The high-order harmonic process is the first and best example of a
complex process where attosecond time-scale dynamics can be coherently
manipulated, thus representing the fastest technology yet devised by
man. Useful examples of this manipulation include methods for phase
matching the high-order harmonic process, for manipulating the spectral
characteristics of the radiation, and for generating attosecond pulses.
In this talk, I will discuss a variety of results from our group,
including recent work that uses counter-propagating pulsetrains to
manipulate the phase of the recolliding electron and thus increase the
efficiency of the generation process. I will also discuss the unique
characteristics of HHG that present both challenges and opportunities in
exploiting it as a nonlinear-optical process.
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