OG550 Absorptive Longpass Filter, 50.0 × 50.0 mm, 515 nm, OD>5.0

Overview

Absorptive longpass filters transmit wavelengths longer than a defined cut-on while blocking shorter spectral components — ideal for removing excitation light, suppressing scattered background, and separating spectral bands. With high transmission and strong out-of-band blocking, they maintain stable spectral performance across a range of incidence conditions, making them well suited to fluorescence detection, Raman spectroscopy, infrared optics, and laser systems.

Applications

• Fluorescence & Raman spectroscopy
• Laser-line / excitation rejection
• Spectral band isolation
• Imaging & laser systems

Construction & Performance

• Substrate: OG550
• Coating: Uncoated (absorptive longpass)
• Dimensions: 50.0 × 50.0 mm
• Thickness: 2.0 mm
• Start wavelength: 515 nm
• OD: >5.0
• Transmission: 90%
• Blocking range: 200–520 nm
• Passband: 610–2500 nm
• Clear aperture: >90%
• Parallelism: 5 arcmin
• Surface quality: 80-50
• Surface flatness: <2 λ @ 633 nm

Storage & Handling

For optimal performance, store and use at 25 °C and 40–60% relative humidity. If the surface becomes contaminated, clean gently with ≥99% alcohol and lint-free lens tissue; never use coarse cloth, water, or abrasive cleaners, which may damage the optic.