Polarization-dependent ultrafast optical nonlinearities of N,N-dimethylformamide at 400 nm  

作　　者：ZHAO Xin XUE Zhiyong LIU Qingyang YAN Xiaoqing 

机构地区：[1]School of Physical Science and Technology,Tiangong University,Tianjin 300387,China [2]Key Laboratory of Weak-Light Nonlinear Photonics,Ministry of Education,School of Physics,Nankai University,Tianjin 300071,China

出　　处：《Optoelectronics Letters》2023年第9期541-547,共7页光电子快报（英文版）

基　　金：the National Natural Science Foundation of China(No.12074202);the Natural Science Foundation of Tianjin City(Nos.22JCYBJC00390 and 20JCQNJC00020)。

摘　　要：Ultrafast optical nonlinearities of N,N-dimethylformamide(DMF)are studied by using polarized light at 400 nm.Both nonlinear refraction(NLR)and stimulated Rayleigh-wing scattering(SRWS)depend on the polarization state of incident beam,while two-photon absorption(TPA)changes negligibly with polarization state.The polarization dependence of SRWS originates from that of NLR via self-focusing effect.Third-order susceptibility elements of DMF were determined,and a method to distinguish the multi-photon absorption signal from SRWS in Z-scan is provided.These results are helpful for the nonlinear optical research of the novel materials dissolved in DMF.

关 键 词：Polarization-dependent ultrafast optical nonlinearities of N N-dimethylformamide at 400 nm 

分 类 号：O437[机械工程—光学工程] O436.3[理学—光学]