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Steep Blocking Long Pass Interference Filters

The long-pass filter is an essential optical component in the field of optics. The feature is to pass the long-wave light and cut off the short-wave light.

Bodian Co., Ltd. has an experienced R&D team. The long-wave filter has the features of high transmittance, high cut-off depth, steep transition band, short-wave can cut off to 200nm, and good film firmness. The coating products developed and sold have been widely used in research experiments, analytical instruments, fluorescence testing equipment, environmental monitoring equipment, agricultural measuring instruments, biochemical instruments, medical analysis and other fields and industries. We have different kinds of long-pass filters in stock, and the products can be customized according to the customer’s requirements.

Product Detail

Product Tags

Product overview

Long-wave filter is called in the digital photography industry, and its optical characteristics are same, that is, the light in the long-wave direction is highly transmitted, while the light in the relatively short-wave direction is cut off. It belongs to a type of cut-off filter. Of course, the long-wave filter used in optical precision instruments, its cut-off filter. Depth is more demanding than photographic filters, and its quality is higher. The long-wave filter is made of special colored glass, and the dopant in the material absorbs the spectrum of a specific band but transmits the long-wave band. These filters are absorbing filters and are not suitable for use under laser conditions.

Product Specifications

Process: Ion Assisted Dura

Wavelength (nm): LP320, 420, 435, 455, 475, 495, 510, 530, 550, 570, 590, 610,630, 665, 695,etc

Average transmittance: >90%

Steepness: 50%~OD5 < 10nm

Cutoff depth: OD>6

Size(mm): Φ25.4, 70*70

Application areas

Long-pass filters are mainly used in biometric identification, optical fiber lighting, strong light flashlights, medical testing instruments, beauty photonic equipment, multi-band detectors, stage lighting systems, cold light source display cabinets, digital imaging applications and other fields and industries.


IAD Hard Coating


LP320, 420, 435, 455, 475, 495, 510, 530, 550, 570, 590, 610, 630, 665, 695,etc

T avg.



 50%~OD5 < 10nm




Φ25.4,  70*70



Production Proces

Fluorescence  Filters (11)

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