Abstract
The high resolution THz gas spectrometer consists of a synthesizer based on Gunn generator with a semiconductor superlattice frequency multiplier as a radiation source, and an NbN hot electron bolometer in a direct detection mode as a THz radiation receiver was presented. The possibility of application of a quantum cascade laser as a local oscillator for a heterodyne receiver which is based on an NbN hot electron bolometer mixer is shown. The ways for further developing of the THz spectroscopy were outlined.
Highlights
The test measurements of the water and deuterium water vapor spectral absorption lines with the spectrometer were performed at 1456–1495 GHz, 1680–1725 GHz and 1904–1955 GHz frequency bands
The quantum cascade laser (QCL) structure was soldered to copper plate holder, which was attached to a cold plate of a closed cycle cryostat
The QCL radiation was collimated with external optics and its radiation power was reflected by abeam splitter (3% reflectance) into a THz transparent optical window of a
Summary
The test measurements of the water and deuterium water vapor spectral absorption lines with the spectrometer were performed at 1456–1495 GHz, 1680–1725 GHz and 1904–1955 GHz frequency bands. One of the absorption line spectra is presented at Fig. 1. A THz quantum cascade laser (QCL) [6] is prospective source of coherent radiation in the THz range. Phase locking (PLL) is needed for practical implementation of QCL in high resolution spectroscopy.
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