Retrieving the Amplitude and Phase Parameters of an Ultrashort Wave Packet by Autocorrelation Methods |
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Authors: | A A Babin V I Eremin A V Kirsanov |
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Institution: | (1) Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia |
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Abstract: | Based on an analysis of the signal of an interferometric intensity autocorrelator, we demonstrate theoretically and experimentally a simple technique for retrieving the temporal distributions of the amplitude and phase of an ultrashort light pulse. Assuming that a phase-modulated wave packet has a Gaussian envelope, we derive an analytical expression for the autocorrelator signal in the cases of linear- and quadratic-chirp optical pulses. The experimental and theoretical results are in excellent agreement. In particular, we show that a linear chirp (quadratic phase modulation) can be measured with a good experimental accuracy of no worse than 10%. This yields the possibility of measuring the parameter k2, which describes the dispersion characteristics of a medium in the second order of the dispersion theory, with the same accuracy. Measuring a quadratic chirp by the proposed method is possible only if such a chirp is sufficiently large. |
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