High-order solid-surface harmonics for sub-femtosecond pulse generation

Tsuneyuki Ozaki; Jean-Claude Kieffer; John A. Nees; Gérard A. Mourou; Hiroto Kuroda

doi:10.1117/12.567528

16 November 2004 High-order solid-surface harmonics for sub-femtosecond pulse generation

Tsuneyuki Ozaki, Jean-Claude Kieffer, John A. Nees, Gérard A. Mourou, Hiroto Kuroda

Proceedings Volume 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers; (2004) https://doi.org/10.1117/12.567528
Event: Photonics North, 2004, Ottawa, Ontario, Canada

Abstract

Past works have used high-order harmonics in gas targets to demonstrate attosecond pulse generation. However, recent theoretical simulations have shown that solid-surface harmonics can also be used to produce attosecond pulses. Solid-surface harmonics are generated when a high-intensity femtosecond laser pulse irradiates a solid target surface at an oblique incidence angle. The conversion efficiency of this phenomenon increases rapidly with increasing pump laser intensity, and there is also no presently known upper limit in the pump intensity that can be used. Accordingly, this method possesses the potential for high-energy attosecond pulse generation. The main aim of this paper is to experimentally clarify the optimal conditions for highly efficient solid-surface harmonic generation. We demonstrate up to the 16th harmonic (49.1 nm wavelength) of a Ti:sapphire laser using modest pump intensities of 4×10¹⁶ W cm^-2 irradiating a silicon wafer target. Investigations with low-order harmonics have revealed a large dependence of harmonic conversion efficiency on the target material. Furthermore, a drastic increase in the harmonic intensity has been observed by repetitively irradiating a metallic-coated target.

Citation Download Citation

Tsuneyuki Ozaki, Jean-Claude Kieffer, John A. Nees, Gérard A. Mourou, and Hiroto Kuroda "High-order solid-surface harmonics for sub-femtosecond pulse generation", Proc. SPIE 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers, (16 November 2004); https://doi.org/10.1117/12.567528

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