Er³⁺:GGG(Er doped GGG) Laser Crystal have a garnet structure. At the same time, it is durable under mechanical stress and can withstand high temperatures. In addition, Er: GGG crystals have very high quantum efficiency and are an important competitor of eye-safe near-infrared laser systems. Compared with YAG and Yalo3, the I_11/12 metastable energy level of GGG crystal has a longer lifetime, indicating that it can be effectively upconverted under infrared pumping

Er: GGG Crystal —— Laser Crystal For Compact Mid-Infrared Laser 

a 600um thick Er:GGG crystal with a wavelength similar to 2.7um. The maximum output power generated is 50.8 mW and the maximum pulse energy is 0.306 mJ. The repetition frequency of Puguang is 300, 200 and 100 Hz respectively. The maximum tilt efficiency of the laser is 20.1%. The laser is operated in a single longitudinal mode with a FWHM of 0.42 nm centered at approximately 2704 nm. These results show that the Er: GGG microchip laser is an ideal pump source for potential mid-infrared OPO lasers, which can be used in many fields such as photoelectric countermeasures, lidar and environmental monitoring.