Silver halide single mode fibers for broadband middle infrared stellar interferometry

Lewi, T.; Tsun, A.; Katzir, A.; Kaster, J.; Fuchs, F.
June 2009
Applied Physics Letters;6/29/2009, Vol. 94 Issue 26, p261105
Academic Journal
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.


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