laser heterodyne spectroscopy

laser heterodyne spectroscopy

[′lā·zər ¦hed·ə·rə‚dīn spek′träs·kə·pē]
(spectroscopy)
A high-resolution spectroscopic technique, used in astronomical and atmospheric observations, in which the signal to be measured is mixed with a laser signal in a solid-state diode, producing a difference-frequency signal in the radio-frequency range.
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