(EN) One aspect of the invention concerns a method for characterization of a light beam, comprising the following steps: separation of the light beam by means of a separator optic into a first sub-beam and a second sub-beam; propagation of the first sub-beam over a first optic and of the second sub-beam over a second optic, said first and second optics being respectively arranged so that the first sub-beam on leaving the first optic, referred to as the "reference beam", and the second sub-beam on leaving the second optic, referred to as the "characterized beam", are separated by a time delay tau; recombination of the reference beam and the characterized beam by means of a recombiner optic, in such a way that the beams spatially interfere and form a two-dimensional interference pattern, the two-dimensional interference pattern extending along a first plane; measurement of the spectral frequency of at least one part of the two-dimensional interference pattern by means of a measurement system, calculation of the Fourier transform in the time domain of at least one spatial point of the frequency spectrum, said Fourier transform in the time domain having a time central peak and first and second time side peaks; calculation of the Fourier transform in the frequency domain for one of said first and second time side peaks; calculation of the spectral amplitude AR(omega) and of the space-spectrum phase phi R(chi,gamma, omega) for said Fourier transform in the frequency domain.
(ZH) 本发明的一方面涉及用于光束表征的方法，包括下列步骤：‑通过分离器光学件分离光束为第一子光束和第二子光束；‑第一子光束传播通过第一光学件，并且第二子光束传播通过第二光学件，分别地设置所述第一和第二光学件，这样称为“参考光束”的离开第一光学件时的第一子光束，以及称为“表征光束”的离开第二光学件时的第二子光束被时间延迟τ分离；‑通过复合器光学件的参考光束和表征光束的重组，这样光束空间地干涉和形成二维干涉模式，该二维干涉模式沿着第一平面延伸；‑通过测量系统，至少一部分二维干涉模式的频谱的测量；‑在频谱的至少一个空间点的时域中傅里叶变换的计算，在时域中所述的傅里叶变换具有时间中心峰以及第一和第二时间侧峰；‑对于所述第一和第二时间侧峰之一，频域中傅里叶变换的计算；‑对于所述频域中傅里叶变换，光谱振幅AR(ω)和空间‑光谱相位R(x,y,ω)的计算。
