Journal
OPTICS EXPRESS
Volume 20, Issue 12, Pages 13337-13346Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.013337
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Funding
- Robert A. Welch Foundation [A1546]
- National Science Foundation (NSF) [0722800, 0555568]
- U.S. Army Research Office [W911NF-07-1-0475]
- Direct For Mathematical & Physical Scien
- Division Of Physics [0722800, 0555568] Funding Source: National Science Foundation
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We studied white-light generation in water using spatially-structured beams of femtosecond radiation. By changing the transverse spatial phase of an initial Gaussian beam with a 1D spatial light modulator to that of an Hermite-Gaussian (HG(n,m)) mode, we were able to generate beams exhibiting phase discontinuities and steeper intensity gradients. When the spatial phase of an initial Gaussian beam (showing no significant white-light generation) was changed to that of a HG(01), or HG(11) mode, significant amounts of white-light were produced. Because self-focusing is known to play an important role in white-light generation, the self-focusing lengths of the resulting transverse intensity profiles were used to qualitatively explain this production. Distributions of the laser intensity for beams having step-wise spatial phase variations were modeled using the Fresnel-Kirchhoff integral in the Fresnel approximation and found to be in good agreement with experiment. (C) 2012 Optical Society of America
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