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Abstract

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 includes: a nonlinear mixing means for generating a signal light pulse expressed by the following Formula (★ denotes an operator representing general nonlinear mixing, and α 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−τ) delayed by an optical delay means and a measurement target light pulse having an electric field E₀(t); and

description='In-line Formulae' end='lead'E_r(t−τ)+αE_r(t−τ)★E₀(t)description='In-line Formulae' end='tail'

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),

description='In-line Formulae' end='lead'|F[E_r(t−τ)]|²+|αF[E_r(t−τ)★E₀(t)]|²+2R{αF[E_r(t−τ)]*·F[E_r(t−τ)★E₀(t)]}.description='In-line Formulae' end='tail'

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