A 405nm band pass filter with a 10nm Full Width at Half Maximum (FWHM) indicates that the filter allows light primarily within a narrow wavelength range centered around 405nm (nanometers), and the width of this range at half of the maximum transmission is 10nm.

Bandpass filters are designed to transmit a specific range of wavelengths while blocking others. In this case, the filter would allow light around the 405nm wavelength to pass through effectively while attenuating light outside this range. The 10nm FWHM value indicates the width of the range of wavelengths passed by the filter.

Such filters are commonly used in various applications including fluorescence microscopy, spectroscopy, and laser systems where precise control over the wavelength of light is crucial.

Coligh’s stock standard 450nm optical bandpass filter FWHM 10nm feature:

• Feature: VIS bandpass filter
• Center wavelength: 450nm±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, 20nm, 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