中国物理B ›› 2021, Vol. 30 ›› Issue (12): 124208-124208.doi: 10.1088/1674-1056/ac0039
Asymmetric coherent rainbows induced by liquid convection
Tingting Shi(施婷婷)1,2, Xuan Qian(钱轩)1,2, Tianjiao Sun(孙天娇)1,3, Li Cheng(程力)1,2, Runjiang Dou(窦润江)1,4, Liyuan Liu(刘力源)1,4, and Yang Ji(姬扬)1,2,†
- 1 State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
2 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China;
3 College of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
4 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Asymmetric coherent rainbows induced by liquid convection
Tingting Shi(施婷婷)1,2, Xuan Qian(钱轩)1,2, Tianjiao Sun(孙天娇)1,3, Li Cheng(程力)1,2, Runjiang Dou(窦润江)1,4, Liyuan Liu(刘力源)1,4, and Yang Ji(姬扬)1,2,†
- 1 State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
2 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China;
3 College of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
4 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
摘要： Coherent rainbows can be formed by focusing white-light laser into liquids. They are bilaterally symmetric interference rings with various shapes. Such interference rings arise from the temperature distribution of the liquid induced by laser heating, i.e., thermal lens effect, which changes the refractive index locally and thus the optical path difference. The up-down asymmetry of the interference rings is caused by convection in the liquid. With the increase of the viscosity, the interference rings change their shape from oval to circular shape. After a shutter is opened and the laser shines into the liquid, the interference rings are circular at the beginning. As time goes on, they gradually turn into an oval shape. Let the liquid go a free-fall at the beginning, the interference rings remain circular. All the three experiments have confirmed that the asymmetric interference rings are due to convection in the liquid associated with thermal lens effect. We also numerically simulate the two-dimensional heat conduction with and without convection, whose results agree well with our experimental observations.
中图分类号: (Wave optics)
- 42.25.-p