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Summary form only given. The last decade has seen a lot of progress in attosecond science and high field physics. Generating energetic, few-cycle laser pulses with a stabilized Carrier-Envelope Phase (CEP) constitutes the first step to access the ultrafast dynamics underlying the interaction of matter with intense, ultrashort coherent light source [1-2]. All these developments place rising demands on lasers with higher average power, shorter pulse duration and higher repetition rate with shot to shot CEP stability.We present here the first results obtained from a new Ti:Sa based Front-End, operating at 10 kHz repetition rate, based on a double-crystal W-like regenerative amplifier coupled to a single pass double crystal amplifier. Doubling the crystals allows to distribute the thermal heat load applied on each water-cooled crystals thus limiting the detrimental effects of thermal lensing especially in the regenerative cavity. Using a Mazzler inside the cavity [3], allows to compensate gain narrowing and to amplify pulses exhibiting a 110 nm spectral width. Output power reaches 2.6 W (0.3 % RMS stability) for 28.5 W pump power before compression. This is roughly 5 times more than in the case of a single crystal regenerative cavity where the output power would be limited to 0.6 W with an equivalent beam quality at optimal pump conditions. Finally, after further amplification in the single pass twocrystal amplifier pumped with 25 W, the output power reaches 7 W (0.35 % RMS stability). The spectral width remains as large as at the regenerative cavity output (Fig. 2a) when spectral shaping is performed using the amplified spectrum (red-shift compensation). Optimal pulse compression with Wizzler-Dazzler correction loop leads to a 17.4 fs pulse duration (16.9 fs FT) as shown in the inset of Fig. 2a.

Original Ti:Sa 10 kHz front-end design delivering 17 fs, 170 mrad CEP stabilized pulses up to 7 W