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Phys Rev Lett. 2008 Apr 25;100(16):163906. Epub 2008 Apr 25.

Sub-single-cycle optical pulse train with constant carrier envelope phase.

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  • 1Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan.


We describe the synthesis of periodic waveforms consisting of a train of pulses that are 0.83 cycles long and have an electric field pulse width of 0.44 fs using 7 Raman sidebands generated by molecular modulation in H2. We verify by optical correlation that the carrier-envelope phase is constant in these waveforms when they are synthesized from commensurate sidebands. The estimated overall shift of the carrier-envelope phase is less than 0.18 cycles from the first to the last pulse of nearly 10(6) pulses in the pulse train.

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