Shanghai Optical Institute of nonlinear optical frequency conversion technology research made important progress

Recently, Zhu Jianqiang, a researcher at the Joint Laboratory of High Power Laser Physics at Shanghai Institute of Optics and Fine Mechanics, and a research team led by Prof. Andy Liu made important research progress in the related technologies of nonlinear optical frequency conversion. A new type of phase matching method-voltage tuning phase matching is proposed and experimentally verified. Related research findings are published in Physical Review Letters, January 27, 2017 [Phys. Rev. Lett. 118,043901, (2017)]. The first author of the paper is PhD student Cui Zijian. Reviewers rated the paper "... the topic of this paper has aroused widespread interest among scientists and has yielded new and reliable results and is expected to open a new perspective in nonlinear optics ...".

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.

To validate this new approach, the research team designed ingenious proof-of-principle experiments. By applying the linear electro-optic effect and the non-linear interaction of light waves simultaneously in a single DKDP crystal, we successfully demonstrated the control of the nonlinear interaction between light waves by using the linear electro-optical effect, and proved the feasibility and effectiveness of this method Sex.

Nonlinear optical frequency conversion techniques have greatly increased the practicality of lasers in various fields and have shown significant scientific potential in many disciplines. In order to obtain efficient frequency conversion, it is an important prerequisite to satisfy the phase matching between the interacting light waves. Due to the dispersion of materials, accurate phase compensation for dispersion caused by dispersion is the main challenge to achieve efficient frequency conversion. Researchers have been trying to solve this problem in different ways. Although 1962 N. Bloembergen et al. Proposed angle tuning and quasi-phase matching. In 1966, Hobden demonstrated the technical solutions such as temperature-tuning phase matching. However, there are still some limitations to the phase matching method. The voltage tuning phase matching method put forward by the research team of Shanghai Institute of Optics and Fine Mechanics not only provides a new way for designing novel nonlinear optics, but also provides a new direction for further research on nonlinear optics interaction. (High Power Laser Physics Joint Laboratory Feed)

(A) the refractive index ellipsoid of the cubic system material; (b) the progress of the nonlinear optical frequency conversion technique of Shanghai Institute of Optics and Technology; (c) the refractive index ellipsoid change of the electro-optic effect of DKDP crystal; and Tune DKDP crystal fourth harmonic generation.

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