Fabrication of low-loss hollow waveguide with multiple dielectric layers for infrared cavity ring-down spectroscopy

Ryo Ichikawa; Takashi Katagiri; Yuji Matsuura

doi:10.1117/1.OE.52.10.106104

7 October 2013 Fabrication of low-loss hollow waveguide with multiple dielectric layers for infrared cavity ring-down spectroscopy

Ryo Ichikawa, Takashi Katagiri, Yuji Matsuura

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Optical Engineering, Vol. 52, Issue 10, 106104 (October 2013). https://doi.org/10.1117/1.OE.52.10.106104

Abstract

Low-loss hollow waveguides with a multiple dielectric layer are designed and fabricated for use in cavity ring-down spectroscopy (CRDS). Calculations of the waveguide design revealed that hollow waveguides for infrared CRDS system need to have transmission loss of 0.1 dB/m or less. We fabricated rectangular hollow waveguides with multiple dielectric layers to obtain low-loss properties. The waveguides are composed of four glass strips each with a dielectric multilayer deposited on the surface in advance. Experimental results show that the waveguides with double dielectric layers have lower losses at a target wavelength in the infrared than those with a single dielectric layer. The measured transmission loss of a 10-cm long waveguide deposited with a multilayer of Si/Al₂O₃ /Ag for the transverse magnetic wave and Al₂O₃ /Ag for the transverse electric wave was 0.24 dB at a target wavelength of 5.2 μm. The loss of the waveguide will be reduced when only the lowest-order mode is excited in the waveguide.

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Ryo Ichikawa, Takashi Katagiri, and Yuji Matsuura "Fabrication of low-loss hollow waveguide with multiple dielectric layers for infrared cavity ring-down spectroscopy," Optical Engineering 52(10), 106104 (7 October 2013). https://doi.org/10.1117/1.OE.52.10.106104

Published: 7 October 2013

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