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Optical Engineering • Open Access

Fabrication of low-loss hollow waveguide with multiple dielectric layers for infrared cavity ring-down spectroscopy
Author(s): Ryo Ichikawa; Takashi Katagiri; Yuji Matsuura

Paper 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.

Paper Details

Date Published: 7 October 2013
PDF: 5 pages
Opt. Eng. 52(10) 106104 doi: 10.1117/1.OE.52.10.106104
Published in: Optical Engineering Volume 52, Issue 10
Show Author Affiliations
Ryo Ichikawa, Tohoku Univ. (Japan)
Takashi Katagiri, Tohoku Univ. (Japan)
Yuji Matsuura, Tohoku Univ. (Japan)

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