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This study presents an innovative method for analyzing spatiotemporal couplings induced by an optical element, using a scanning white-light interferometer. This study, which measured the induced spatiotemporal couplings through a novel analysis method of an interferogram of the white-light interferometer, emphasizes that commonly used optics, such as simple lenses, can generate spatiotemporal couplings that degrades spatiotemporal focal intensity, and quantifies it through experimental measurements rather than theoretical analysis. The analysis method involves the Fourier transformation at each transverse position along the scanning axis and frequency-resolved unwrapping in the transverse plane to obtain frequency-resolved wavefronts and dispersion. From the results of frequency-resolved wavefronts and dispersion, the spatiotemporal couplings induced by the optical elements can be reconstructed. The reconstructed results, validated against theoretical simulations, confirm the precision of the technique. This approach offers significant contributions to ultrafast high-power laser systems by providing an improved technique for characterizing spatiotemporal couplings induced by optical systems and for selecting appropriate optical components suitable for the laser’s specifications.
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