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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Fundamental-frequency pulse compression through cascaded second-order processes in a type II phase-matched

A Dubietis, G Valiulis, R Danielius

    Optics Letters
    |October 31, 2009
    PubMed
    Summary

    Cascading second-order processes efficiently compress fundamental frequency pulses in type II phase-matched second-harmonic generation. Pulse compression is achievable for any interacting pulse by adjusting pump intensity ratios.

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    Area of Science:

    • Nonlinear Optics
    • Quantum Optics
    • Laser Physics

    Background:

    • Second-harmonic generation (SHG) is a key nonlinear optical process.
    • Group-velocity mismatch (GVM) typically limits pulse compression efficiency.
    • Type II phase-matching offers unique interaction dynamics.

    Purpose of the Study:

    • To investigate pulse compression via cascading second-order processes.
    • To explore the role of group-velocity mismatch in efficient pulse shortening.
    • To demonstrate controllable pulse compression using intensity-balanced pump beams.

    Main Methods:

    • Theoretical analysis of cascading second-order nonlinear processes.
    • Numerical simulations of pulse propagation under large GVM.
    • Experimental implementation using type II phase-matched second-harmonic generation.

    Main Results:

    • Cascading processes enable efficient pulse compression at fundamental frequency.
    • Achieved compression of optical pulses from 1.3 picoseconds to 280 femtoseconds.
    • Demonstrated nearly 50% energy conversion efficiency for compressed pulses.
    • Showed that compression is possible for any of the three interacting pulses by tuning pump intensity ratios.

    Conclusions:

    • Cascading nonlinear optical effects provide a viable route for efficient pulse compression.
    • Type II SHG with large GVM is a promising platform for achieving significant pulse shortening.
    • Controlling pump pulse intensity ratios offers a method for tailoring pulse compression outcomes.