Статья

High-order harmonic generation in xenon: intensity and propagation effects

L. A. LompréService de Physique des Atomes et des Surfaces, Centre d’Etudes Nucléaires de Saclay, 91191 Gif sur Yvette, FranceA. L’HuillierService de Physique des Atomes et des Surfaces, Centre d’Etudes Nucléaires de Saclay, 91191 Gif sur Yvette, FranceM. FerrayService de Physique des Atomes et des Surfaces, Centre d’Etudes Nucléaires de Saclay, 91191 Gif sur Yvette, FranceP. MonotService de Physique des Atomes et des Surfaces, Centre d’Etudes Nucléaires de Saclay, 91191 Gif sur Yvette, FranceG. MainfrayService de Physique des Atomes et des Surfaces, Centre d’Etudes Nucléaires de Saclay, 91191 Gif sur Yvette, FranceC. ManusService de Physique des Atomes et des Surfaces, Centre d’Etudes Nucléaires de Saclay, 91191 Gif sur Yvette, France

1990en

ABI

Аннотация

We present experimental results on high-order harmonic generation in xenon, using a Nd:YAG laser (1064 nm). The harmonic generation efficiency is studied as a function of the laser intensity in the 1013 W/cm2 range. The harmonic conversion rates show a significant change of behavior when the medium becomes ionized (∼1013 W/cm2). This effect can be understood as the change of the nonlinear response of the medium from neutral atoms to ions and also as the influence of free electrons. We study the role of propagation effects (phase matching) by performing experiments using three different lenses (75, 200, and 300 mm) to focus the incident laser beam, thus changing the interaction geometry. Although for each harmonic the conversion rate is strongly dependent on the confocal parameter b (as b3), the behavior of the harmonic frequency distribution shows almost no influence of the focusing geometry.

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Идентификаторы

DOI: 10.1364/josab.7.000754

Цитирования и источники

Цитирований: 2Использованных источников: 0

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