Frequency-modulation spectroscopy with a multimode laser.
We report the demonstration of FM spectroscopy with a multimode cw laser that in most cases preserves the high sensitivity of FM spectroscopy with a single-mode laser without the stringent alignment requirements. Sensitivity to absorptions as small as 10(-4) can be inferred from our measurements, and the restrictions on modulation frequencies for small sample times are explored.
Cooper
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Gallagher
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