Recently, the High Power Laser Physics Joint Laboratory of Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences proposed a new method for measuring the linear electro-optic coefficient of materials using nonlinear optical technology, and accurately measured the electro-optic coefficient and deuteration of K(H1-xDx)2PO4 crystal. The relationship curve of the rate. Related work was published in "Optics Express" (Optics Express).
The existing electro-optical coefficient measurement methods are mainly based on linear optical effects, and the maintenance of the polarization state during laser transmission has a decisive influence on its measurement accuracy. To this end, the researchers proposed an electro-optical coefficient measurement method based on second-order nonlinear optical technology. This method is only related to the nonlinear optical process in nonlinear materials and has nothing to do with other transmission processes, thus solving the problem that the measurement accuracy is limited by The problem of maintaining the polarization state. Based on this method, the electro-optical coefficients of six DKDP crystals with different deuteration rates are accurately measured, and the relationship between the electro-optical coefficients of K(H1-xDx)2PO4 crystals and the deuteration rate is obtained, and the fourth harmonic of KDP family crystals is systematically studied. The wave generation characteristics provide an important reference for the generation of deep ultraviolet lasers. The proposed method provides a new idea for the measurement of basic parameters of nonlinear optical materials.
Related research has been funded by the National Natural Science Foundation of China, the Shanghai Yangfan Project, the Youth Innovation Promotion Association of the Chinese Academy of Sciences, and the Chinese Academy of Sciences Strategic Leading Science and Technology Project (Class A).
K(H1-xDx)2PO4 crystal (a) Electro-optical coefficient measurement scheme based on non-critical phase matching FHG (b) FHG characteristic based on electro-optical modulation phase matching (c) Linear electro-optical coefficient
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