Abstract
Achieving full control of microscopic motion of free electrons and other charged particles in free space and in matter has been a major goal in ultrafast physics [1]. Such a control can be realized using single cycle optical fields of attosecond duration that can be Fourier synthesized by manipulating the amplitude and phase of the components of a frequency comb that spans more than one octave. We have generated a frequency comb by molecular modulation whereby two laser pulses are used to drive the Raman coherence of a molecule [2]. When the two laser pulses are the fundamental and the second harmonic they form the first two components of a harmonic comb. Periodic waveforms synthesized from this harmonic comb then have a constant carrier-envelope phase. The electric field waveform is stable over time and space [3].
© 2014 Japan Society of Applied Physics, Optical Society of America
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