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Land Mobile Radio (LMR) is a private real-time communication typically featured with push-to-talk activities, which can be realized via portables, mobiles, or base station units. Compared to public network communication, LMR ensures trusting communication during emergencies. LMR can carry out networking communication in complex terrain and signal coverage blind areas, providing robust communication for users.

Calcium fluoride (CaF2) crystals have excellent transmittance between 250 nm and 7 μm, which is widely used in making beam splitters, windows, and lenses. It has good transmittance in the ultraviolet, visible, and infrared wavebands, so it is widely used in the technologies of lasers, ntrared otcs, ultravolet optics, and energy detectors, et cetera.