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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 2001),
  • paper CTuP5

Various lacunary polyoxometalates: cluster molecule crystals as new designable inorganic, nonlinear materials for the second harmonic generation

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Abstract

Various practical nonlinear crystals have already been developed for a variety of applications. The optimum choice of such nonlinear crystals is different for each case depending on the priority of the required specifications. In this sense, the development of nonlinear crystals for frequency conversion is a still matter of interest in optical engineering. Of the nonlinear crystals, phosphate and borate crystals including BBO, LBO, and CLBO, are widely used to satisfy a variety of requirements.1,2 There have been excellent experimental achievements using these borate crystals. However, almost all the possible material development approaches have already been explored because of the simplicity of the material due to their small molecules. To overcome this limitation of conventional simple inorganic materials, material research on organic compounds has continued intensively to find a highly efficient nonlinear material. In spite of such massive efforts, no realistic nonlinear organic crystal exceeding the conventional inorganic materials has yet been found. In this presentation, we will report the large inorganic, design-flexible, cluster- molecule materials, lacunary polyoxometalates,3,4 that were found to have higher optical nonlinearity than KDP by the powder second- harmonic-generation (SHG) method.5 We will also explain the basic criteria to design the high nonliearity.

© 2001 Optical Society of America

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