Coligh’s Standard 835nm Optical Longpass Filter

The 835nm optical longpass filter is specifically designed to transmit near-infrared (NIR) light above 835nm while effectively blocking shorter wavelengths. With its durable hard-coated design and high-performance optical properties, this filter is ideal for applications requiring precise wavelength selection in the NIR spectrum.

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Standard Specifications:

• Type: NIR Longpass Filter, Interference Filter
• Coating Type: Hard-coated for enhanced durability and stability
• Cut-on Wavelength (CWL): 835nm ± 5nm
• Angle of Incidence: 0° ± 5°
• Blocking Range: 200nm – 825nm
• Blocking Depth: OD2-OD3 or higher for strong suppression of shorter wavelengths
• Transmission Range: > 95% above 835nm~1700nm
• Thickness: 1.0mm, 1.1mm
• Sizes Available: φ12.5mm, φ25.4mm, φ50mm, square formats, or custom sizes upon request
• Clear Aperture: > 90%
• Material: B270, Fused Silica for high optical quality and low absorption

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Custom Options:

• Cut-on Wavelength: Adjustable to meet specific application needs.
• Angle of Incidence: Configurable for non-perpendicular light paths.
• Blocking Depth: Customizable OD levels (e.g., OD3, OD4, OD5, OD6).
• Sizes: Round or square formats up to 150mm x 150mm.
• Material Thickness: Customizable to suit different system requirements.
• Transmission & Blocking Range: Configurable between 200nm – 2000nm based on user needs.

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Applications:

• Infrared Imaging: Enhances sensitivity by isolating wavelengths in the NIR spectrum.
• Spectroscopy: Enables precise analysis with effective wavelength separation.
• Laser Systems: Optimized for isolating specific IR laser wavelengths.
• Optical Communication: Ensures wavelength-specific filtering in NIR systems.
• Machine Vision: Improves IR sensitivity in industrial inspection systems.
• Astronomy and Remote Sensing: Captures NIR light for celestial and environmental studies.
• Biomedical Imaging: Supports IR-based imaging for diagnostics and research.