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We generated 100 mJ infrared pulses using dual-chirped optical parametric amplification (DC-OPA), which is the highest energy ever reported for an infrared femtosecond laser source. These pulses are very useful for strong-field physics research and energy scaling of sub-keV soft X-rays by high-order harmonic generation.
We found a significant difference between the interferometric fringes on the intensity-autocorrelation and those on anisotropy-autocorrelation of an atttosecond pulse train. This result can discriminate multiple two-photon processes ionizing a nitrogen molecule.
We demonstrate nonlinear optical microscopy modulating the spatial overlap between two-color pulses, which provides the enhancement of the three-dimensional spatial resolution and the suppression of the out-of-focus signals in deep imaging.
We demonstrate high-resolution fluorescence microscopy based on a cyclic sequential multiphoton process, which gives rise to fluorescence emission following a sequence of cyclic transitions between the bright and dark states of a fluorophore.
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