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An experimental proof of the nonlinear dependence of the parametric generation efficiency of the pump power is presented, in the case of noncollinear second harmonic generation. The experiment is performed by using two pulses coming from a Nd-YAG source (λ = 1.06 µm, pulse length of 100 ps, and 76 MHz repetition rate) and sent onto the SHG crystal with a small angle between them. The intensity ratio of the two pump pulses was varied, and the output second harmonic generation signal was detected through a fast photodiode and an oscilloscope. Strong nonlinearity in the conversion efficiency vs the total input pump power has been observed.
© 1994 IEEE
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