The refractive index of a type IIa CVD-grown single-crystal diamond was measured by ellipsometry from the near ultraviolet to the near infrared region of the spectrum. As a consequence, a one term Sellmeier Equation with coefficents of B 1 = 4.658 and C 1 = 112.5 for the refractive index of diamond, for the wavelength range from 300 to 1650 nm, was derived that is only as accurate as the input data, +/− 0.002. The experimental results in this paper between 800 and 1650 nm are new, adding to the values available in the literature.
A series of cobalt(II) complexes comprising either triorganosiloxide or tris(tertbutoxy)siloxide ligands have been synthesized and characterized. A mononuclear constitution is enforced through the incorporation of bi-and tridentate N-donor ligands. The resultant 4or 6-coordinate complexes have been identified by single-crystal X-ray diffraction analysis and have been assessed for their potential as molecular precursors to hybrid cobalt/silicon oxide thin film materials by thermogravimetric analysis. A TMEDA adduct of the bis-ligated Co(II) tris(tert-butoxy)siloxide species has been utilized as a single-source precursor for the AACVD of aesthetically attractive blue composite films. Analysis by PXRD, SEM, EDS and XPS indicated the production of amorphous, continuous films with the bulk compositions reflecting the cobalt, silicon and oxygen stoichiometry of the molecular precursor complex.
Microwave assisted chemical vapour deposited bulk diamond products have been used in a range of high power laser systems, due to low absorption across a range of wavelengths and exceptional thermal properties. However the application of polycrystalline products has frequently been limited to applications at longer wavelengths or thermal uses outside of the optical path due to the birefringence and scatter that are intrinsic properties of the polycrystalline materials. However, there are some solid state structures, including thin disc gain modules and amplifiers, that will gain significantly in terms of potential output powers if diamond could be used as a heat spreader in the optical path as well as a heat spreader on the rear surface of the disk. Therefore single crystal grades of diamond have been developed that overcome the limitations of the polycrystalline material, with low absorption, low scatter and low birefringence grades for demanding optical applications. We will present new data, characterising the performance of these materials across infra-red and visible wavelengths with absorption coefficient measured by laser calorimetry at a range of wavelengths from 1064 nm to 452 nm.
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