Browsing by Author "Ker, YC"

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Saturation of large nonresonant third and fifth order optical nonlinearities from ZnSe quantum dots in glass-matrix thin films
(2003-03-01)
Ker, YC
;
Lin, JH
;
Hsieh, WF
;
光電工程學系
;
Department of Photonics
Large nonresonant optical Kerr coefficient without apparent nonlinear absorption was obtained from ZnSe-doped glass thin films grown by pulsed laser deposition. A third nonlinear refractive index of +0.87 to 1.56 cm(2)/GW and fifth order of + 17.2 cm(4)/GW(2) were measured for a light beam having femtosecond pulsewidth with photon energy below one half bandgap using the Z-scan method. Besides the enhancement of the nonlinear refractive index results from the two-photon near resonance and quantum confinement effect, the intensity-induced saturation of nonlinear refractive index is explained by the quadratic optical Stark shift.