A 500nm bandpass filter with a Full Width at Half Maximum (FWHM) of 40nm would have its peak transmission centered at 500nm with a width of 40nm.

500nm bandpass filter with a FWHM of 40nm, light within the range of approximately 480nm to 520nm would be transmitted with significant efficiency, while light outside this range would be significantly attenuated.

The precise wavelength selection provided by a bandpass filter with a narrow FWHM like 40nm can significantly enhance the performance and accuracy of various optical systems and instruments across a wide range of applications. It can be widely used in:

• Photolithography
• Fluorescence Microscopy
• Spectroscopy
• Environmental Monitoring
• Optical Communication

Coligh’s stock standard 500nm optical bandpass filter FWHM 40nm feature:

• Feature: VIS bandpass filter
• Center wavelength: 500nm±5nm
• Angle of incidence: 0°
• FWHM: 40nm±5nm
• Blocking range: 200-1100nm
• Blocking depth: OD4, OD6 and above
• Transmission average: Above 90%
• Thickness：1.0mm, 1.1mm
• Size: φ12.5mm, φ25.4mm, φ50mm mounted or unmounted
• Material: B270, K9, Fused silica
• Other stock bandwidth for reference: 10nm, 20nm

Custom option:

• Bandwidth: 30nm, 50nm,  or any bandwith client request
• Angle of incidence: Depend on request
• Blocking depth:  OD5, OD6, OD8
• 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