Investigation of the spectral kinetics of ultrashort light pulses using time holography

On the basis of principles of time holography we suggest a method for recording changes of a spectrum in ultrashort light pulses with a time resolution of up to 10⁻¹⁴ sec. As a clear way to describe the spectrum kinetics, a function of the spectral shift is introduced. We consider, as an example, the possibilities of investigating the spectral-temporal structure of pico- and femtosecond pulses and their transformations on interaction with a dispersion medium. B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68, F. Skorina Ave., Minsk, 220072, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 1, pp. 25–29, January–February, 1999.