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We report degenerate subpicosecond excite-probe experiments at a wavelength close to the absorption peak of an excited vibrational state of two different metalphthalocyanine solutions. By using this technique, we were able to resolve in time the vibrational relaxation within the first electronic excited state of the molecule. A four-level model is used to explain the observed nonlinear response. Theoretical...
The electronic χ (3) nonlinear optical behaviour of blue, thermally evaporated P4BCMU has been investigated at λ = 1.064 μm using TM-polarized grating coupled guided-wave techniques. The analysis involves a rigorous treatment of the electromagnetic fields in the vicinity of the grating and a theoretically generated fit to the nonlinear reflectivity response which yields both the...
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