Silver halide single mode fibers for broadband middle infrared stellar interferometry
Abstract
We report the demonstration of silver halide single mode fibers at λ=7.5 μm. The fiber's modal behavior was tested at λ=10.6 and λ=7.5 μm, using near field measurements. Single mode operation was observed for both wavelengths with propagation losses of ~16 and ~40 dB/m at λ=10.6 and λ=7.5 μm, respectively. A rejection ratio of ~30 dB was achieved at λ=7.5 μm for a 30 cm long fiber segment. These fibers would be particularly useful for modal filtering in the 6-20 μm band. Modal filters are essential technology elements in nulling stellar interferometry.
- Publication:
-
Applied Physics Letters
- Pub Date:
- June 2009
- DOI:
- 10.1063/1.3166864
- Bibcode:
- 2009ApPhL..94z1105L
- Keywords:
-
- 95.75.Kk;
- Interferometry