Abstract
A novel technique to measure the frequency resolved temporal image of a single ultrashort light pulse without use of a spectrometer is presented and analyzed theoretically. This technique is based on a single-shot nonlinear autocorrelator and utilizes the relation between the angular distribution of light produced in the autocorrelator and the spectrum of initial pulse. We analyze the angular distribution of light produced in the correlators with different nonlinear processes: second-harmonic generation, self-diffraction and Kerr optical gating. The self-diffraction autocorrelator is the most convenient and unambiguous for spectral measurements, while in the optical-gating autocorrelator the spectral information is nearly spoiled. An optical scheme with a slit diaphragm and cylindrical lens is presented where the transverse and angular distributions of the output beam are combined to produce the two-dimensional time-frequency image of initial pulse.
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