Determination of radio-frequency phase in harmonic frequency modulation spectroscopy

Chi Man Shum, Edward A. Whittaker

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We have devised two useful schemes to determine the rf phase of the modulation waveforms in harmonic FM spectroscopy, a novel technique that we reported recently for the removal of residual amplitude modulation.The first method is based on the study of the signal line shapes as a function of the relative rf phase of the twomodulating signals. By comparing the experimental results with the theoretical ones, the rf phase can beaccurately inferred. The second method requires an analysis of the laser FM sideband spectrum. Since thetwo harmonic rf waveforms are coherently generated and applied simultaneously to the modulator, thefrequency-modulated sideband spectrum should show an interference pattern that reveals the rf phaserelationship. With the rf phase information available, a suitable feedback control may then be easilyincorporated into the spectroscopic detection system.

Original languageEnglish
Pages (from-to)3799-3804
Number of pages6
JournalApplied Optics
Volume30
Issue number27
DOIs
StatePublished - 20 Sep 1991

Fingerprint

Dive into the research topics of 'Determination of radio-frequency phase in harmonic frequency modulation spectroscopy'. Together they form a unique fingerprint.

Cite this