Self-focusing and continuum generation are explored in gases using ultrashort 625 nm pulses. With large f-number optics, we observe reconstruction of the spatial profile of a diffraction-limited beam which has self-focused even though the beam experiences severe spectral modifications. Conical emission originating from the prefocal region is also seen.
Date de publication
IEEE Journal of Quantum Electronics25, nº 12 (1989) : 2634–2639.