68*15*1mm 690nm JGS1 Quartz Optical Bandpass Filter

68*15*1mm 690nm laser filter lens JGS1 quartz for laser beauty machine Optical equipment laser machine

Optical filter:

An optical device used to select the desired radiation band. One of the common features of filters is that no filter can make the image of the celestial body brighter, because all filters will absorb certain wavelengths, making the object darker

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