The filters always been used as a window which can make a part of light go though at the same time stop a part of light going though .This kind of glass is always used for laser gun then the gun can emmit the single-wave light .If it is used in some instrument ,the light which goes through the glass can be filtered into single-wave light .

Comonly products: IR cut off filiters, Near-infrared filters, Infrared filters, Bandpass filters, Long wave pass filters, Narrowband filters, Negative filters and so on.

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