关键词: 相干干涉/
自相位调制/
热透镜效应/
光学非线性效应
English Abstract
Formation mechanism of coherent rainbows
Sun Tian-Jiao1,2,Qian Xuan1,2,
Shang Ya-Xuan1,2,
Liu Jian1,2,
Wang Kai-You1,2,
Ji Yang1,2
1.State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
2.College of Materials Science and Opto-Electronic Technology, School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
Fund Project:Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0301202), the National Natural Science Foundation of China (Grant Nos. 11674311, 61674146, 61774144), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDPB06), and the K. C. Wong Education Foundation, China.Received Date:04 May 2018
Accepted Date:05 July 2018
Published Online:20 September 2019
Abstract:Focusing white laser into samples, many colorful rings (coherent rainbows) come out. Such phenomena have been observed in many materials like water, acetone, absolute ethyl alcohol, soft drink and other liquids, and ice, colored glass, plastics, wax and other solids. From the center of the coherent rainbows to the outer side, the distance between neighboring rings becomes larger and larger. The coherent rainbow is an interference effect, whose optical path difference is induced by locally heating the material with the laser beam. Especially, the coherent rainbows from colored glass in reflection mode can be described with a simple formula, with which simulated results fit the observed interference pattern very well. Several possible mechanisms like nonlinear optical effect, thermal lens effect and self-phase modulation effect are excluded.
Keywords: coherent interference/
self-phase modulation/
thermal lens effect/
optical nonlinear effect