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In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
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Published on: May 27, 2013

Experimental study on seed light source coherence dependence of continuous-wave supercontinuum performance.

Ju Han Lee, Young-Geun Han, Sang Lee

    Optics Express
    |June 12, 2009
    PubMed
    Summary

    Amplified spontaneous emission (ASE) driven supercontinuums (SCs) show superior spectral smoothness and output power compared to laser-driven SCs. Both methods exhibit high relative-intensity-noise due to quantum fluctuations.

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    Area of Science:

    • Nonlinear Optics
    • Quantum Optics
    • Laser Physics

    Background:

    • Supercontinuum generation is crucial for various optical applications.
    • Temporal coherence of the seed beam significantly influences supercontinuum output.
    • Understanding noise mechanisms in supercontinuum generation is essential for performance optimization.

    Purpose of the Study:

    • To experimentally compare the performance of laser-driven and amplified spontaneous emission (ASE)-driven supercontinuums (SCs).
    • To investigate the impact of seed beam temporal coherence on SC output characteristics.
    • To analyze the sources of relative-intensity-noise in both types of SCs.

    Main Methods:

    • Generating supercontinuums using an erbium fiber ring laser and an erbium fiber ASE source.
    • Controlling seed beam temporal coherence by adjusting spectral linewidth with an optical filter.
    • Experimentally measuring spectral smoothness, output power, and relative-intensity-noise of the generated SCs.

    Main Results:

    • ASE-driven SCs demonstrated superior spectral smoothness and higher output power compared to laser-driven SCs.
    • The degree of temporal coherence of the seed beam influenced SC performance.
    • High relative-intensity-noise was observed in both laser and ASE-driven SCs, attributed to nonlinear amplification of quantum fluctuations.

    Conclusions:

    • ASE-driven SCs offer advantages in spectral smoothness and output power over laser-driven SCs for supercontinuum generation.
    • Temporal coherence is a critical parameter affecting supercontinuum properties.
    • Quantum fluctuations significantly contribute to relative-intensity-noise in both laser and ASE-driven supercontinuums, regardless of seed coherence.