Longpass filters transmit longer wavelengths beyond a designated cutoff while reflecting the shorter ones below it. They are often used to block harmful ultraviolet (UV) radiation, and they can be paired with shortpass filters to build a custom bandpass window. They are part of our wider range of optical bandpass filters, engineered for precise control over which wavelengths reach your sensor.
Longpass Filter Features and Applications
Longpass filters from JNS provide a clean transition from reflection to transmission. Each filter is double-side polished for optical flatness and a 40/20 scratch-dig surface quality, with AR coatings for maximum transmission and optional oleophobic coatings for scratch resistance and easier cleaning.
We offer a wide range of cutoff wavelengths and customization options, along with threaded, C-Mount, slip, and custom mounts. These filters are used across many sectors, from industrial cameras and LCD covers to autonomous vehicles and thermal systems. Common applications include protective windows for cameras, sensors, and optics exposed to harsh conditions, fluorescence emission filtering and spectroscopy, laser light control and thermal management, and multispectral and hyperspectral imaging systems.
Why Engineers Choose JNS for Longpass Filters
JNS combines in-house glass processing with advanced coating capabilities, so we control the part from raw substrate to finished filter. We supply OEMs, integrators, and research teams across defense, life sciences, industrial inspection, and consumer optics, and we can move from prototype samples to production volume on the timelines those programs run on. If your design calls for a specific cutoff wavelength, a particular mount, or a custom size that no catalog part covers, send us the spec and we will build to it.