Longwave Pass Filters: Infrared

Infrared Longwave Pass (IR LWP) Filters transmit wavelengths longer than their specified 5% cut-on wavelength and block shorter wavelengths. Stock filters are optimized for collimated input at normal incidence and ambient temperature (0° AOI, f/inf, 298K). Cut-on slope for standard products is <=5% and out-of-band (OOB) transmission levels are <=0.1% average and <=1% maximum in the cited blocking range. Custom IR longwave pass filters can be designed, manufactured, and verified to meet almost any spectral and/or system operating requirement.

To assist you in choosing your infrared longwave pass (IR LWP) filter, visit our product selector to choose a LWP filter based on your desired thickness, blocking, and other qualities.  If you still don’t find what you’re looking for then let us create it for you, we offer custom solutions for your unique applications. Contact us by phone or email if you have questions.  Request a quote for your specific needs and one of our optical engineers will assist you with your optical application.

Reynard Corporation standard parameters apply:

Thickness: 1.0 to 2.3mm

Surface Quality: F-F per MIL-F-48616

Flatness: < 3 Lambda @ 632.8nm

Spectral Tolerance: ±2%

Parallelism: < 3 Arc Minutes

Size: 25mm diameter

Cut-on wavelength defined at 5% of maximum transmittance