Recently, the research team of Zhu Jianqiang and Liu De'an, a joint lab of high power laser physics at Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, made important research progress in the related technologies of nonlinear optical frequency conversion. A new type of phase matching method, Voltage Harmonic Phase Matching . Relevant research results published in the "Physical Review Letters." The voltage-tuned phase matching method overcomes the problem that the conversion efficiency in the high-power laser system is sensitive to the change of angle, temperature and wavelength by introducing the external electric field and using the linear electro-optic effect of the material to achieve the phase matching so as to obtain the maximum conversion efficiency output. Flexible and precise control of the refractive index of electro-optic materials, and then expand the traditional nonlinear materials, and even low birefringence and isotropic materials in nonlinear optics applications. In order to validate this new method, Shanghai Optomechanic Research team designed ingenious proof-of-principle experiments. By applying the linear electro-optic effect and the nonlinear wave-light interaction in a single DKDP crystal simultaneously, the successful demonstration of the linear electro-optical effect The manipulation of the nonlinear interaction between light waves proves the feasibility and effectiveness of this method. "Nonlinear optical frequency conversion technology greatly enhances the practicability of lasers in various fields and shows significant research potential in many disciplines." Zhu Jianqiang said that in order to achieve efficient frequency conversion, the interaction between the light waves satisfies Phase matching is an important precondition. Due to the dispersion of materials, accurate phase compensation for dispersion caused by dispersion is the key challenge for efficient frequency conversion. Researchers have also been trying to solve this problem in different ways. Experts believe that the voltage tuning phase matching method proposed by the Shanghai Optical Machinery Research Group not only provides a new way for designing novel nonlinear optical devices but also provides a new direction for further research on nonlinear optical interactions.
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