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Improved Rubidium Frequency Standard Performance Using Diode Lasers with AM and FM Noise Control

Csaba Székely, Robert E. Drullinger

Published Jan 1, 1992• 1 citation
OpenAlex

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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.
We report on our progress towards the realization of a high-performance laser-pumped rubidium vapour-cell atomic frequency standard for satellite navigation. The conversion process of the laser's FM-AM noise which degrades the SNR of a gas-cell discriminator with87Rb and buffer gases was experimentally studied as a function of laser's intensity and its frequency using the double radio-optical resonance scheme (DROR) operating on two optical transitions: |2>-2P3/2or |1>-2P3/2. The new method is proposed and realized for fine tuning of a laser frequency to the value corresponding to the minimum value of FM-AM conversion noise. While using this method, the RFS breadboard is built.