Saturation of Large Nonresonant Third and Fifth Order Optical Nonlinearities from ZnSe Quantum Dots in Glass-Matrix Thin Films
Y.T. KerInstitute of Electro-Optical Engineering, National Chiao Tung University, 1001 Ta-hsueh Rd., Hsinchu 30050, Taiwan, R.O.CJa‐Hon LinInstitute of Electro-Optical Engineering, National Chiao Tung University, 1001 Ta-hsueh Rd., Hsinchu 30050, Taiwan, R.O.CWen–Feng HsiehInstitute of Electro-Optical Engineering, National Chiao Tung University, 1001 Ta-hsueh Rd., Hsinchu 30050, Taiwan, R.O.C
2003en
ABI
Abstract
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 cm2/GW and fifth order of +17.2 cm4/GW2 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.
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