Z-scan technique for investigation of the noninstantaneous optical Kerr nonlinearity.

نویسندگان

  • Bing Gu
  • Hui-Tian Wang
  • Wei Ji
چکیده

By treating laser-induced optical Kerr nonlinearity as a noninstantaneous decaying process, we present the pulse-duration-dependent Z-scan analytical expressions for an arbitrary aperture and an arbitrary nonlinear magnitude. This theory has the capacity to characterize the third-order nonlinear refraction induced by a laser pulse with its temporal duration being much longer than or comparable to the recovery time of the nonlinear effect. Through Z-scan measurements at different pulse durations, the nonlinear refractive coefficient and the recovery time could be determined unambiguously and simultaneously. Furthermore, the theory can be utilized to confirm whether the measured optical Kerr nonlinearity is instantaneous or noninstantaneous with respect to the given pulse duration.

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عنوان ژورنال:
  • Optics letters

دوره 34 18  شماره 

صفحات  -

تاریخ انتشار 2009