Andover Corporation Steep Edge Longpass Filters are engineered for applications where conventional edge filters cannot deliver the required spectral separation.
Research-Grade Edge Performance:
Unlike standard longpass filters that require 15–30 nm to transition from blocking to transmission, our Steep Edge filters achieve the sharpest possible transition in ≤1% of the cut-on wavelength (typically 3–5 nm).
Cut-On Slope: ≤1%
Deep Blocking: ≥OD 6.0 stopband rejection
High Transmission: ≥91% average passband
Cut-On Tolerance: ±1% wavelength control
Operating Range: −50°C to +200°C
Built for Stability and Reliability
Magnetron sputtered hard oxide coatings on precision polished UV Grade Fused Silica deliver exceptional environmental durability and spectral stability, without the drift associated with soft-coated or absorbing glass filters. The result is consistent performance, superior wavefront quality, and long-term reliability.
Ideal For:
Raman spectroscopy, fluorescence microscopy, flow cytometry, LiDAR and remote sensing, and laser line cleanup, any application requiring aggressive spectral separation and maximum signal detection.
Flexible Configuration Options:
Available unmounted or mounted, with custom dimensions, multiple wavelength options (325 nm to NIR), and post-production machining capabilities.
Don't let gradual filter transitions compromise valuable spectral data. Discover our Steep Edge Longpass filter options and capabilities or contact us directly for a custom quote.
Contact Monique to learn more !
