Mendoza-Yero Omel, Alonso Benjamín, Varela Oscar, Mínguez-Vega Gladys, Sola Iñigo Juan, Lancis Jesús, Climent Vicent, Roso Luis
GROC UJI, Departament de Física, Universitat Jaume I, E12080 Castelló, Spain.
Opt Express. 2010 Sep 27;18(20):20900-11. doi: 10.1364/OE.18.020900.
We carry out a complete spatio-temporal characterization of the electric field of an ultrashort laser pulse after passing through a diffractive optical element composed of several binary amplitude concentric rings. Analytical expressions for the total diffraction field in the time and spectral domain are provided, using the Rayleigh-Sommerfeld formulation of the diffraction. These expressions are experimentally validated. The spatio-temporal amplitude and phase structure of the pulse are measured at different planes beyond the diffractive optical element using spatially-resolved spectral interferometry assisted by an optical fiber coupler (STARFISH). Our results allow corroborating theoretical predictions on the presence of multiple pulses or complex spectral distributions due to the diffraction-induced effects by the hard-edge ring apertures.
我们对超短激光脉冲通过由几个二元振幅同心环组成的衍射光学元件后的电场进行了完整的时空表征。利用瑞利 - 索末菲衍射公式，给出了时域和频域中总衍射场的解析表达式。这些表达式通过实验得到了验证。使用由光纤耦合器辅助的空间分辨光谱干涉术（STARFISH），在衍射光学元件之外的不同平面上测量了脉冲的时空振幅和相位结构。我们的结果证实了关于由于硬边环形孔径的衍射诱导效应而存在多个脉冲或复杂光谱分布的理论预测。
