Negative ion photoelectron spectroscopy of organometallic radicals: MCO and HMCO complexes of the first transition series

The effect of a input second-harmonic seed wave on the second-harmonic generation process is described. Experimentally, we demonstrate a 4.6-to-1 modulation depth imposed on the fluence of an intense 1.06 micrometers picosecond pulse by varying the relative phase of a weak second-harmonic control pulse under near phase-matched conditions. This transistor-like action is based on quadratic nonlinearities in KTP.

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