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In this paper, we investigate the sum-frequency properties of potassium niobate ( $$\hbox {KNbO}_{3}$$ KNbO 3 ) nanoneedles. Based on the results, we achieve a rough Cross-correlation frequency-resolved optical gating (XFROG) measurement of super-continuum pulses, including the pulse’s‘ time/frequency-dependent intensity. This approach is promising in several aspects: First, due to the nanometer...
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