VERSATILE MULTIPLE MODULATION SCHEME FOR TWO-BEAM LASER SPECTROSCOPY
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Date
1985
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Ohio State University
Abstract
Multiple modulation techniques afford shot noise-limited detection sensitivity for two-beam laser spectroscopy. Single side-band (SSB) detection of the sum or difference frequency offers the advantage of response linearity over amplitude modulation (AM) detection, but requires frequency synthesis techniques to ensure phase-locking of the signal carrier frequency to the detector reference frequency. We report here an inexpensive SSB detection scheme which provides continuous tunability of both modulation frequencies (limited only by frequency roll-off in the optical modulators). This enables the use of multiple modulation with lasers (e.g. cavity-dumped systems) whose repetition rates are too low for use with previously reported modulation frequencies.
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Author Institution: Department of Chemistry and Ames Laboratory - USDOE, Iowa State University