White-light generation using spatially-structured beams of femtosecond radiation.
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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 (HGn,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 HG01, or HG11 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.
author list (cited authors)
Kaya, N., Strohaber, J., Kolomenskii, A. A., Kaya, G., Schroeder, H., & Schuessler, H. A
complete list of authors
Kaya, N||Strohaber, J||Kolomenskii, AA||Kaya, G||Schroeder, H||Schuessler, HA