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High-sensitivity FM spectroscopy with a lead-salt diode laser

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Abstract

We report the demonstration of near-quantum-noise-limited sensitivity with a lead-salt diode laser using FM spectroscopy and high-speed sweep integration. Using both single-tone and two-tone techniques, we demonstrated an absorption sensitivity of ~2 × 10−7 in a 2.44-Hz bandwidth from a Doppler-broadened NO line at 1856.5 cm−1. The sensitivity in our experiments was limited by laser excess noise, which was about four times the expected quantum-noise level.

© 1988 Optical Society of America

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