Abstract

A new type of the pump–probe technique with temporally incoherent light is proposed for use in the subpicosecond and femtosecond time regions in the wide-wavelength range. This method permits measurement of the longitudinal relaxation time T₁ with the time resolution determined by the characteristic time of the intensity correlation of the incident light independently of its pulse width. For a demonstration of this technique, absorption recovery time T₁ = 180 psec of a dye solution was measured with Q-switched laser pulses of 150-nsec duration. Differences between this method and the corresponding one used to measure the transverse relaxation time T₂ with incoherent light is discussed.

© 1986 Optical Society of America

Time-delayed four-wave mixing using incoherent light for observation of ultrafast population relaxation

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