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/Al 2 O 3 /Ag for the transverse magnetic wave and Al 2 O 3 /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.
Low-loss hollow waveguides with multiple dielectric layer are designed and fabricated for use in cavity ring-down
spectroscopy. The waveguides are composed of four glass strips with dielectric multilayer that are 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.
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