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How to Cool Light Detectors and Light Sources Simultaneously

Volume 32, Number 2 (April 1978) Page 243-245

Müller, G.; Grethen, H.; Winkler, R.

In the field of low level light detection, especially in hyperfine structure investigations, there are two main cooling problems: the cooling of the light source (usually a hollow cathode lamp (HCL)) in order to reduce the Doppler width, and the cooling of the light detector (e.g., a photomultiplier (PM)) to reduce thermal noise, especially the dark-current.