EPJ Web of Conferences
Volume 41, 2013XVIIIth International Conference on Ultrafast Phenomena
|Number of page(s)||3|
|Section||Attosecond and High-Order Harmonic Generation and Measurement|
|Published online||13 March 2013|
Quasi-phase-matching of high harmonic generation using counter-propagating pulses
Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, 0X1 3PU, United Kingdom
We investigate quasi-phase-matching over a range of harmonic orders using trains of up to 8 uniformly-spaced counter-propagating pulses. For trains of up to 4 pulses the measured enhancement of the harmonic signal scales with the number of pulses N as (N+1)2, as expected. However, for trains with N > 4, no further enhancement of the harmonic signal is observed. The effect is ascribed to changes in the coherence length with the generating medium. The pressure dependence of quasi-phase-matching is also investigated and it is found that additional peaks in the harmonic intensity are consistent with higher-order QPM processes.
© Owned by the authors, published by EDP Sciences, 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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