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Window plates -- germanium, silicon-based window plates, sapphire, zinc selenide
Window AR + DLC coating -- Diamond-like carbon (DLC) film
Filter -- Bandpass filter
Filter -- Narrowband filter
Filter -- Sapphire beauty instrument filter
Dichroic filter -- Dichroic filter
Dichroic filter - Polarizing beam splitter
Dichroic filter -- Polarization-independent beam splitter
Mirrors -- gold, silver, aluminum mirrors
Reflective mirror - dielectric high-reflection mirror
Ultraviolet broadband film