Abstract
Applying the theory of nonlinear optical conductivity for an electron—phonon system, we propose a new method to obtain the line-widths of nonlinear optical conductivity in rectangular quantum wires (RQW). General analytical expressions of the nonlinear absorption power (NLAP) are obtained in the presence of an intense external field. A two-photon absorption process is taken into the result. The dependence of NLAP on the photon energy and the wire's size are numerically calculated and graphically plotted for a specific RQW. From graphs of the NLAP, we obtain line-widths as profiles of curves. The dependence of the line-widths on the temperature and parameters of a RQW are reasonable in comparison with some available theoretical and experimental results.
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