3~5μm波段中红外激光在医疗、环保、军事等领域有着广泛的应用。固体激光器泵浦的光参量振荡器(OPO)是目前获得3~5μm激光的常用方式,是激光器领域研究的热点,国外已有报道采用ZGP-OPO方式获得27.1W的3~5μm激光。介绍了OPO获得3~5μm激光的技术途径,以及中红外OPO的研究进展和在各个领域的应用。 3 ~ 5μm band mid-infrared laser in the medical, environmental protection, military and other fields have a wide range of applications. Solid-state laser pumped optical parametric oscillator (OPO) is a commonly used method to obtain 3 ~ 5μm laser. It is a hot research field in laser field. It has been reported in foreign countries that ZGP-OPO method can obtain 27.1W 3 ~ 5μm laser. Introduced the OPO access to 3 ~ 5μm laser technology, as well as the research progress of mid-infrared OPO and its application in various fields.