Description
Long-Pass Filters – Selective Wavelength Transmission for Optical Sensing Detailed
Description:
Long-Pass Filters are designed to transmit wavelengths longer than a specified cutoff wavelength while blocking shorter wavelengths. They are constructed using thin-film interference coatings or colored glass bulk absorption, offering high transmittance in the passband and strong blocking in the stopband. These filters are ideal for applications requiring isolation of longer wavelengths from shorter, unwanted light.
Key Specifications:
Materials: Optical Glass (colored glass or coated substrate), Fused Silica (UV applications)
Cutoff Wavelength: Customizable (300nm – 1500nm)
Passband Transmittance: >85% (typical)
Stopband Optical Density: OD 3 – OD 6 (customizable)
Size: 5mm × 5mm – 150mm × 150mm
Surface Quality: 60/40, 40/20
Coating: Hard dielectric coating (durability, low scatter)
Applications:
Fluorescence microscopy, Raman spectroscopy, environmental sensing, medical diagnostics, laser safety, machine vision.
