The mid-infrared laser of 2-3um shows important application value and broad prospect in the field of molecule spectroscopy,remote sensing,infrared countermeasure（IRCM),free space and communication satellite, as well as medical science.
Cr2+:ZnSe and Cr2+:ZnS crystals can be used as laser crystals to achieve the output of tunable laser in the 1.9-3μm band. Besides, It has excellent optical properties:they are suitable for LD direct pumping laser operation at room temperature; there is almost no thermal quenching phenomenon; the broader absorption band and the almost non-existent excited state absorption(ESA) determines that there are many options for its pump source. such as LD, Er, Tm fiber lasers and Tm, Ho doped all-solid-state lasers.
The broader absorption band and the almost non-existent excited state absorption(ESA) also make Cr2+:ZnSe and Cr2+:ZnS crystals saturable absorber and ideal choices for passive Q-switched lasers in the "eye-safe" wavelength range and solid-state lasers of 1.5-2.1µm wavelength.
Examples of Cr2+:ZnS crystal and Cr2+:ZnSe
Examples of Cr2+:ZnSe crystal as gain material
Examples of Cr2+:ZnSe crystal as saturable absorber: Pulse Width is 20.96ns
Examples of Cr2+:ZnS crystal as saturable absorber: Pulse Width is 10ns
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ZnSe/ZnS crystals doped with Cr2+, Co2+ and Fe2+ by a diffusion doped method with Chengdu Dien Photoelectric Technology Co., Ltd.
