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Measurement of nonlinear refractive index of ethyl red by interference of capillary |
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| Authors: | Shengwen Qi Yongliang Liu Tang Xu Chunping Zhang |
| Institution: | a Department of Physics, Dezhou University, 566 Daxue Road, Dezhou, Shandong 253023, China b The Key Laboratory of Weak Light Nonlinear Photonics, Nankai University, Ministry of Education, Tianjin 300457, China c Measurement Center, Zhanjiang Normal College, Zhanjiang 524048, China d Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China |
| Abstract: | Using the intensity distribution of interference fringes formed by a capillary filled with transparent liquid, the variations in refractive index (RI) of nonlinear optical materials, corresponding to change of the intensity at the centre of fringes for a period, were deduced. With this conclusion, we measured variations in RI of ethyl red (ER) solution excited by a 535-nm-15 mW-laser, and found that the change of RI is 0.00504 and the corresponding effective index of refraction is −1.06 × 10−9, for which the order of magnitude is same as that measured by Z-scan. The influences on the accuracy of the method, such as temperature, beam and fringe contrast, were analyzed. This is a novel and simple method for measuring the RI of nonlinear optical materials. |
| Keywords: | 42 65 Hw 42 25 Hz |
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