A diode-end-pumped Er:CaF₂-SrF₂ laser actively Q-switched by a TeO₂ acousto-optic crystal was demonstrated for the first time, to our best knowledge. By setting the repetition rate of radio frequency signal, 2.73 μm Q-switched lasers with repetition rates of 100–1000 Hz were obtained. With 100 Hz repetition rate, a 390 μJ pulse energy and a 176 ns pulse duration were employed at an absorbed pump power of 2.17 W, and the corresponding peak power was 2.2 kW. These results prove that Er³⁺-doped CaF₂–SrF₂ crystal is promising for actively Q-switched laser with high peak power in the mid-infrared region.

中文翻译：

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声光调Q的Er：CaF ₂ -SrF ₂激光器，波长2.73μm

据我们所知，首次展示了由TeO ₂声光晶体主动调Q的二极管端泵浦Er：CaF ₂ -SrF ₂激光器。通过设置射频信号的重复频率，可以得到2.73μm的Q开关激光器，其重复频率为100–1000 Hz。在100 Hz重复频率下，在2.17 W的吸收泵浦功率下使用390μJ脉冲能量和176 ns脉冲持续时间，相应的峰值功率为2.2 kW。这些结果证明，掺Er ^3+的CaF ₂ -SrF ₂晶体对于在中红外区具有高峰值功率的有源Q开关激光器很有希望。