| Issue |
EPJ Web of Conferences
Volume 41, 2013
XVIIIth International Conference on Ultrafast Phenomena
|
|
|---|---|---|
| Article Number | 01013 | |
| Number of page(s) | 3 | |
| Section | Attosecond and High-Order Harmonic Generation and Measurement | |
| DOI | https://doi.org/10.1051/epjconf/20134101013 | |
| Published online | 13 March 2013 | |
https://doi.org/10.1051/epjconf/20134101013
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
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