Coligh’s Standard 855nm Optical Bandpass Filter (FWHM 25nm)

The 855nm optical bandpass filter is designed to transmit light centered at 855nm with a Full Width at Half Maximum (FWHM) of 25nm, ensuring precise selection of near-infrared (NIR) wavelengths. This filter is ideal for applications in NIR imaging, sensing, and laser-based systems, providing excellent transmission and blocking performance.

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Standard Specifications:

• Type: NIR Bandpass Filter, Interference Filter
• Coating Type: Hard-coated for enhanced durability and environmental resistance
• Center Wavelength (CWL): 855nm ± 3nm
• Angle of Incidence: 0° ± 5°
• FWHM: 25nm ± 3nm
• Blocking Range: 200nm – 1150nm
• Blocking Depth: OD4
• Peak Transmission: >85%
• Thickness: 0.2mm, 0.3mm, 0.5mm, 0.55mm, 0.7mm, 1.0mm, 1.1mm
• Sizes Available: φ12.5mm, φ25.4mm, φ50mm, or custom sizes upon request
• Clear Aperture: > 90%
• Material: float glass, D263T, B270, Color glass

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Custom Options:

• Bandwidth: Customizable to 10nm, 20nm, 30nm,40nm,45nm,50nm,55nm,60nm, or as required
• Angle of Incidence: Tunable for non-perpendicular light paths
• Blocking Depth: Custom OD levels (e.g., OD3, OD4, OD5, OD6)
• Sizes: Round or square formats up to 150mm x 150mm
• Material Thickness: Adjustable for specific system needs
• Transmission & Blocking Range: Tailored between 200nm – 2000nm

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Applications:

• NIR Imaging: Enhances image quality by isolating near-infrared wavelengths.
• Laser-Based Systems: Isolates 855nm laser lines for precision applications.
• Remote Sensing: Facilitates accurate data capture for environmental and industrial monitoring.
• Spectroscopy: Ensures reliable measurements of specific NIR spectral ranges.
• Optical Communication: Optimized for NIR signal filtering in fiber-optic systems.
• Machine Vision: Enhances detection accuracy in automated inspection systems.