An 808nm optical bandpass filter FWHM 40nm is designed to selectively transmit near-infrared (NIR) light centered around 808 nanometers (nm) wavelength while blocking other wavelengths outside this range. This filter is used in optical systems that need precise control over the light spectrum for applications such as laser systems, fluorescence imaging, and spectroscopy.

Key features of the 808nm bandpass filter with a full-width at half-maximum (FWHM) of 40nm:

• Central Wavelength (CWL): 808 nm – The filter is optimized to transmit light centered around this wavelength.
• FWHM: 40 nm – This indicates that the filter will allow light to pass within a bandwidth of 40 nm (typically ±20 nm on either side of the central wavelength, i.e., 788 nm to 828 nm). FWHM refers to the wavelength range over which the filter transmits at least half of the maximum transmission intensity.
• Blocking: The filter blocks wavelengths outside the desired range, reducing interference from other spectral bands.
• Transmission Efficiency: High transmission of light within the desired band for maximum efficiency in the 808 nm region.

Coligh’s stock standard 808-40nm bandpass filter spectrum feature:

• Feature: NIR bandpass filter
• Center wavelength: 808±5nm
• FHWM: 40±5nm
• Blocking range: 300-1100nm
• Blocking depth:OD3
• Transmission average: ≥90%
• Size: Any size below 100*100mm

Custom option:

• Bandwidth: 10nm, 20nm, 30nm, 35nm, 45nm,  50nm, 55nm, 60nm or any other bandwidth
• Blocking depth: OD2, OD4, OD5 is availiable
• Thickness：0.5mm, 0.55mm, 0.7mm, 1.0mm, 1.1mm
• Size: round or square smaller than 100*100mm
• Material thickness: Depend on request
• Transmission and blocking rang: custom as per requirement or between 200nm to 1500nm