Controlling phase matching of high-order harmonic generation by manipulating the fundamental field

We study experimentally how to control and improve phase matching of high-order harmonic generation. We use a birefringent lens and a birefringent compensator to obtain a fundamental laser pulse (150 fs, 800 nm, similar to 4 mJ) With two foci Separated by 6.2 mm along the propagation axis and with a controllable phase delay between the polarizations along the optic axes of the birefringent optical components. This enables us to enhance the high-order harmonic conversion efficiency for the high-order harmonics in neon to 3 x 10(-8), a factor of 4 higher compared to a single-focus setup in similar conditions. The enhancement is achieved by improving the phase matching and at the same time maintaining a high intensity in a large generating volume. [S1050-2947(99)04512-6].

Constant, E (author)
Mevel, E (author)
Balcou, P (author)
Descamps, D (author)
Gaarde, M. B (author)
Valette, A (author)
Haroutunian, R (author)
L'Huillier, AnneLund University,Lunds universitet,Atomfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Atomic Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)fysi-alh (author)
AtomfysikFysiska institutionen (creator_code:org_t)

In:Physical Review A (Atomic, Molecular and Optical Physics)60:6, s. 5010-50181050-2947

By the author/editor: Roos, L; Constant, E; Mevel, E; Balcou, P; Descamps, D; Gaarde, M. B; show more...; Valette, A; Haroutunian, R; L'Huillier, Anne; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Atom and Molecul ...

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