Phosphate Deep UV Nonlinear Optical Crystal Materials of Fujian Institute of Materials Development Progresses

Due to its short wavelength and high energy, deep ultraviolet lasers have extremely important applications in microscopic detection, micro area recording and other fields. The generation of deep ultraviolet lasers mainly depends on the frequency conversion device material, that is, the frequency conversion capability of deep ultraviolet nonlinear optical crystals. At present, China is the only country in the world that has mastered deep-ultraviolet all-solid-state laser technology. Deep-ultraviolet non-linear optical crystals mainly focus on the development of borate systems, but the actual application of deep-ultraviolet nonlinear optical crystals is only KBBF. The study is of great significance.

Under the support of the National Natural Science Foundation of China's Outstanding Youth Fund and major research projects, the research team headed by Chen Ling, a key laboratory of the Institute of Photonics Chemistry and Physics of the Institute of Material Structure of the Chinese Academy of Sciences, prepared the tripolyphosphate as the basic structure. The unit is constructed of a deep UV nonlinear optical crystal, Ba3P3O10X (X = Cl, Br), in which the Ba3P3O10Cl (BPOC) single crystal has an optically transparent wavelength as low as 180 nm (~7 eV) and exhibits excellent output at 266 nm frequency multiplication. The nonlinear phase matching performance and response intensity of 0.6 times KDP, therefore, the compound is expected to be applied in the field of deep ultraviolet non-linear lasers. B

a3P3O10X (X = Cl, Br) is the first non-borate deep-ultraviolet nonlinear optical crystal. Compared with the known sodium tripolyphosphate, due to the space accumulation, the tripolyphosphate basic building block has passed through PO. Key rotation, from the center of the symmetry to the asymmetry of the center of the transition. This discovery also provides an important reference for the structural design of nonlinear optical crystals. The relevant research results were published in the "J. Am. Chem. Soc., 2013".

In addition, the research team also adopted a series of structural modulation and assembly ideas to obtain a series of nonlinear optical crystal materials with composite functions and strong second-order nonlinear optical response, such as: AXII4XIII5Se.

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