Optical heterodyne detection for cavity ring-down spectroscopy

Details Optical heterodyne detection for cavity ring-down spectroscopy Optical heterodyne detection for cavity ring-down spectroscopy

1999-04-21

2000-07-25

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356349, G01B 902

Patent

active

060942673

ABSTRACT:
A cavity ring-down system for performing cavity ring-down spectroscopy (CRDS) using optical heterodyne detection of a ring-down wave E.sub.RD during a ring-down phase or a ring-up wave E.sub.RU during a ring up phase. The system sends a local oscillator wave E.sub.LO and a signal wave E.sub.SIGNAL to the cavity, preferably a ring resonator, and derives an interference signal from the combined local oscillator wave E.sub.LO and the ring-down wave E.sub.RD (or ring-up wave E.sub.RU). The local oscillator wave E.sub.LO has a first polarization and the ring-down wave E.sub.RD has a second polarization different from the first polarization. The system has a combining arrangement for combining or overlapping local oscillator wave E.sub.LO and the ring-down wave E.sub.RD at a photodetector, which receives the interference signal and generates a heterodyne current I.sub.H therefrom. Frequency and phase differences between the waves are adjustable.

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