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Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

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Published on: June 8, 2018

Coherent phenomena between incoherent pulses.

L R Marshall, J A Piper

    Optics Letters
    |September 25, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Two temporally separated laser pulses interact coherently, boosting stimulated Raman scattering (SRS) conversion efficiency. This enhancement, up to 27%, is driven by long-lived coherence within the Raman medium.

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    Area of Science:

    • Nonlinear Optics
    • Quantum Coherence

    Background:

    • Stimulated Raman scattering (SRS) is a key nonlinear optical process.
    • Efficient SRS conversion is crucial for applications like frequency conversion and spectroscopy.
    • Controlling SRS efficiency using tailored pulse sequences remains an active research area.

    Purpose of the Study:

    • To investigate the coherent interaction between temporally separated pulses.
    • To enhance stimulated Raman scattering conversion efficiency.
    • To understand the role of long-lived coherence in this enhancement.

    Main Methods:

    • Experimental setup involving two incoherent, temporally separated laser pulses.
    • Measurement of stimulated Raman scattering conversion efficiency.
    • Systematic variation of temporal pulse spacing.

    Main Results:

    • Observed a significant increase in SRS conversion efficiency for the delayed pulse.
    • Achieved conversion efficiency enhancement from 14% to 27%.
    • Demonstrated that the coupling mechanism involves long-lived coherence in the Raman medium.

    Conclusions:

    • Coherent interaction between temporally separated pulses can dramatically enhance SRS.
    • Long-lived coherence in the Raman medium is the underlying mechanism for this enhancement.
    • Temporal pulse spacing is a critical parameter influencing the SRS enhancement.