A 905nm bandpass filter with a full-width at half-maximum (FWHM) of 30nm is a type of optical filter that allows light with wavelengths within a narrow range around 905nm to pass through while blocking other wavelengths. The FWHM value indicates the range of wavelengths that can pass through the filter, with a higher FWHM indicating a wider range of allowed wavelengths.

This type of filter is commonly used in applications such as:

• Medical equipment: 905nm bandpass filters are often used in medical equipment, such as non-invasive diagnostic tools, laser-based surgical instruments, and imaging devices.
• Industrial sensing and monitoring: 905nm bandpass filters can be used in industrial applications, such as sensing and monitoring equipment, to detect and measure specific gases, liquids, or materials that emit light within the 905nm range.
• Telecommunications: 905nm bandpass filters are also used in telecommunications, particularly in optical fiber communication systems.

Coligh’s stock standard 905nm optical bandpass filter FWHM 30nm feature:

• Feature: NIR bandpass filter
• Center wavenelgth: 905±5nm
• FWHM: 30±5nm
• Blocking range: 200-1100nm
• Blocking depth: OD3
• Transmission average: Above 90%
• Thickness：0.5mm, 0.55mm, 0.7mm, 1.0mm, 1.1mm
• Size: Any size below 100*100mm

Custom option:

• Bandwidth: 10nm, 20nm, 30nm, 45nm, 50nm, 85nm, any bandwith client request
• Blocking depth:OD4, OD5, OD6 is availiable
• 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