Optical Longpass Filter 900nm is designed to effectively transmit near-infrared light while blocking shorter wavelengths. With over 90% transmission and excellent optical clarity, this filter is ideal for applications in spectroscopy, remote sensing, and thermal imaging. Its durable anti-reflective coating enhances performance by minimizing stray light.

Key Features:

• Cut-On Wavelength: 900nm – Allows red and near-infrared light to pass while blocking shorter wavelengths, including most visible light.
• Blocking Range: Effectively blocks wavelengths shorter than 900nm, such as UV and visible light.
• High Transmission: Provides high transmission efficiency for wavelengths in the NIR region, ensuring minimal signal loss.
• Steep Cut-On Edge: Exhibits a sharp transition between blocked and transmitted wavelengths for precise separation between visible and NIR light.

Coligh’s stock standard 800nm longpass filter:

• Type: longpass filter
• Coating: Hard coated
• Angle of incidence: 0°
• Wavelength cut on tolerance :900+/-5
• Blocking depth: >=OD3@400-890nm
• Transmission: >90%@910-1100nm
• 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