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Enhanced high harmonic generation driven by high-intensity laser in argon gas-filled hollow core waveguide

K. Cassou 1 S. Daboussi 2, 3 O. Hort 4 O. Guilbaud 2, 3 D. Descamps 4 S. Petit 4 E. Mevel 4 E. Constant 4 S. Kazamias 2, 3
1 Dept. Accelerateurs
LAL - Laboratoire de l'Accélérateur Linéaire, CLUPS - Centre Laser de l'Université Paris Sud
2 CLUPS - Centre Laser de l'Université Paris Sud
3 LPGP - Laboratoire de physique des gaz et des plasmas
4 CELIA - Centre d'Etudes Lasers Intenses et Applications
Abstract : We show that a significant enhancement of the photon flux produced by high harmonic generation can be obtained through guided configuration at high laser intensity largely above the saturation intensity. We identify two regimes. At low pressure, we observe an intense second plateau in the high harmonic spectrum in argon. At relatively high pressure, complex interplay between strongly time-dependent ionization processes and propagation effects leads to important spectral broadening without loss of spectral brightness. We show that the relevant parameter for this physical process is the product of laser peak power by gas pressure. We compare source performances with high harmonic generation using a gas jet in loose focusing geometry and conclude that the source developed is a good candidate for injection devices such as seeded soft x-ray lasers or free electron lasers in the soft x-ray range.
Keywords : HIGH-ORDER HARMONICS COHERENT IONIZATION INJECTION PULSES FIELD NM
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Journal articles
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http://hal.in2p3.fr/in2p3-01056358
Contributor : Sabine Starita <>
Submitted on : Monday, August 18, 2014 - 4:57:51 PM
Last modification on : Friday, October 16, 2020 - 3:41:05 AM

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IN2P3 | LAL | CNRS | CEA | CELIA | DAM | UMR8578

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K. Cassou, S. Daboussi, O. Hort, O. Guilbaud, D. Descamps, et al.. Enhanced high harmonic generation driven by high-intensity laser in argon gas-filled hollow core waveguide. Optics Letters, Optical Society of America - OSA Publishing, 2014, 39, pp.3770-3773. ⟨10.1364/OL.39.003770⟩. ⟨in2p3-01056358⟩

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