【摘要】 用紧致密度矩阵和弛豫时间近似方法，研究在非对称半抛物量子阱中的二阶光学非线性．该非线性是由子能带间的共振跃迁引起的，在波长为１０．６μｍ时，光学整流系数可达０．１０４ｍｍ／Ｖ（比ＧａＡｓ晶体中高１０５倍），二次谐波产生系数可达３．１μｍ／Ｖ（比ＧａＡｓ晶体中高１０４倍）．在相同条件下，比阶梯阱模型的结果大一个数量级，比“极化球”模型的结果大两个数量级．更多还原

【Abstract】 Second order optical nonlinearities in an asymmetric semi parabolic quantum well due to resonant intersubband transition were studied by a compact density matrix means. The results show that optical rectification coefficient is 0.104 mm/V(10 5 times as high as that in bulk GaAs) at 10.6 μm in optimized condition and second harmonic generation coefficient is 3.1 μm/V (10 4 times as high as that in bulk GaAs).更多还原