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Enhanced UV third-harmonic generation in microfibers by controlling nonlinear phase modulations.

Xiujuan Jiang, Timothy Lee, Mengmeng Chen

    Optics Letters
    |August 30, 2019
    PubMed
    Summary

    Nonlinear phase modulations enhance third-harmonic (TH) generation in silica microfibers. This method produces narrow-bandwidth ultraviolet TH with high signal-to-noise ratio and optimized harmonic output via phase mismatch control.

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    Area of Science:

    • Nonlinear Optics
    • Materials Science

    Background:

    • Silica microfibers are suitable for nonlinear optical processes.
    • Third-harmonic generation (THG) is a key nonlinear optical phenomenon.
    • Controlling phase mismatch is crucial for efficient THG.

    Purpose of the Study:

    • To experimentally demonstrate the influence of nonlinear phase modulations on THG in silica microfibers.
    • To achieve enhanced narrow-bandwidth ultraviolet TH generation.
    • To optimize THG by controlling phase mismatch.

    Main Methods:

    • Experimental setup utilizing silica microfibers.
    • Application of nonlinear phase modulations.
    • Characterization of TH power against input pump power (up to 2.5 kW).
    • Measurement of signal-to-noise ratio and average power.

    Main Results:

    • Demonstration of nonlinear phase modulation's influence on TH conversion.
    • Generation of enhanced, narrow-bandwidth ultraviolet TH.
    • Achieved high signal-to-noise ratio (33 dB).
    • Obtained average power in the hundreds of nanowatts.
    • Experimental results align with theoretical predictions for TH power trends.

    Conclusions:

    • Nonlinear phase modulations are effective for enhancing TH conversion in silica microfibers.
    • Adaptive control of phase mismatch allows for optimization of harmonic output.
    • The findings pave the way for efficient generation of ultraviolet light sources.