Darmstadt 2008 – wissenschaftliches Programm

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SYLM: Symposium Lasermaterialbearbeitung

SYLM 1: Strahlquellen

SYLM 1.4: Hauptvortrag

Mittwoch, 12. März 2008, 15:30–16:00, 2B/C

Nonlinear interaction of ultrashort laser pulses in photonic crystal fibers — •Alexander Podlipensky¹, Przemislav Szarniak¹, Nicolas Y. Joly², and Philip St.J. Russell¹ — ¹Max-Planck Research Group (IOIP), University of Erlangen-Nuremberg, Guenther-Scharowsky Str. 1/Bau 24, 91058 Erlangen, Germany — ²Laboratoire de Physique des Lasers, Atomes et Molécules Université des Sciences et Technologies de Lille, 59655 Ville France neuve d'Ascq Cedex

The third-order optical nonlinearity in silica drives nonlinear phenomena in optical fibers such as four-wave mixing, self-phase-modulation, soliton formation, stimulated Raman and Brillouin scattering. Moreover, the optical nonlinear effects strongly depend on sign and magnitude of the GVD of the optical fiber as well as on the duration and shape of the laser pulses. The GVD in the solid-core photonic crystal fiber (PCF) can be tailored over a very broad range by adjusting the core diameter and the microstructure in the cladding. This enables studies of nonlinear optical phenomena both in the CW and in the ns, ps and fs pulsed regimes. Here, we will discuss propagation and nonlinear interaction of ultrashort laser pulses in highly nonlinear PCF. We have performed detailed numerical and experimental studies of the propagation of 110 fs laser pulses at 800 nm and discovered that the break-up of higher order solitons (fission) occurs in three distinct regimes defined by the input power. At higher input power levels the soliton dynamics demonstrates inelastic soliton collisions and formation of bound soliton pairs under the particular circumstances.