Answers are grounded in this paper and cite their sources.
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.
No takes yet. Share an insight, caveat, or question.
Nakib et al. (1988) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: