We consider the combined-frequency generation during the noncollinear interaction of very short light pulses in a nonlinear crystal. It is shown that it is possible to obtain information about the duration and spectrum of the optical pulse by measuring the space-angular radiation pattern of the combined frequency in two mutually perpendicular transverse direction. We present results of calculation of the dispersion of direction of the doubling synchronism for the crystals LiIO$_3$, KDP, and ADP.
Department of General Physics and Wave Processes, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119991, Russia
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