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A significant enhancement of the terahertz generation efficiency via two-color laser-induced air ionization, up to 10−3, is observed with increasing pump wavelength. Terahertz peak fields up to 4.4 MV/cm were obtained using 400 μJ pulse energy.
We show that high-intensity Airy pulses propagating in Kerr-type nonlinear media can preserve their self-accelerating features under appropriate conditions. By engineering the input pulses, controllable spectral shifting and reshaping are achieved.
We report a CMOS-compatible monolithic device for the amplitude and phase characterization of ultrafast optical pulses based on FWM, working up to 1THz bandwidth and 100ps time-duration thanks to a new phase-recovery algorithm for X-SPIDER.
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