Broadband IR supercontinuum generation using single crystal sapphire fibers

Jae Hun Kim, Meng Ku Chen, Chia En Yang, Jon Lee, Shizhuo Yin, Paul Ruffin, Eugene Edwards, Christina Brantley, Claire Luo

    Research output: Contribution to journalArticle

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    Abstract

    In this paper, an investigation on broadband IR supercontinuum generation in single crystal sapphire fibers is presented. It is experimentally demonstrated that broadband IR supercontinuum spectrum (up to 3.2μm) can be achieved by launching ultra-short femtosecond laser pulses into single crystal sapphire fiber with a dimension 115μm in diameter and 5cm in length, which covers both the near IR spectral region and the lower end of the mid-IR spectral range. Furthermore, the mechanism of supercontinuum generation in single crystal sapphire fibers is briefly addressed. When the fiber length is shorter than the dispersion length, the self-phase modulation dominates the broadening effect. In this case, the broad supercontinuum spectrum with a smooth profile can be obtained. However, when the fiber length is longer than the dispersion length, the soliton-related dynamics accompanied by the self-phase modulation dominates the broadening effect. There are discrete spikes in the spectrum (corresponding to different order solitons). The above assumption of supercontinuum generation mechanism is quantitatively modeled by the computer simulation program and verified by the experimental results. Thus, one can adjust the spectral profile by properly choosing the length of the sapphire fibers. The broad IR spectral nature of this supercontinuum source can be very useful in a variety of applications such as broadband LADAR, remote sensing, and multi-spectrum free space communications.

    Original languageEnglish (US)
    Pages (from-to)4085-4093
    Number of pages9
    JournalOptics Express
    Volume16
    Issue number6
    DOIs
    StatePublished - Mar 17 2008

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    All Science Journal Classification (ASJC) codes

    • Atomic and Molecular Physics, and Optics

    Cite this

    Kim, J. H., Chen, M. K., Yang, C. E., Lee, J., Yin, S., Ruffin, P., Edwards, E., Brantley, C., & Luo, C. (2008). Broadband IR supercontinuum generation using single crystal sapphire fibers. Optics Express, 16(6), 4085-4093. https://doi.org/10.1364/OE.16.004085