A 3–5 μm mid-infrared band is a good window for atmospheric transmission. It has the advantages of high contrast and strong penetration under high humidity conditions. Therefore, it has important applications in the fields of laser medicine, laser radar, environmental monitoring, remote sensing, molecular spectroscopy, industrial processing, space communication and photoelectric confrontation. In this paper, the application background of mid-infrared laser is summarized. The ways to realize mid-infrared laser output are described by optical parametric oscillation, mid-infrared solid-state laser doped with different active ions and fiber laser doped with different rare earth ions. The advantages and disadvantages of various mid-infrared lasers are briefly described. The technical approaches, schemes and research status of mid-infrared lasers are introduced.
In view of the advantages of 1.6-μm laser, it has important applications in the fields of laser radar, industry, military, and optical communication. This paper mainly focuses on 1.6-μm Er: YAG solid-state-laser for Laser Radar. The references about pulsed 1.6-μm single-longitudinal-mode laser, continuous wave 1.6-μm Er: YAG single-longitudinal-mode seed laser, and pulsed 1.6-μm Er: YAG Q-switched amplifier are collected and analyzed. The development status is introduced, the main problems are identified, and the future development direction is clarified. Maybe, this can provide a reference for other scholars.
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