We demonstrated low-loss and single-mode laser beam delivery through hollow-core waveguides (HCWs) operating in the 3.7-7.6 μm spectral range. The employed HCWs have a circular cross section with a bore diameter of 200 μm and metallic/dielectric internal coatings deposited inside a glass capillary tube. The internal coatings have been produced to enhance the spectral response of the HCWs in the range 3.5-12 μm. We demonstrated Gaussian-like outputs throughout the 4.5-7.6 μm spectral range. A quasi single-mode output beam with only small beam distortions was achieved when the wavelength was reduced to 3.7 μm. With a 15-cm-long HCW and optimized coupling conditions, we measured coupling efficiencies of >88% and transmission losses of <1 dB in the investigated infrared spectral range.

Low-loss coupling of quantum cascade lasers into hollow-core waveguides with single-mode output in the 3.7-7.6 μm spectral range

PATIMISCO, PIETRO;SAMPAOLO, ANGELO;GIGLIO, MARILENA;SCAMARCIO, Gaetano;SPAGNOLO, VINCENZO LUIGI
2016-01-01

Abstract

We demonstrated low-loss and single-mode laser beam delivery through hollow-core waveguides (HCWs) operating in the 3.7-7.6 μm spectral range. The employed HCWs have a circular cross section with a bore diameter of 200 μm and metallic/dielectric internal coatings deposited inside a glass capillary tube. The internal coatings have been produced to enhance the spectral response of the HCWs in the range 3.5-12 μm. We demonstrated Gaussian-like outputs throughout the 4.5-7.6 μm spectral range. A quasi single-mode output beam with only small beam distortions was achieved when the wavelength was reduced to 3.7 μm. With a 15-cm-long HCW and optimized coupling conditions, we measured coupling efficiencies of >88% and transmission losses of <1 dB in the investigated infrared spectral range.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/187225
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