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650+940nm Narrow Double Bandpass Filter

Centre Wavelength(CWL):
650nm and 940nm, TOL +/-2nm
FWHM(50% point):
Customized, 6nm, 10nm, 30nm etc.
T>80% at CWL=650nm and 940nm
customized, from 2x2mm to Dia. 110mm, +/-0.1mm
Surface quality:
Clear aperture:
>90%, or full surface coatings
vary customized, such as B270, BK7, sodalime glass etc.
High transmission at the CWL, from 80% ~ 95% according to the bandwidth.
Precise point of the CWL, with Ion source assisted coating method to reach a steady coatings.
Singlet substrate with coatings
Narrow bandpass filter, with coatings made on a singlet substrate, is designed to instead of the bonded method, which usually bond 2 or 3 different types of bandpass filters for the function of double narrow bandpass. LenOpTec have designed and produced some special types of double bandpass filters for some special application, such as 650+940nm and 650+ 850nm types.
Triple Bandpass Filters in visible light range are also available for design and development, such as 465+550+650nm triple bandpass filter, which transmit the red, green and blue light in the single filter.
Application: measuring instrument, medical treatment device, mobile projector, NIR touch screen etc.

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