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Instant and efficient second-harmonic generation and downconversion in unprepared graded-index multimode fibers.

M A Eftekhar, Z Sanjabi-Eznaveh, J E Antonio-Lopez

    Optics Letters
    |September 29, 2017
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    Summary

    Germanium-doped multimode silica fibers achieve high, instantaneous second-harmonic generation efficiencies (∼6.5%) for frequency doubling. This rapid nonlinear optical process also shows effective downconversion without lengthy fiber preparation.

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    Area of Science:

    • Nonlinear Optics
    • Materials Science
    • Optical Fibers

    Background:

    • Second-harmonic generation (SHG) is a key nonlinear optical process.
    • Previous SHG experiments in optical fibers required extensive preparation.
    • Developing efficient, instantaneous nonlinear processes in fibers is desirable.

    Purpose of the Study:

    • To investigate SHG and downconversion in germanium-doped graded-index multimode silica fibers.
    • To determine conversion efficiencies and temporal characteristics of these nonlinear processes.
    • To assess the feasibility of using unprepared fibers for rapid nonlinear frequency conversion.

    Main Methods:

    • Excitation of germanium-doped graded-index multimode silica fibers at 1064 nm.
    • Measurement of second-harmonic generation conversion efficiencies.
    • Observation of accompanying downconversion phenomena.
    • Assessment of the temporal dynamics of the nonlinear processes.

    Main Results:

    • Achieved relatively high SHG conversion efficiencies of approximately 6.5%.
    • Observed instantaneous frequency-doubling behavior.
    • Demonstrated effective downconversion alongside SHG.
    • Reported among the highest efficiencies in unprepared fibers, requiring no lengthy preparation.

    Conclusions:

    • Germanium-doped graded-index multimode silica fibers offer efficient and instantaneous nonlinear frequency conversion.
    • These fibers present a significant advancement over traditional methods requiring hours of preparation.
    • The observed high efficiencies and rapid response make these fibers promising for practical nonlinear optical applications.