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| Home > Filters > Bandpass Filters > Visible Bandpass > 440nm +/-20nm Visible Narrow Bandpass Filter, Blue Filter |
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| 440nm +/-20nm Visible Narrow Bandpass Filter, Blue Filter |
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Specifications:
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Centre Wavelength(CWL):
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440nm+/-2nm, T=50% @ 420nm, 460nm
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FWHM(50% point):
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40+/-2nm, 420-460nm
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Transmission:
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Tave>85% at CWL=420nm. Tave<0.1% @ 200-400nm, 500-1100nm
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Size:
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customized, from 2x2mm to Dia. 110mm, +/-0.1mm
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Thickness:
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0.3~3mm
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Surface quality:
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60/40~20/40
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Clear aperture:
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>90%, or full surface coatings
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Substrate:
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vary customized, such as B270, BK7, crystal, float or sodalime glass etc.
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¡ñ Singlet filter with coatings
¡ñ Hard coatings to resist scratch and long term operation
¡ñ Ion source assisted coating to reach a heat resistance, such as 70 C-degree, small temperature drift.
¡ñ Deep Cutoff @ Tave<0.1%
¡ñ Compatible with 440nm laser LED light or 440nm Blue Light-emitting Diode.
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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.
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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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