A 670nm bandpass filter with a Full Width at Half Maximum (FWHM) of 10nm means that the filter allows light to pass through within a narrow range of wavelengths centered around 670nm, and the width of this range is defined at the point where the transmission is half of the maximum value.

FWHM is a measure of the spectral resolution of the filter, indicating how narrow or broad the passband of the filter is. In this case, a FWHM of 10nm suggests that the filter has relatively high spectral resolution, allowing only light within approximately 10nm range around 670nm to pass through effectively.

Bandpass filters are commonly used in various applications including spectroscopy, fluorescence microscopy, and telecommunications, where isolating specific wavelengths of light is necessary.

Coligh’s stock standard 670nm optical bandpass filter FWHM 10nm feature:

• Feature: VIS bandpass filter
• Center wavelength: 670nm±2nm
• Angle of incidence: 0°
• FWHM: 10nm±2nm
• Blocking range: 200-1100nm
• Blocking depth: OD4, OD6 and above
• Transmission average: Above 90%
• Thickness：1.0mm, 1.1mm
• Size: φ8mm, φ10mm, φ12.5mm, φ25.4mm, φ50mm mounted or unmounted
• Material: B270, K9, Fused silica

Custom option:

• Bandwidth: 10nm,18nm, 20nm, 22nm, 30nm, 40nm, 50nm,  or any bandwith client request
• Angle of incidence: Depend on request
• Blocking depth:  OD4, OD5, OD6, OD8
• Bandwidth: Narrow to 1nm
• Size: round or square smaller than 150*150mm
• Material thickness: Depend on request
• Transmission and blocking rang: custom as per requirement or between 200nm to 1500nm

Please contact sales for stock status.