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Spontaneous self-synchronization mechanism for attosecond pulses

Mcdonald, GS and Christian, JM 2008, Spontaneous self-synchronization mechanism for attosecond pulses , in: National Photonics Conference, Photon 08, 26-29 Aug, 2008, Heriot-Watt University, Edinburgh, UK.

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    Abstract

    Ultra-broadband multi-frequency Raman generation is a long-established technique for producing temporal bandwidths that can be of the order of the pump frequency. However, higher-than-optimal intensity beams reduce the bandwidth generated. Many works have considered different media and effects such as coherence preparation and decoration of sidebands with more lines, but the essential phenomenon and its characteristics have proved relatively invariant. Here, we report the discovery of a profoundly new regime of multi- frequency Raman generation. The simple inclusion of strong cavity feedback has uncovered a fundamental modification to the process and its overall characteristics. Firstly, we find that the magnitude of bandwidth generated may be enhanced by up to 100% in comparison with the equivalent cavity-less context. Secondly, this novel feature is accompanied by a self-synchronization of the generated spectrum towards a global fixed- point. This self-organisation of frequency lines can be consistent with formation of pulse- trains with individual pulsewidths less than 300 attoseconds. Importantly, self- synchronization is not only stable against reduction in mirror bandwidth but it has also been identified as an intrinsic effect that is independent of cavity mistuning in strong-cavity regimes. Our investigations show that self-synchronization is indeed most stable in regimes where generated pulsewidths are shortest.

    Item Type: Conference or Workshop Item (Poster)
    Themes: Energy
    Media, Digital Technology and the Creative Economy
    Subjects outside of the University Themes
    Schools: Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Materials & Physics Research Centre
    Journal or Publication Title: Technical Digest: National Photonics Conference, Photon 08, Edinburgh, 2008
    Publisher: Institute of Physics (IoP)
    Refereed: Yes
    Depositing User: GS McDonald
    Date Deposited: 14 Oct 2011 09:21
    Last Modified: 20 Aug 2013 18:14
    URI: http://usir.salford.ac.uk/id/eprint/18318

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