List of Division publications with links

2013-07-22 12:20 - PHz-wide Supercontinua of Nondispersing Subcycle Pulses Generated by Extreme Modulational Instability

F. Tani, J. C. Travers, and P. St. J. Russell, Phys. Rev. Lett. 111, 033902 (2013)

Modulational instability (MI) of 500 fs, 5µJ pulses, propagating in gas-filled hollow-core kagome photonic crystal fiber, is studied numerically and experimentally. By tuning the pressure and launched energy, we control the duration of the pulses emerging as a consequence of MI and hence are able to study two regimes: the classical MI case leading to few-cycle solitons of the nonlinear Schrödinger equation; and an extreme case leading to the formation of nondispersing subcycle pulses (0.5 to 2 fs) with peak intensities of order 1014 W cm-2. Insight into the two regimes is obtained using a novel statistical analysis of the soliton parameters. Numerical simulations and experimental measurements show that, when a train of these pulses is generated, strong ionization of the gas occurs. This extreme MI is used to experimentally generate a high energy (>1µJ) and spectrally broad supercontinuum extending from the deep ultraviolet (320 nm) to the infrared (1300 nm).