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2.79μm激光器在医疗、非线性光学、军事等方面具有重要的应用价值,介绍了Cr,Er:YSGG晶体的物理、化学及激光特性,重点分析了2.79μm Cr,Er:YSGG固体激光器的发展现状,以及存在的主要问题,阐述了其可能的发展前景。Cr,Er:YSGG激光器可以使用脉冲闪光灯或激光二极管泵浦,并使用电光、声光、被动调Q等方法调Q输出高峰值功率2.79μm激光,二极管泵浦时激光器可以连续输出。Cr,Er:YSGG晶体的热导率低,泵浦过程中热透镜效应严重,因此,激光器不适合高重复频率工作,输出功率受到一定的限制。实现稳定可靠的2.79μm调Q巨脉冲激光输出需要解决的关键技术是获得对2.79μm激光吸收系数小,破坏阈值高的Q开关材料。
2.79μm lasers have important applications in medical, nonlinear optics and military fields. The physical, chemical and laser properties of Cr, Er: YSGG crystals are introduced. The development of 2.79μm Cr, Er: YSGG solid state lasers , As well as the main problems that exist, expounds its possible development prospects. Cr, Er: YSGG lasers can be pulsed or laser diode-pumped, and use the electro-optic, acousto-optic, and passive Q-switching methods to tune the Q output to a peak power of 2.79μm. The laser can be continuously output when the diode is pumped. The thermal conductivity of Cr and Er: YSGG crystals is low, and the thermal lens effect is serious during the pumping process. Therefore, the laser is not suitable for high repetition frequency operation and the output power is limited to some extent. The key technology to achieve a stable and reliable 2.79μm Q-switched giant pulse laser output is to obtain a Q-switched material with a small absorption coefficient of 2.79μm and high damage threshold.