Low-loss and single-mode tapered hollow-core waveguides optically coupled with interband and quantum cascade lasers

Marilena Giglio; Pietro Patimisco; Angelo Sampaolo; Jason M. Kriesel; Frank K. Tittel; Vincenzo Spagnolo

doi:10.1117/1.OE.57.1.011004

24 August 2017 Low-loss and single-mode tapered hollow-core waveguides optically coupled with interband and quantum cascade lasers

Marilena Giglio, Pietro Patimisco, Angelo Sampaolo, Jason M. Kriesel, Frank K. Tittel, Vincenzo Spagnolo

Author Affiliations +

Optical Engineering, Vol. 57, Issue 1, 011004 (August 2017). https://doi.org/10.1117/1.OE.57.1.011004

Abstract

We report single-mode midinfrared laser beam delivery through a 50-cm-long tapered hollow-core waveguide (HCW) having bore diameter linearly increasing from 200 to 260 _μm. We performed theoretical calculations to identify the best HCW-laser coupling conditions in terms of optical losses and single-mode fiber output. To validate our modeling, we coupled the HCW with an interband cascade laser and four quantum cascade lasers with their emission wavelengths spanning 3.5 to 7.8 _μm, using focusing lenses with different focal lengths. With the best coupling conditions, we achieved single-mode output in the investigated 3.5 to 7.8 _μm spectral range, with minimum transmission losses of 1.27 dB at 6.2 _μm.

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Marilena Giglio, Pietro Patimisco, Angelo Sampaolo, Jason M. Kriesel, Frank K. Tittel, and Vincenzo Spagnolo "Low-loss and single-mode tapered hollow-core waveguides optically coupled with interband and quantum cascade lasers," Optical Engineering 57(1), 011004 (24 August 2017). https://doi.org/10.1117/1.OE.57.1.011004

Received: 30 May 2017; Accepted: 1 August 2017; Published: 24 August 2017

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