Filters

We provide a variety of cutting-edge optical thin film filters and absorptive filters.

Lyot filters and Solc filters made form Birefringent Filter Plates offer an extremely narrow bandwidth with wide angular fields or tuning capability.

Telcom filters include gain flattening filters, DWDM filters, long and short pass filters for telecommunication applications.

Laser line interference filters center on the resonance of the laser and attenuate the background optical radiation.

Single cavity (SC) filters are a special type of solid etalon in which the cavity is formed by a deposited layer of coating material on a glass substrate. It has up to 100nm tuning range and great thermal stability.

Neutral density filters uniformly attenuates optical radiation in specific spectral regions. In contrast with neutral density filters, color glass filters selectively transmit a desired wavelength range.

The infrared filters are widely used in gas monitoring, temperature sensing and thermal imaging.  The infrared cut-off filters are used for CCD or CMOS imagers to produce vivid images.

Filters	Materials	Pictures	Applications and Features
Birefringent Filter Plates	Crystal Quartz		Lyot Filters  Solc Filters
Telecom Filters	Substrate BK7		Low insertion loss and ripples high isolation Excellent thermal stability
Laser Line Filters	Substrate BK7		Biotech and biomedical applications Spectral separation of different elements. Instrumentation for environmental testing, clinical chemistry
Single Cavity Filters	Substrate BK7		Up to 100nm tuning range High thermal  stability
Neutral Density Filters	Optical Neutral Density Glass BK7 with Metallic coating		Imaging application Exhibit nearly constant transmission
Color Glass Filter	Color Glass		selectively transmit a desired wavelength range
Infrared Filters	Substrate BK7, Silicon or Germanium		Gas Monitoring Temperature Sensing  Thermal Imaging
Infrared Cut-off Filters	Substrate D263T		CCD or CMOS imagers