Translator Disclaimer
24 September 2004 Designing ultra-narrowband interference filters
Author Affiliations +
To understand the factors involved in the cost and risk of manufacture of ultra-narrowband imaging filters in the near IR, we have carried out detailed design work for a range of different filter specifications. This work was essential to the success of the DAZLE near-IR imaging spectrograph, a project led by the Institute of Astronomy at the University of Cambridge. The necessity for very narrow passbands (approximately 1 nm), for observing in the windows between the OH emission lines in the near-IR bands, requires coatings of more than 200 layers and greater than 30 μm thickness. Broadband filters to block OH and thermal emission over wide near-IR spectral ranges (1.4 - 2.8 μm) also require many thin film layers in the filter coatings. In most cases, the large number of layers is the most significant factor in determining manufacturing cost, as such coatings require long periods of time for deposition (days to weeks), with a resultant high risk of failure during manufacture.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sonia Cianci, Joss Bland-Hawthorn, and John O'Byrne "Designing ultra-narrowband interference filters", Proc. SPIE 5494, Optical Fabrication, Metrology, and Material Advancements for Telescopes, (24 September 2004);


Status and performance of HST Wide Field Camera 3
Proceedings of SPIE (October 12 2004)
The PAU camera and the PAU survey at the William...
Proceedings of SPIE (September 24 2012)
Status and performance of HST/wide field camera 3
Proceedings of SPIE (July 06 2006)
Multiband interference filters for differential imaging
Proceedings of SPIE (August 16 2000)

Back to Top