Gleb M. Katyba, Vladimir N. Kurlov, Kirill I. Zaytsev,
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11065/2526292/High-temperature-terahertz-intrawaveguide-spectroscopy-using-hollow-core-sapphire-photonic/10.1117/12.2526292.short
An ability to use sapphire hollow-core terahertz
(THz) waveguides for high-temperature intrawaveguide spectroscopy was studied
experimentally. We assembled an experimental setup, which employs the
principles of THz intrawaveguide spectroscopy and uses a backward wave
oscillator, as a continuous-wave THz source with tunable output frequency, and
a Golay cell, as a detector of THz wave intensity. In this setup, the sapphire
shaped crystal serves simultaneously as an optical waveguide and as a sample
cuvette; the analyte is placed in its central hollow channel. We applied the
setup for high-temperature measurements of sodium nitrite (NaNO2) powder. The observed results demonstrate an
ability to sense melting of NaNO2-powder; justifying a
prospect of sapphire waveguides in THz measurements in harsh environments, at
high temperatures and pressures.
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