ZnSe－ZnS量子阱的光学非线性

半导体量子阱及超晶格材料具有室温激子效应以及强的光学非线性从而得到人们广泛的重视。利用半导体量子阱和超晶格可以制备出高速度、低闭值、小尺寸及室温工作的半导体激光器、光双稳器件等一系列光电子器件.

OPTICAL NONLINEARITIES FOR ZnSe-ZnS QUANTUM WELLS

We propose a new method of measuring both the nonlinear refractive index and the nonlinear absorption coefficient using transmission spectum for the first time.We show theoretically that the two parameters can be obtained from the linear and nonlinear transmission spectra of the medium and the distribution function of the dye laser frequency.The method requires very simple experimental apparatus.The nonlinear refractive indices and the nonlinear absorption coefficient and their sign can be obtained from the experimental results in the relatively large wavelength range.We can get two wavelengths at the nonlinear refraction and absorption maximums.We have obtained both thenonlinear refractive index and the nonlinear absorption coefficient as a function of the wavelength for ZnSe-ZnS multiple quantum wells on transparent CaF2 substrate at 77K.