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Phys. Rev. A 78, 033825 (2008) [6 pages]

Generation and control of extreme blueshifted continuum peaks in optical Kerr media

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D. Faccio1,5, A. Averchi1,5, A. Lotti1,5, M. Kolesik2, J. V. Moloney2, A. Couairon3,5, and P. Di Trapani1,4,5
1CNISM and Department of Physics and Mathematics, Università dell’Insubria, Via Valleggio 11, IT-22100 Como, Italy
2Arizona Center for Mathematical Sciences and Optical Sciences Center, University of Arizona, Tucson, Arizona 85721, USA
3Centre de Physique Théorique, CNRS, École Polytechnique, F-91128, Palaiseau, France
4Department of Quantum Electronics, Vilnius University, Saulėtekio Avenue 9, bldg.3, LT-10222, Vilnius, Lithuania
5Virtual Institute for Nonlinear Optics, Centro di Cultura Scientifica Alessandro Volta, Villa Olmo, Via Simone Cantoni 1, 22100 Como, Italy

Received 19 June 2008; published 18 September 2008

We demonstrate tunable, extremely blueshifted continuum in λ=1.055 μm ultrashort laser pulse filamentation in silica. Close to threshold, the continuum appears as a single, isolated blue peak. The spectral position of the two supercontinuum components can be tuned and a regime with encompassing fundamental and second harmonic is possible to achieve. At higher energies, the continuum expands in bandwidth starting from the blue peak. The spectral dynamics and tunability are explained in terms of X-wave generation and intrafilament pulse splitting which may be controlled by modifying the input pulse focusing conditions.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.78.033825
DOI:
10.1103/PhysRevA.78.033825
PACS:
42.65.Re, 42.65.Ky, 42.65.Jx
 
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