A 780nm longpass filter is an optical filter that transmits light with wavelengths longer than 780nm, while blocking or attenuating light with shorter wavelengths.

The primary application of a 780nm longpass filter is in optical systems that require the separation of near-infrared light (NIR) from visible light or shorter-wavelength light. For instance, in fluorescence microscopy, a 780nm longpass filter can be used to block visible light and shorter-wavelength excitation light while allowing the longer-wavelength emission light to pass through. This results in a high signal-to-noise ratio for the detection of NIR fluorescence.

Coligh’s stock standard 780nm longpass filter:

• Type: longpass filter
• Coating: Hard coated
• Angle of incidence: 0°
• Wavelength cut on tolerance :780+/-10nm
• Blocking depth: >=OD4 >90%@800-1100nm
• Thickness: 1.0mm, 1.1mm, 0.5mm, 0.7mm
• Surface quality: 80/50, 60/40
• Size: smaller than 100*100mm

Custom option:

• Cut on and cut off wavelength: custom
• Working wavelength: according to client’s request
• Material and thickness: according to client’s request
• Surface quality: 40/20 is in option
• Size: Any size round or square smaller than 100*100mm