Near-infrared thermally detected absorption spectroscopy and photoacoustics in III-V materials at liquid helium temperatures
- 14 March 1988
- journal article
- Published by IOP Publishing in Journal of Physics D: Applied Physics
- Vol. 21 (3) , 478-482
- https://doi.org/10.1088/0022-3727/21/3/017
Abstract
A spectrometer with different cells for photo-acoustic or thermal detection of optical absorption at liquid helium temperature is described. Three types of detectors can be used: a microphone a carbon-glass thermometer or the (semiconducting) sample itself. The first tests are made in the near-infrared range on III-V materials doped with chromium (GaP) and vanadium (GaAs, GaP and InP). They demonstrate the high sensitivity of the thermometer.Keywords
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