Abstract

We report the laboratory demonstration of two-tone frequency-modulation spectroscopy with a continuous-wave (cw) CO2 laser. Using a resonant-cavity electro-optic phase modulator operating at 1 GHz, we obtained sensitivities to absorptions of 2 × 10−5 in a 1-Hz bandwidth from an étalon resonance and from calibrated mixtures of NH3. This sensitivity was within a factor of 3 of the quantum noise limit for our apparatus and was limited by baseline drift and fluctuations due to residual amplitude modulation and optical fringes.

© 1990 Optical Society of America

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