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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Published on: May 30, 2014

Squeezed light from second-harmonic generation: experiment versus theory.

T C Ralph, M S Taubman, A G White

    Optics Letters
    |October 28, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We observed excellent agreement between theoretical predictions and experimental results for squeezing in a nonlinear optical crystal. Our study also modeled and confirmed limitations in noise suppression from the pump laser.

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    Area of Science:

    • Quantum optics
    • Nonlinear optics
    • Laser physics

    Background:

    • Squeezed states of light are crucial for precision measurements beyond the standard quantum limit.
    • Second-harmonic generation (SHG) is a key nonlinear optical process for generating light at shorter wavelengths.
    • Understanding noise sources in squeezed light generation is essential for practical applications.

    Purpose of the Study:

    • To quantitatively compare theoretical predictions with experimental observations of squeezed light generation via singly resonant second-harmonic generation (SR-SHG).
    • To investigate and validate the impact of pump laser noise on the achievable noise suppression in SR-SHG.

    Main Methods:

    • Utilized a singly resonant optical cavity for second-harmonic generation.
    • Employed theoretical modeling to predict squeezing levels and noise characteristics.
    • Performed experimental measurements of optical squeezing and pump laser noise.

    Main Results:

    • Demonstrated excellent quantitative agreement between theoretical predictions and experimental measurements of squeezing.
    • Explicitly modeled the limitations imposed by pump laser noise on squeezing.
    • Experimentally confirmed that pump laser noise limits the noise suppression achieved in the generated squeezed light.

    Conclusions:

    • Singly resonant second-harmonic generation is a viable method for generating squeezed light with high fidelity.
    • Pump laser noise is a significant factor limiting the performance of squeezed light sources based on SR-SHG.
    • Further improvements in pump laser quality are necessary to fully realize the potential of SR-SHG for quantum technologies.