Ultrahigh-order wave mixing in noncollinear high harmonic generation
We show that noncollinear high harmonic generation (HHG) can be fully understood in terms of nonlinear optical wave mixing. We demonstrate this by superposing on the fundamental ω1 field its second harmonic ω2 of variable intensity in a noncollinear geometry. It allows us to identify, by momentum co...
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| Veröffentlicht in: | Physical review letters 2011-01, Vol.106 (2), p.023001-023001, Article 023001 |
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| container_title | Physical review letters |
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| creator | Bertrand, J B Wörner, H J Bandulet, H-C Bisson, É Spanner, M Kieffer, J-C Villeneuve, D M Corkum, P B |
| description | We show that noncollinear high harmonic generation (HHG) can be fully understood in terms of nonlinear optical wave mixing. We demonstrate this by superposing on the fundamental ω1 field its second harmonic ω2 of variable intensity in a noncollinear geometry. It allows us to identify, by momentum conservation, each field's contribution (n1,n2) to the extreme ultraviolet emission at frequency Ω = n1ω1 + n2ω2. We observe that the photon (Ω) yield follows an n2 power law on the ω2 intensity, before saturation. It demonstrates that, although HHG is a highly nonperturbative process, a perturbation theory can still be developed around it. |
| doi_str_mv | 10.1103/physrevlett.106.023001 |
| format | Article |
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| title | Ultrahigh-order wave mixing in noncollinear high harmonic generation |
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