Waveform reproduction method of short optical pulses

摘要

PROBLEM TO BE SOLVED: To simply regenerate an intensity waveform and a chirp characteristic of short light pulses without using a complicate measuring system. ;SOLUTION: An intensity self correlation waveform of a short light pulse to be measured is measured by an auto collimator and Fourier transformed, thereby obtaining an intensity power spectrum |I(ω)|². At the same time, an electric field power spectrum |E(ω)|² is obtained with the use of a light spectrum analyzer. A phase ϕ(t) accompanying an electric field waveform e(t) in a time area is supposed and changed a little by a little. In this state, a Fourier transform and an inverse Fourier transform are repeatedly carried out to the power spectrum |I(ω)|², |E(ω)|² until an error of a measured value |I(ω)| and a calculated value |I'(ω)| of a square root of the intensity power spectrum becomes minimum.;COPYRIGHT: (C)1998,JPO