Generation and control of ultrafast pulse trains for quasi-phase-matching high-harmonic generation

T. Robinson, K. O'Keeffe, Matthew Zepf, Brendan Dromey, S.M. Hooker

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Two techniques are demonstrated to produce ultrashort pulse trains capable of quasi-phase-matching high-harmonic generation. The first technique makes use of an array of birefringent crystals and is shown to generate high-contrast pulse trains with constant pulse spacing. The second technique employs a grating-pair stretcher, a multiple-order wave plate, and a linear polarizer. Trains of up to 100 pulses are demonstrated with this technique, with almost constant inter-pulse separation. It is shown that arbitrary pulse separation can be achieved by introducing the appropriate dispersion. This principle is demonstrated by using an acousto-optic programmable dispersive filter to introduce third-and fourth-order dispersions leading to a linear and quadratic variation of the separation of pulses through the train. Chirped-pulse trains of this type may be used to quasi-phase-match high-harmonic generation in situations where the coherence length varies through the medium. (C) 2010 Optical Society of America
Original languageEnglish
Pages (from-to)763-772
Number of pages10
Issue number4
Publication statusPublished - 01 Apr 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Statistical and Nonlinear Physics

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