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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Microwave signal generation with optical injection locking.

P Bouyer, T L Gustavson, K G Haritos

    Optics Letters
    |November 3, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates a novel method for generating ultra-narrow linewidth microwave signals using injection-locked laser diodes and an acousto-optic modulator. This technique enables precise characterization of atomic transitions and microwave phase noise.

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    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Quantum Optics
    • Metrology

    Background:

    • Precise generation and control of microwave signals are crucial for atomic clocks and quantum information processing.
    • Injection locking of lasers offers a method for stabilizing laser frequency and phase.
    • Acousto-optic modulators can imprint microwave frequencies onto optical signals.

    Purpose of the Study:

    • To develop a system for generating ultra-narrow linewidth microwave signals.
    • To utilize these signals for high-precision atomic spectroscopy.
    • To characterize microwave signal phase noise using atomic Ramsey interferometry.

    Main Methods:

    • Injection locking two single-mode laser diodes to diffracted orders of a 4.6-GHz acousto-optic modulator.
    • Measuring the locking bandwidth and gain of the laser diodes.
    • Driving stimulated Raman transitions between cesium ground-state hyperfine levels.
    • Observing Ramsey fringes to analyze microwave signal properties.

    Main Results:

    • Achieved a locking bandwidth of 3 GHz with a locking gain of 35 dB.
    • Generated a 9.2 GHz microwave signal with a linewidth of less than a few hertz.
    • Successfully observed Ramsey fringes in cesium hyperfine transitions.
    • Characterized microwave signal phase noise using the observed Ramsey fringes.

    Conclusions:

    • The developed system provides a robust method for generating high-quality microwave signals.
    • Injection locking laser diodes to acousto-optic modulators is effective for microwave generation.
    • Ramsey fringe spectroscopy is a valuable tool for characterizing microwave phase noise.