OPTICAL PULSE INTENSITY AND PHASE MEASUREMENT DEVICE AND METHOD

摘要

Provided are a method and an apparatus for measuring the spectral intensity and phase of a light pulse having an arbitrary time duration. The apparatus is characterized in that it includes: a nonlinear mixing means for generating a signal light pulse expressed by the following Formula (˜ denotes an operator representing general nonlinear mixing, and ± denotes a coefficient which is proportional to a nonlinear susceptibility in the nonlinear mixing) by nonlinearly mixing a reference light pulse having an electric field E r (t-Ä) delayed by an optical delay means and a measurement target light pulse having an electric field E 0 (t); and E r �¢ t - Ä + ±E r �¢ t - Ä * E 0 t an imaging spectrum device for spectrally splitting the signal light pulse and outputting a Fourier transform signal expressed by the following Formula (F denotes a symbol indicating Fourier transform, * denotes a complex conjugate, and R denotes a symbol indicating a real part), F �¢ E r �¢ t - Ä 2 + ±F �¢ E r �¢ t - Ä * E 0 t 2 + 2 �¢ R ±F �¢ E r �¢ t - Ä * ‹ F �¢ E r �¢ t - Ä * E 0 t wherein the intensity and phase of the measurement target light pulse are obtained from a signal (frequency resolved optical gate signal) of the second term of the Fourier transform signal and a signal (electro-optical sampling signal) of the third term of the Fourier transform signal.