Single mode operation with mid-IR hollow fibers in the range 5.1-10.5 µm

Abstract

Single mode beam delivery in the mid-infrared spectral range 5.1-10.5 μm employing flexible hollow glass waveguides of 15 cm and 50 cm lengths, with metallic/dielectric internal layers and a bore diameter of 200 μm were demonstrated. Three quantum cascade lasers were coupled with the hollow core fibers. For a fiber length of 15 cm, we measured losses down to 1.55 dB at 5.4 μm and 0.9 dB at 10.5 μm. The influence of the launch conditions in the fiber on the propagation losses and on the beam profile at the waveguide exit was analyzed. At 10.5 µm laser wavelength we found near perfect agreement between measured and theoretical losses, while at ~5 µm and ~6 µm wavelengths the losses were higher than expected. This discrepancy can be explained considering an additional scattering loss effect, which scales as 1/λ2 and is due to surface roughness of the metallic layer used to form the high-reflective internal layer structure of the hollow core waveguide.

Description
Advisor
Degree
Type
Journal article
Keywords
Citation

Sampaolo, Angelo, Patimisco, Pietro, Kriesel, Jason M., et al.. "Single mode operation with mid-IR hollow fibers in the range 5.1-10.5 µm." Optics Express, 23, no. 1 (2015) The Optical Society: 195-204. http://dx.doi.org/10.1364/OE.23.000195.

Has part(s)
Forms part of
Rights
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Link to license
Citable link to this page