The fast ignitor scheme for inertial confinement fusion requires forward driving of the critical density surface by light pressure (hole boring) to allow energy deposition close to the dense fuel. The recession velocity of the critical density surface has been observed to be v/c=0.015 at an irradiance of 1.0×1019 W cm−2 at a wavelength of 1.05 micron, in quantitative agreement with modeling.
We present simulations of the two-colour harmonic response of a one-dimensional model atom exposed to a superposition of two laser fields of varying relative intensities and of non-commensurate frequencies. We show that this interaction can be used to efficiently generate a quasi-continuum of very closely spaced harmonics and explain how such a scheme can be implemented experimentally. We show how the generation process can be described in terms of the beat frequencies between the two fields. Finally, we discuss the limitations of the 1ω-3ω interaction (which has been studied extensively elsewhere).
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