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 Home > Filters > Bandpass Filters > Visible Bandpass > 440nm +/-20nm Visible Narrow Bandpass Filter, Blue Filter
440nm +/-20nm Visible Narrow Bandpass Filter, Blue Filter

Centre Wavelength(CWL):
440nm+/-2nm, T=50% @ 420nm, 460nm
FWHM(50% point):
40+/-2nm, 420-460nm
Tave>85% at CWL=420nm. Tave<0.1% @ 200-400nm, 500-1100nm
customized, from 2x2mm to Dia. 110mm, +/-0.1mm
Surface quality:
Clear aperture:
>90%, or full surface coatings
vary customized, such as B270, BK7, crystal, float or sodalime glass etc.
Singlet filter with coatings
Hard coatings to resist scratch and long term operation
Ion source assisted coating to reach a heat resistance, such as 70 C-degree, small temperature drift.
Deep Cutoff @ Tave<0.1%
Compatible with 440nm laser LED light or 440nm Blue Light-emitting Diode.

440+/-20nm Narrow Bandpass filter, only allow the visible blue range spectrum transmit, while deeply cut off the other spectrums, also called Blue Narrow Bandpass Filter or Blue interference filter.

 Application: 440nm laser LED light or 440nm Blue Light-emitting Diode, medical inspection device, fluorescence microscope or analytical instrument, printing ink identification.

440+/-10nm Supper Narrow Bandpass Filter, with FWHM=20nm and high transmission, also called 440nm Laser Interference Filter, more suitably used for 440nm blue laser devices.

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