We report on short pulse generation from a passively Q-switched Pr³⁺:LiYF₄ laser operating at 640 nm. By reducing the cavity length and utilizing Co:MgAl₂O₄ as the saturable absorber, we obtain the shortest pulse durations from any Q-switched Pr³⁺ laser. Under pumping with a frequency-doubled optically pumped semiconductor laser at a wavelength of 479.05 nm we realized (8.5 ± 1) ns long pulses at a repetition rate of 0.78 MHz from a 7.5 mm long cavity at an average output power of 1.0 W. In that case, the laser pulse energy and duration were 1.3 µJ and 8.5 ns, respectively. The highest pulse energy amounts to 1.8 µJ at a pulse peak power of 0.19 kW in 9.2 ns pulses at a repetition rate of 0.48 MHz.

我们报告了在640 nm下工作的被动Q开关Pr ³⁺：LiYF ₄激光器产生的短脉冲。通过减小腔体长度并利用Co：MgAl ₂ O ₄作为可饱和吸收剂，我们从任何Q开关Pr ³⁺获得了最短的脉冲持续时间。激光。在波长为479.05 nm的倍频光泵浦半导体激光器的泵浦下，我们从7.5 mm长的腔以1.0 W的平均输出功率实现了重复频率为0.78 MHz的（8.5±1）ns长脉冲。在这种情况下，激光脉冲能量和持续时间分别为1.3 µJ和8.5 ns。在9.2 ns的脉冲中，以0.48 MHz的重复频率，在0.19 kW的脉冲峰值功率下，最高脉冲能量总计为1.8 µJ。