In this paper, we reported the crystal growth and optical properties of Yb3+ and Er3+ codoped yttrium scandium gallium garnet (YSGG) crystal by the conventional CZ method. The growth conditions and XRD patterns are given out.. Excitation and luminescence spectra were also recorded at room temperature with a Model F111Ai spectrofluorometer using a 980nm LD laser as an excitation source. The results were discussed in detail.
In recent years there has been increasing interest in the synthesis of nanocrystalline metal oxides. Nanostructured garnets are of special interest due to their improved properties such as lower temperature sinterability, greater thermal stability, increased hardness, good optical properties etc. In our idea, the sol-gel method is a useful and attractive technique for the preparation of nanocrystalline powders because of its advantages: good stoichiometric control, the production of ultrafine particles and low temperature. In this paper, we reported the preparation and characterization of Yb3+ and Ho3+ codoped yttrium scandium gallium garnet (YSGG) nanocrystal powders by the sol-gel technique. The phase purity, mass loss, composition and microstructure features of the materials were analyzed by means of X-ray diffraction (XRD), TG analysis, infrared spectroscopy (IR) and transmission electron microscopy (TEM).
In this letter, we report a new electro-optic (EO) polymer film DMACB/PEK-c. After poling of the film the refractive indices nt and nn, viz. the in-film-plane and the normal-to-film plane indices of refraction at 0.63-micrometer and the thickness d were determined using the quasi-waveguide m-line method. The electric field-induced changes in the refractive indices of the film, (delta) nt and (delta) nn, were also independently measured when an electric field was applied normal to the film plane. The EO coefficients of the film, (gamma) 13 and (gamma) 33, are found to be 32.9 pm/V and 82.6 pm/V respectively.
A new electro-optic polymer film PT/PEK-c has been prepared and investigated. This kind of film, especially c-axis oriented one, possesses good nonlinear optical properties. The structure of the film after poling was analyzed by x-ray diffraction. The result showed that the film was c-axis oriented. The transmittance of a 2.33-micrometer-thick film was measured in the wavelength range 320 to approximately 900 nm by means of a recording spectrophotometer. The transmittance of the film exhibited a sharp absorption edge at 360 nm. The optical band gap of the film was found to be 3.06 eV. The dielectric properties of PT/PEK-c film were investigated in terms of the dielectric constant (epsilon) r and the loss factor tg(delta) . They were measured by a capacitance bridge in the frequency range 1 X 102 approximately 3 X 106 Hz. The dielectric constant and the loss factor of a 2.33-micrometer-thick film at room temperature and 10 kHz frequency were determined to be 4.023 and 0.003, respectively.
Preparation, Stability and the optical properties of DMACB/PEK-c film were reported. The films have good transmittance and improved stability. By quasi-waveguide method. The refractive indices of the film, ne and no, were measured, which were 1.65800 and 1.63614 at 0.6328 micrometer, respectively; the film's electro-optic coefficients, (gamma) 33 and (gamma) 13 were also obtained, which were 80.80 pm/V and 32.88 pm/V, respectively.
A new electro-optic polymer film DMACB-PEK-c has been prepared. The refractive indices of the film at 0.63- micrometer, nt and nn, are determined by the quasi- waveguide m-line method. The results of measurement and calculation are: nt equals 1.6573 plus or minus 0.0017, nn equals 1.6278 plus or minus 0.0019.
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