有局域场的三能级Λ系统的瞬态解析结果  

Coherent Transients from Three-level Λ System with Local Field: Analytical Results

作　　者：杜微[1] 阎维贤[1] 

机构地区：[1]山西大学理论物理研究所,山西太原030006

出　　处：《山西大学学报（自然科学版）》2004年第2期148-151,共4页Journal of Shanxi University(Natural Science Edition)

摘　　要：考虑 L orentz局域场效应的影响 ,我们在 L iouville运动方程的基础上用微扰理论分析了一个三能级系统的非线性响应 .在非线性光学响应中 ,两波矢分别为 k1 ,k2 的连续相干脉冲将会在新的方向产生新的光波 .计算之后 ,我们给出四波混频信号关于 L orentz局域场因子 l的表达式 ,发现负时间延迟时在 2 k2 - k1 方向仍有四波混频信号 。Using a perturbation theory based on the Liouville equation of motion,we analyze the nonlinear response of a three-level model system,after considering the Lorentz local field effect.In the nonlinear optical response,two consecutive coherent pulses with the wave vector k_1 and k_2 generate new light waves in the new directions.The expression for the four-wave mixing signal,a third response,is given by accounting of the Lorentz local field.It is found that an four-wave mixing signal still persists in the direction 2k_2-k_1 for the negative time delay,and the frequency of the four-wave mixing signal has a shift related to the Lorentz local field factor l.

关 键 词：局域场 三能级∧系统 四波混频 非线性光学响应 微扰理论 

分 类 号：O437[机械工程—光学工程] O413[理学—光学]