Pptical longpass filter at 850nm allows wavelengths longer than 850nm to pass through while blocking shorter wavelengths. It’s commonly used in applications like near-infrared imaging, spectroscopy, and fiber optics to enhance signal clarity and reduce background noise. This filter ultimately aids in capturing clearer images or data by selectively transmitting desired wavelengths.

Key Features: Optical Longpass Filter 850nm

• Cut-On Wavelength: 850 nm – Allows near-infrared light to pass while effectively blocking shorter wavelengths, including most visible light.
• Blocking Range: Effectively blocks wavelengths shorter than 850 nm, such as UV and visible light.
• High Transmission: Provides high transmission efficiency for wavelengths in the near-infrared region, ensuring minimal signal loss.
• Steep Cut-On Edge: Exhibits a sharp transition between blocked and transmitted wavelengths, allowing for precise separation between visible and near-infrared light.
• Durability: Constructed from robust optical materials for long-lasting performance in various environments.

Coligh’s stock standard 850nm longpass filter:

• Type: longpass filter
• Coating: Hard coated
• Angle of incidence: 0°
• Wavelength cut on 50% :850+/-5
• Blocking depth: >=OD3@200-842nm
• Transmission: >90%@870nm-1100nm
• Thickness: 1.0mm, 1.1mm, 0.5mm, 0.7mm
• Surface quality: 80/50, 60/40
• Size: smaller than 100*100mm

Custom option:

• Cut on and cut off wavelength: custom
• Working wavelength: according to client’s request
• Material and thickness: according to client’s request
• Surface quality: 40/20 is in option
• Size: Any size round or square smaller than 100*100mm