用Z-扫描技术研究量子点的非线性折射率  

Nonlinear refractive index of quantum dots investigated by Z scan technique

作　　者：李波[1,2] 程晓东[3,2] 

机构地区：[1]江苏联合职业技术学院徐州机电工程分院督导室,江苏徐州221011 [2]哈尔滨工业大学理学院,黑龙江哈尔滨150001 [3]黑龙江电信公司运维部,黑龙江哈尔滨150001

出　　处：《物理实验》2015年第9期29-32,共4页Physics Experimentation

摘　　要：介绍了Z-扫描技术的原理,利用飞秒激光器搭建了实验光路,采用波长为800nm的飞秒激光对3种不同质量分数下的PbS量子点的透射率开展了Z-扫描技术的研究,测量得到了样品的闭孔Z-扫描曲线和开孔Z-扫描曲线,推导出PbS量子点三阶非线性折射率.实验结果表明:样品有较强的非线性折射,其折射率受质量分数的影响较大,质量分数越高,非线性折射率越大.The principle of Z scan technique was described, and the transmittance of PbS of differ ent doping levels was extensively investigated by Z scan technique which was carried out using 800 nm femtosecond laser excitation. Close and open apertures Z scan data of the samples were measured. The third-order nonlinear optical refractive index of PbS was deduced. It was interesting that the val- ue of nonlinear refractive index increased with the doping levels of the quantum dots.

关 键 词：量子点 Z-扫描 非线性折射率 

分 类 号：O437[机械工程—光学工程]