Abstract
A femtosecond light pulse at in wavelength was generated during filamentation of an intense femtosecond laser pulse propagating along the x axis and polarized between the y and z axes of a KTP crystal. It was proven that the parametric amplification process by a fourth-order nonlinear polarization induces frequency generation at , where the pump light comes from the incident laser and the seed light comes from the generated supercontinuum by filamentation. The wavelength of the generated signal could be turned from 460 to by adjusting the propagation direction in the crystal.
© 2008 Optical Society of America
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