High-intensity high-order harmonic generation for attosecond autocorrelation measurements

T. Ozaki; H. C. Bandulet; S. Fourmaux; J. C. Kieffer; R. A. Ganeev; H. Kuroda

doi:10.1117/12.619325

21 September 2005 High-intensity high-order harmonic generation for attosecond autocorrelation measurements

T. Ozaki, H. C. Bandulet, S. Fourmaux, J. C. Kieffer, R. A. Ganeev, H. Kuroda

Proceedings Volume 5920, Ultrafast X-Ray Detectors, High-Speed Imaging, and Applications; 592006 (2005) https://doi.org/10.1117/12.619325
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

We demonstrate two methods of high-order harmonic generation, which has the potential of generating high-order harmonics with high intensities. The first method is solid surface harmonics. Using the second harmonic output of the 10 TW, 60 fs Ti:sapphire laser system at the INRS, we have observed multiple soft x-ray harmonics of the 397 nm pump laser. The highest order (23^rd harmonic at 17.3 nm) observed in our experiments are limited by the 17 nm absorption edge of the thick 1.6 μm Al foil, which is used to eliminate the high intensity pump laser. The second method is harmonics from an ablation plume generated using a relatively low intensity prepulse. We demonstrate the generation of up to the 63rd harmonics (λ=12.6 nm) of a Ti:sapphire laser pulse (150 fs, 10 mJ), using pre-pulse (210 ps, 24 mJ) produced boron plasma as the nonlinear medium. The influence of various parameters on the harmonic conversion efficiency was analyzed. Typical conversion efficiencies were evaluated to be between 10^-4 (for third harmonic) and 10^-7 (within the plateau range).

Citation Download Citation

T. Ozaki, H. C. Bandulet, S. Fourmaux, J. C. Kieffer, R. A. Ganeev, and H. Kuroda "High-intensity high-order harmonic generation for attosecond autocorrelation measurements", Proc. SPIE 5920, Ultrafast X-Ray Detectors, High-Speed Imaging, and Applications, 592006 (21 September 2005); https://doi.org/10.1117/12.619325

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