Modeling of pressure induced phase matching in high harmonic generation

S. Kazamias; S. Daboussi; O. Guilbaud; K. Cassou; M. Pittman; D. Ros; B. Cros; G. Maynard

doi:10.1117/12.897288

5 October 2011 Modeling of pressure induced phase matching in high harmonic generation

S. Kazamias, S. Daboussi, O. Guilbaud, K. Cassou, M. Pittman, D. Ros, B. Cros, G. Maynard

Proceedings Volume 8140, X-ray Lasers and Coherent X-ray Sources: Development and Applications IX; 81401D (2011) https://doi.org/10.1117/12.897288
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

We present a comprehensive theoretical analysis of the conditions that lead to absorption limited generation of high order harmonics in the case of low energy, long pulse duration infrared pump laser beams. With these pump laser beam parameters, tight focussing is necessary to reach the high laser intensity required for high non linear response at the atomic level. A limitation of phase-matching is then induced through the so-called Gouy phase shift. We explain how the positive atomic dispersion can compensate for that effect and derive the conditions for perfect phase matching. The influence of gas pressure, harmonic order, maximum laser intensity and focussing conditions are analysed. This work enables a precise separation between pure classical harmonic from possible XPA effects discussed in a recent experiment. It also constitutes a benchmarking of a code under development for quasi phase matching scheme investigation.

Citation Download Citation

S. Kazamias, S. Daboussi, O. Guilbaud, K. Cassou, M. Pittman, D. Ros, B. Cros, and G. Maynard "Modeling of pressure induced phase matching in high harmonic generation", Proc. SPIE 8140, X-ray Lasers and Coherent X-ray Sources: Development and Applications IX, 81401D (5 October 2011); https://doi.org/10.1117/12.897288

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