Frequency-switched heterodyne cavity ringdown spectroscopy.
When the frequency of light coupled into a cavity is suddenly shifted, the radiation emanating from the input port of the previously excited cavity can beat with the reflection of the frequency-shifted input on the surface of a photodetector. When the beat frequency is stable, the time decay of the resulting optical heterodyne signal can be used to measure intracavity absorption spectra with near quantum-limited sensitivity.
Levenson
M D
MD
Paldus
B A
BA
Spence
T G
TG
Harb
C C
CC
Zare
R N
RN
Lawrence
M J
MJ
Byer
R L
RL