Abstract

Quantum-limited frequency-modulation spectroscopy (FMS) has been performed with tunable diode lasers at 5.4 and 1.3 μm by employing a dual-beam balanced homodyne detection scheme to suppress optical fringes, residual amplitude modulation, and excess laser noise by 15–20 dB. Performing FMS at the two wavelengths involved different lasers (lead salt and InGaAsP, respectively), optics, and detectors, which emphasizes the versatility and applicability of the technique. System sensitivities of 1 × 10−7 and 2 × 10−7 were obtained for the respective systems.

© 1989 Optical Society of America

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