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Optics Communications

Spectroscopy with diode-laser noise

M. Rosenbluh, Avia Rosenhouse‐Dantsker, A. D. Wilson‐Gordon, M. D. Levenson, R. Walser

Published Jan 1, 1998• 13 citations
Publisher
DOI
10.1016/s0030-4018(97)00485-9

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We have developed a frequency-modulated, tunable, amplitude-squeezed, diode-laser-based source and used it to perform FM spectroscopy on rubidium. The setup consists of a free-running diode laser injection locked by a frequency-stabilized, current-modulated diode laser. The injection-locked slave laser beam adopted the frequency spectrum of the master laser beam while rejecting residual AM in the master laser beam by more than 50 dB. Injection locking also enhanced amplitude squeezing in the slave laser beam by suppressing uncorrelated longitudinal sidemodes. The noise floor of the measurement was 0.8 dB below the shot-noise level.

Optics Letters•Apr 1, 1997•49 citations
Summary form only given. Efficient conversion of laser frequency noise to amplitude noise takes place when a laser propagates through a resonant medium. This is demonstrated in the case of a solitary diode laser having the usual frequency or phase noise with a bandwidth of /spl sim/30 MHz but very low amplitude noise, propagating through a Doppler-broadened K vapor cell. The lineshape of the noise as a function of laser frequency near the K resonance has the characteristic M shape of FM spectroscopy. Measurements of the RF noise spectrum of the emergent beam in the case where the diode laser is near the 770 nm resonance of K reveals the ground state hyperfine structure of the K atoms at 460 MHz.
We have developed a sub-shot-noise diode laser system and used it to perform sub-shot-noise FM spectroscopy. By inducing FM sidebands on a direct-current modulated external-cavity diode laser and injection locking a slave laser, we have suppressed the residual AM in the master by 50 dB and achieved a noise level of 0.8 dB below the shot-noise level. We expect that such techniques will provide useful and practical tools for future precision measurements and novel atom-photon interaction experiments.
We have developed a frequency-modulated, tunable, amplitude-squeezed, diode-laser-based source and used it to perform FM spectroscopy on rubidium. The setup consists of a free-running diode laser injection locked by a frequency-stabilized, current-modulated diode laser. The injection-locked slave laser beam adopted the frequency spectrum of the master laser beam while rejecting residual AM in the master laser beam by more than 50 dB. Injection locking also enhanced amplitude squeezing in the slave laser beam by suppressing uncorrelated longitudinal sidemodes. The noise floor of the measurement was 0.8 dB below the shot-noise level.