三次谐波法测量K9玻璃的折射率  

Measurement of refractive index of K9 glass with the third-order harmonic method

作　　者：郭泽钦[1] 史彦超[1] 赵培茜[1] 胡碧涛[1] 

机构地区：[1]兰州大学核科学与技术学院,兰州730000

出　　处：《激光技术》2014年第1期128-131,共4页Laser Technology

基　　金：国家自然科学基金资助项目(91026021)

摘　　要：为了测量K9玻璃的折射率,采用三次谐波法,通过调节位移平台使两束平行飞秒激光脉冲在时空上重合,进而产生强烈的三次谐波信号,并进行了理论分析和实验验证,对放入样品前后的实验数据进行处理,得到了样品K9柱面镜的折射率及其测量精度,还对两片折射率未知的衰减片进行了测量,得到了它们的折射率。结果表明,测得的样品折射率与实际折射率符合得很好,证实了该方法测量物体线性折射率的可行性;与传统测量方法相比,该方法具有操作简便、样品容易加工的优点,对样品折射率范围没有限制,具有很重要的实用价值。The refractive index of K9 glass was measured with the third-order harmonic technique, in which two parallel femtosecond laser beams with equal energy were involved. In addition, theoretical analysis and experimental verification were performed, and the refractive index of K9 cylindrical mirror and the measurement accuray were obtained by processing the experimental data before and after putting the sample into the light path. Furthermore, the refractive index of two pieces of attenuators has also been measured. It turned out that the measured refractive index of the sample was in good agreement with the actual data, which verified the validity of this technique to measure the linear refractive index of materials. Compared with the traditional measuring methods, this technique can be operated simply, which has no limit on the range of the refractive index, and the sample is processed easily. Thus, the method of third-order harmonic has very important practical value.

关 键 词：非线性光学 折射率 三次谐波 K9玻璃 

分 类 号：O437[机械工程—光学工程]