LENSES AND OPTICS
Band pass filter
11 July 2007
Lake Shore Cryotronics
Lake Shore Cryotronics has introduced a new line of band pass and narrow band pass filters available with centre wavelengths from 15 to 200µm. These filters are based on a novel metal mesh technology originally developed in tandem with the Nasa SBIR program to support the needs of the astronomy community.
The filters are designed with patterned, cross-shaped holes that allow transmission of light at specific wavelengths. Centre wavelength (CWL) transmissions of up to 80 per cent have been achieved with a CWL tolerance of ±0.1µm and out-of-band transmission down to 0.5 per cent. The filters exhibit excellent thermal properties with stable and repeatable performance down to 4K. The filters are 1mm in depth, enabling entry into existing filter wheels, cryostats and compact optical instruments.
The band pass filters, along with Lake Shore’s established line of porous silicon-based long wave pass filters, can be used in a variety of applications including space-based astronomy, ground or airborne astronomy, FTIR and THz spectroscopy, among other electro-optics research and testing.
Many standard filters are currently available from stock and continued research and development will further extend the performance capabilities of the technology. Custom designs and sizes are available upon request.