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Band Pass Filter

Bandpass Filter

Bandpass filters allow a specific wavelength range to pass, and attenuate wavelengths outside of that range. Foreal offers both ultra narrow (<2nm) and ultra broad (>50nm) bandpass filters.

Typical Spectrum:



Typical Specification:


     4mm ~ 80mm, round or square

     Center Wavelength (CWL)

     340nm ~ 1570nm

     Full Width at Half Maximum (FWHM)

     0.3% ~ 0.6% of CWL

     Transmission at CWL

     >70% (Or Custom Design)

     Cut-off Wavelength

     UV – NIR


      >OD4 or OD6

     Slope (T=1% to T=90%)



Key Features:

•    High Transmission

•    Deep Blocking

•    Steep Slope

•    Stable Ripple at Band Pass

•    Excellent Environmental Stability

Laser Induced Damage Threshold (LIDT)

Laser Induced Damage Threshold for Ion Beam Sputtered (IBS) Coating