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We report on the generation of branched optical filaments in air by astigmatically focusing intense femtosecond laser pulses with a pair of orthogonal cylindrical lenses. It is found that the branching angle can be controlled by changing the distance between the two foci of the cylindrical lenses. The evolution of the filament is systematically investigated by capturing beam cross-section profiles...
We experimentally demonstrate third-harmonic generation (THG) by intense femtosecond laser pulse at a central wavelength of ∼800 nm superposed by its second harmonic in air. The third-harmonic signal shows a periodic modulation with a period of ∼0.67 fs when the delay between fundamental and second-harmonic wave is continuously changed. The periodic modulation of THG can be attributed to the interference...
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