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(a) Scheme of the multipass noncollinear optical parametric chirped pulse amplifier (NOPCPA), , , and are flat mirrors highly reflective @ 800 nm, the distance between mirrors and is 190 mm, (b) amplified beam alignment with respect to the pump beam.
Experimental gain (left axis) and output energy (right axis) of the amplifier vs pump pulse energy (solid squares). The gain of an unsaturated amplifier fitted to the experimental data is shown by a dashed curve. Insets in the figure show spectra of the output pulse measured at energies (a) , (b) , (c) .
Output beam profile. Curves on sidewalls show beam crosssections fitted with Gaussian functions.
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