13 February 2016 Hollow-core waveguide for single-mode laser beam propagation in the spectral range of 3.7-7.3 μm
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Abstract
We report the first demonstration of single-mode laser beam delivery in hollow-core waveguides (HCWs) operating in the 3.7-7.3 μm spectral range. We investigated the transmission properties of HCWs with 200 μm bore diameter and internal coatings properly designed to enhance the spectral response in the spectral range of 3-12 μm. We achieved single mode output throughout the 3.7-7.3 μm range. We measured a coupling efficiency < 90% and transmission losses as low as 1 dB, when using a 15 cm-long fiber at 3.7 μm under optimized coupling conditions between input beam and HCW.
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P. Patimisco, L. Mihai, M. Giglio, A. Sampaolo, P. P. Calabrese, J. M. Kriesel, D. Sporea, G. Scamarcio, F. K. Tittel, V. Spagnolo, "Hollow-core waveguide for single-mode laser beam propagation in the spectral range of 3.7-7.3 μm", Proc. SPIE 9755, Quantum Sensing and Nano Electronics and Photonics XIII, 97552M (13 February 2016); doi: 10.1117/12.2209533; https://doi.org/10.1117/12.2209533
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