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Ultra-high intensity- 300-TW laser at 0.1 Hz repetition rate.

V. Yanovsky, V. Chvykov, G. Kalinchenko, P. Rousseau, T. Planchon, T. Matsuoka, A. Maksimchuk, J. Nees, G. Cheriaux, G. Mourou, and K. Krushelnick

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Abstract

We demonstrate the highest intensity - 300 TW laser by developing booster amplifying stage to the 50-TW-Ti:sapphire laser (HERCULES). To our knowledge this is the first multi-100TW-scale laser at 0.1 Hz repetition rate.

©2008 Optical Society of America

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Figures (3)
Fig. 1.
Fig. 1. Measurements at the output of the booster amplifier. (a). Output beam profile of the HERCULES laser; (b). Output energy of the booster amplifier in dependence on the pump energy, crosses- experimental data, solid line-Frantz-Nodvic calculations for 1.7 J input energy, dashed line- for 3J input energy; (c). Output energy measured at 0.1 Hz for two shot series separated by 6 hours of continuous operation (shots represented by filled circles occurred 6 hours later then open circles shots).

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Fig. 2.
Fig. 2. Compressed-pulse measurements. (a). Autocorrelation of 300 TW pulse, the experimental autocorrelation picture (insert) demonstrates that there is no amplitude front tilt or other spatial variations of the pulse arrival time; (b). Output spectrum: red curve - experimental data, blue curve - Gaussian fit (FWHM=37nm); (c). Intensity profile reconstructed by the SPIDER (red curve), Gaussian-fit-curve of 30.4fs - FWHM (blue-points); d) Spectral phase reconstructed by the SPIDER.

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Fig. 3.
Fig. 3. Focal spot characterization: (a). Intensity distribution in the focal spot of parabolic mirror calculated for corrected wafefront shown in (d); (b). Focal spot measured with a camera for a reference low-energy beam focused by f/1 parabolic mirror, corresponding to wavefront shown in (d), FWHM of the profiles corrected for the resolution of the imaging optics is 1.3 µ; c) Differential wafefront between full energy beam and a reference low energy beam, phase aberrations r.m.s.=0.056λ, P.V.=0.26λ; (d). Low-energy-beam wavefront corrected by deformable mirror, phase aberrations r.m.s.=0.034λ, P.V.=0.24λ.

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