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We experimentally investigate the generation of above-threshold harmonics completely from argon atoms on an excited state using mid-infrared femtosecond laser pulses. The highly nonlinear dependences of the observed signal on the
We report on a systematic experimental study on the fluorescence spectra produced from a femtosecond laser filament in air under a high electric field. The electric field alone was strong enough to create corona discharge (CD). Fl
We produced 5-mJ, 6.5-fs visible pulses at a repetition rate of 1 kHz using filamentation in a gas cell filled with kryptonfollowed by spectral selection and phase compensation by a combination of dielectric mirrors. The visible p