 37.7-kHz repetition rate. The pulse duration amounted to 4.8 ns for both wavelengths of emission, indicating pulse peak power of 2.8 kW and 43.7 W for operation at 1.06 μm and 0.53 μm, respectively.

中文翻译：

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二极管泵浦双功能Nd：LGSB激光器通过Cr ⁴⁺：YAG饱和吸收剂被动调Q

我们报告了由Cr ⁴⁺：YAG饱和吸收器（SA）被动调Q的光纤耦合二极管泵浦Nd：LGSB激光器的输出性能，其发射在1.06-μm的近红外波长以及0.53处通过自倍频过程获得-μm的可见绿色光谱。2.3％的Nd：LGSB晶体以1.06μm的功率提供了1.43 W的连续波功率，总的光学效率（相对于吸收的泵浦功率）为0.50。在吸收功率为1.95W的自由发电状态下，以3.3mW的功率发出绿光。通过使用具有初始透射率T _i的Cr ⁴⁺：YAG SA晶体= 0.89，在〜1.8 W吸收泵浦功率下，以17.1 kHz的重复频率获得了1.06μm的激光脉冲和13.4μJ的能量。在37.7 kHz的重复频率下，绿色激光脉冲能量为0.21μJ。对于两种发射波长，脉冲持续时间总计为4.8 ns，表明分别在1.06μm和0.53μm下工作的脉冲峰值功率为2.8 kW和43.7W。