Abstract: A crystal is of a non-centrosymmetric structure and belongs to the ?43 m point group of the cubic crystal system. M denotes an alkaline earth metal, which can be Ba, Ca, or Sr, and RE denotes a rare earth element, which can be Y, La, Gd, or Yb. The growth method of the M3RE(PO4)3 crystal comprises steps as follows: (1) polycrystalline material synthesis: MCO3, RE2O3, and phosphorous compound are used as raw materials and blended according to the stoichiometric proportions; then, the phosphorous compound is further added to be excessive; the raw materials are sintered twice to obtain the M3RE(PO4)3 polycrystalline material; (2) polycrystalline material melting; (3) Czochralski crystal growth. The M3RE(PO4)3 crystal prepared by the invention is a high-quality single crystal.

Abstract: The invention is related to a parametric light generation method and its application and belongs to the technical field of laser and nonlinear optics. The generation method comprises steps as follows: a nonlinear optical material that meets the sum-frequency phase-matched conditions, namely it shall satisfy the energy conservation condition ?p+?i=?s and the momentum conservation condition np?p+ni?i=ns?s simultaneously, is provided; laser light with a wavelength of ?p is injected into the said nonlinear optical material as pump light; then, the material will output signal light with a wavelength of ?S, namely the tunable sum-frequency parametric light. With sum-frequency as the basic principle, the invention can realize frequency up-conversion and obtain visible and UV light sources through simple infrared light sources easily.

Abstract: The present disclosure relates to an orthophosphate thermal barrier coating material with high coefficient of thermal expansion and a preparation method thereof. ReM3P3O12 series ceramics with an eulytite crystal structure are prepared by a high-temperature solid-phase reaction for the first time. The ReM3P3O12 ceramic belongs to a ?43 m space group of a cubic crystal system, which not only has a higher melting point and excellent high-temperature phase stability, but also has a lower thermal conductivity and a suitable coefficient of thermal expansion. It can effectively alleviate the stress caused by the mismatch of the coefficient of thermal expansion of the base material and the ceramic layer, so as to meet the requirements of thermal insulation and high-temperature oxidation and corrosion resistance of the hot end parts in long-term service, which has application prospects in the field of thermal barrier coatings.

Abstract: A crystal is of a non-centrosymmetric structure and belongs to the ?43 m point group of the cubic crystal system. M denotes an alkaline earth metal, which can be Ba, Ca, or Sr, and RE denotes a rare earth element, which can be Y, La, Gd, or Yb. The growth method of the M3RE(PO4)3 crystal comprises steps as follows: (1) polycrystalline material synthesis: MCO3, RE2O3, and phosphorous compound are used as raw materials and blended according to the stoichiometric proportions; then, the phosphorous compound is further added to be excessive; the raw materials are sintered twice to obtain the M3RE(PO4)3 polycrystalline material; (2) polycrystalline material melting; (3) Czochralski crystal growth. The M3RE(PO4)3 crystal prepared by the invention is a high-quality single crystal.

Abstract: The invention is related to a parametric light generation method and its application and belongs to the technical field of laser and nonlinear optics. The generation method comprises steps as follows: a nonlinear optical material that meets the sum-frequency phase-matched conditions, namely it shall satisfy the energy conservation condition ?p+?i=?s and the momentum conservation condition np?p+ni?i=ns?s simultaneously, is provided; laser light with a wavelength of ?p is injected into the said nonlinear optical material as pump light; then, the material will output signal light with a wavelength of ?s, namely the tunable sum-frequency parametric light. With sum-frequency as the basic principle, the invention can realize frequency up-conversion and obtain visible and UV light sources through simple infrared light sources easily.