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We studied petahertz electronic oscillations with 1.16-PHz frequency using gallium nitride (GaN) wide-bandgap semiconductor. An isolated attosecond pulse with coherent broadband spectrum reveals dipole oscillation with 860-as periodicity in the GaN electron and hole system.
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.
This paper reviews and discusses the concept of nonlinear optical spectroscopy (NLOS) and microscopy employing ultra-broadband laser pulses. A spectral phase modulation technique of the ultra-broadband pulses, which allows the control of nonlinear optical processes, enables multimodal imaging in nonlinear optical microscopy. This technique uses the difference of the excitation spectra of molecules...
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