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For the LMJ (Laser MégaJoule) project, a programmable low-voltage temporal pulse shaping system of the fiber laser pilot beam is required. A possible solution of a LiNbO3 integrated optical amplitude modulator driven by a programmable electrical waveform generator. Thomson Microsonics (TMX) has addressed this solution and this paper presents the results of the preliminary study supported partially by CEA fundings.The main requirements are as follows:-optical wave length 1 .053 pm -input optical power 5 W peak, 2 mW averaged -optical insertion loss 6 dB -on-off ratio > 50dB -fully programmable shape: sampling period 300 Ps maximum pulse length 20 ns dynamic range 50 dB rising and falling edges 300 ps full scale We report the TMX original approch for the design of the non trivial fast waveform generator (based on low cost components) and the fully compliance with the requirements of a first subscale prototype. We present then the first very promising experimental results on a <> processed amplitude modulator which exhibits insertion losses and on-off ratio in compliance with the requirements. 618 SPJE Vol. 3047 • 0277-786X/971$l 0.00 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/22/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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