Enhancement of the time resolution of a picosecond absorption spectrometer by selection of the duration of laser radiation pulses

A method is proposed for monitoring the relative change in the duration of picosecond pulses. This method is based on second harmonic generation. It is shown that selecting pulses according to their duration in an absorption spectrometer raises the accuracy of recording of the kinetic curve and increases the time resolution of this method. The laser radiation pulses are selected on the basis of their duration by an automated control and data acquisition system constructed using microprocessor technology.