The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform

Kohei Kodaira - One of the best experts on this subject based on the ideXlab platform.

  • Efficient laser performance of Nd:GdVO4 crystals grown by the Floating Zone method.
    Optics Letters, 2003
    Co-Authors: Takayo Ogawa, Yoshiharu Urata, Satoshi Wada, Koichi Onodera, Hiroshi Machida, Hideaki Sagae, Mikio Higuchi, Kohei Kodaira
    Abstract:

    Efficient laser performance is demonstrated with Nd:GdVO4 crystals grown by the Floating Zone method. With a 2-at. % Nd-doped crystal a slope efficiency of 67% is achieved with pumping at 808 nm. We also find that pumping at 879 nm with a bandwidth of 1.8 nm is practical for laser diode pumping. With this pumping level the slope efficiency reaches 78%. High-quality Nd:GdVO4 crystals are successfully grown with as much as 15-at.% Nd concentration by the Floating Zone method without inclusions or macroscopic defects. Homogeneity and high reproducibility of crystal growth are confirmed.

  • efficient laser performance of n dgdvo 4 crystals grown by the Floating Zone method
    Optics Letters, 2003
    Co-Authors: Takayo Ogawa, Yoshiharu Urata, Satoshi Wada, Koichi Onodera, Hiroshi Machida, Hideaki Sagae, Mikio Higuchi, Kohei Kodaira
    Abstract:

    Efficient laser performance is demonstrated with Nd:GdVO4 crystals grown by the Floating Zone method. With a 2-at. % Nd-doped crystal a slope efficiency of 67% is achieved with pumping at 808 nm. We also find that pumping at 879 nm with a bandwidth of 1.8 nm is practical for laser diode pumping. With this pumping level the slope efficiency reaches 78%. High-quality Nd:GdVO4 crystals are successfully grown with as much as 15-at. % Nd concentration by the Floating Zone method without inclusions or macroscopic defects. Homogeneity and high reproducibility of crystal growth are confirmed.

  • Solid-liquid interface shapes in the Floating Zone growth of rutile single crystals
    Materials Research Bulletin, 1994
    Co-Authors: Mikio Higuchi, Kohei Kodaira
    Abstract:

    Abstract In the Floating Zone method with an infrared convergence type heater, the contact between a feed rod and a growing crystal is one of the most serious problems to grow a large-diameter crystal because the contact cause the instability or collapse of the melt Zone. In order to examine the possibility to grow large-size rutile single crystals by the Floating Zone method, the shapes of the solid-liquid interface were investigated as a function of crystal diameter and rotation rate. In the case of growing a 10 mm diameter crystal, the height of interface was easily decreased with increasing crystal rotation rate, which enhanced the strength of forced convection in the melt Zone. However, the height of interface of a 13 mm diameter crystal was not significantly reduced despite the increased rotation rate because of the increased melt volume. This result indicates the difficulty in the Floating Zone growth of large-diameter rutile single crystals only by increasing the rotation rate up to 60 rpm.

  • Effects of Sc2O3 addition on Floating Zone growth of rutile single crystals
    Journal of Crystal Growth, 1992
    Co-Authors: Mikio Higuchi, Junichi Takahashi, Kohei Kodaira
    Abstract:

    Abstract Rutile single crystals doped with Sc2O3 were grown by the Floating Zone (FZ) method. The as-grown crystals were yellowish and transparent after the growth run, whereas an as-grown pure rutile crystal is dark-blue and not transparent even if the crystal growth is done under an oxygen atmosphere. The Sc3+ ions could substitute Ti4+ sites in the rutile structure to form oxygen vacancies, via which oxide ions could easily diffuse as well in Y2O3-doped ZrO2, and consequently transparent as-grown crystals were obtained. The formation of low-angle grain boundaries was appreciably suppressed, but not completely, with the addition of only Sc2O3. Simultaneous addition of Sc2O3 and ZrO2 was effective to obtain transparent and grain-boundary-free rutile single crystals by the Floating Zone method.

Mikio Higuchi - One of the best experts on this subject based on the ideXlab platform.

  • Optical Properties and Thermal Characteristics of the Floating Zone Grown Nd:LuVO4 Crystals
    Advanced Solid-State Photonics (TOPS), 2005
    Co-Authors: Takayo Ogawa, Yoshiharu Urata, Satoshi Wada, Mikio Higuchi, Junichi Takahashi, Toshiyuki Shimizu, Junko Morikawa, Toshimasa Hashimoto
    Abstract:

    High-quality Nd:LuVO4 crystals were successfully grown by the Floating Zone method. Large absorption coefficient of 64cm-1 was observed at 808nm with 1at.% Nd doped crystal. The thermal conductivity of the crystal was measured with temperature wave analysis.

  • Efficient laser performance of Nd:GdVO4 crystals grown by the Floating Zone method.
    Optics Letters, 2003
    Co-Authors: Takayo Ogawa, Yoshiharu Urata, Satoshi Wada, Koichi Onodera, Hiroshi Machida, Hideaki Sagae, Mikio Higuchi, Kohei Kodaira
    Abstract:

    Efficient laser performance is demonstrated with Nd:GdVO4 crystals grown by the Floating Zone method. With a 2-at. % Nd-doped crystal a slope efficiency of 67% is achieved with pumping at 808 nm. We also find that pumping at 879 nm with a bandwidth of 1.8 nm is practical for laser diode pumping. With this pumping level the slope efficiency reaches 78%. High-quality Nd:GdVO4 crystals are successfully grown with as much as 15-at.% Nd concentration by the Floating Zone method without inclusions or macroscopic defects. Homogeneity and high reproducibility of crystal growth are confirmed.

  • efficient laser performance of n dgdvo 4 crystals grown by the Floating Zone method
    Optics Letters, 2003
    Co-Authors: Takayo Ogawa, Yoshiharu Urata, Satoshi Wada, Koichi Onodera, Hiroshi Machida, Hideaki Sagae, Mikio Higuchi, Kohei Kodaira
    Abstract:

    Efficient laser performance is demonstrated with Nd:GdVO4 crystals grown by the Floating Zone method. With a 2-at. % Nd-doped crystal a slope efficiency of 67% is achieved with pumping at 808 nm. We also find that pumping at 879 nm with a bandwidth of 1.8 nm is practical for laser diode pumping. With this pumping level the slope efficiency reaches 78%. High-quality Nd:GdVO4 crystals are successfully grown with as much as 15-at. % Nd concentration by the Floating Zone method without inclusions or macroscopic defects. Homogeneity and high reproducibility of crystal growth are confirmed.

  • Solid-liquid interface shapes in the Floating Zone growth of rutile single crystals
    Materials Research Bulletin, 1994
    Co-Authors: Mikio Higuchi, Kohei Kodaira
    Abstract:

    Abstract In the Floating Zone method with an infrared convergence type heater, the contact between a feed rod and a growing crystal is one of the most serious problems to grow a large-diameter crystal because the contact cause the instability or collapse of the melt Zone. In order to examine the possibility to grow large-size rutile single crystals by the Floating Zone method, the shapes of the solid-liquid interface were investigated as a function of crystal diameter and rotation rate. In the case of growing a 10 mm diameter crystal, the height of interface was easily decreased with increasing crystal rotation rate, which enhanced the strength of forced convection in the melt Zone. However, the height of interface of a 13 mm diameter crystal was not significantly reduced despite the increased rotation rate because of the increased melt volume. This result indicates the difficulty in the Floating Zone growth of large-diameter rutile single crystals only by increasing the rotation rate up to 60 rpm.

  • Effects of Sc2O3 addition on Floating Zone growth of rutile single crystals
    Journal of Crystal Growth, 1992
    Co-Authors: Mikio Higuchi, Junichi Takahashi, Kohei Kodaira
    Abstract:

    Abstract Rutile single crystals doped with Sc2O3 were grown by the Floating Zone (FZ) method. The as-grown crystals were yellowish and transparent after the growth run, whereas an as-grown pure rutile crystal is dark-blue and not transparent even if the crystal growth is done under an oxygen atmosphere. The Sc3+ ions could substitute Ti4+ sites in the rutile structure to form oxygen vacancies, via which oxide ions could easily diffuse as well in Y2O3-doped ZrO2, and consequently transparent as-grown crystals were obtained. The formation of low-angle grain boundaries was appreciably suppressed, but not completely, with the addition of only Sc2O3. Simultaneous addition of Sc2O3 and ZrO2 was effective to obtain transparent and grain-boundary-free rutile single crystals by the Floating Zone method.

Takayo Ogawa - One of the best experts on this subject based on the ideXlab platform.

  • Optical Properties and Thermal Characteristics of the Floating Zone Grown Nd:LuVO4 Crystals
    Advanced Solid-State Photonics (TOPS), 2005
    Co-Authors: Takayo Ogawa, Yoshiharu Urata, Satoshi Wada, Mikio Higuchi, Junichi Takahashi, Toshiyuki Shimizu, Junko Morikawa, Toshimasa Hashimoto
    Abstract:

    High-quality Nd:LuVO4 crystals were successfully grown by the Floating Zone method. Large absorption coefficient of 64cm-1 was observed at 808nm with 1at.% Nd doped crystal. The thermal conductivity of the crystal was measured with temperature wave analysis.

  • Efficient laser performance of Nd:GdVO4 crystals grown by the Floating Zone method.
    Optics Letters, 2003
    Co-Authors: Takayo Ogawa, Yoshiharu Urata, Satoshi Wada, Koichi Onodera, Hiroshi Machida, Hideaki Sagae, Mikio Higuchi, Kohei Kodaira
    Abstract:

    Efficient laser performance is demonstrated with Nd:GdVO4 crystals grown by the Floating Zone method. With a 2-at. % Nd-doped crystal a slope efficiency of 67% is achieved with pumping at 808 nm. We also find that pumping at 879 nm with a bandwidth of 1.8 nm is practical for laser diode pumping. With this pumping level the slope efficiency reaches 78%. High-quality Nd:GdVO4 crystals are successfully grown with as much as 15-at.% Nd concentration by the Floating Zone method without inclusions or macroscopic defects. Homogeneity and high reproducibility of crystal growth are confirmed.

  • efficient laser performance of n dgdvo 4 crystals grown by the Floating Zone method
    Optics Letters, 2003
    Co-Authors: Takayo Ogawa, Yoshiharu Urata, Satoshi Wada, Koichi Onodera, Hiroshi Machida, Hideaki Sagae, Mikio Higuchi, Kohei Kodaira
    Abstract:

    Efficient laser performance is demonstrated with Nd:GdVO4 crystals grown by the Floating Zone method. With a 2-at. % Nd-doped crystal a slope efficiency of 67% is achieved with pumping at 808 nm. We also find that pumping at 879 nm with a bandwidth of 1.8 nm is practical for laser diode pumping. With this pumping level the slope efficiency reaches 78%. High-quality Nd:GdVO4 crystals are successfully grown with as much as 15-at. % Nd concentration by the Floating Zone method without inclusions or macroscopic defects. Homogeneity and high reproducibility of crystal growth are confirmed.

Ali Sayir - One of the best experts on this subject based on the ideXlab platform.

  • A New Method to Grow SiC: Solvent-Laser Heated Floating Zone
    2012
    Co-Authors: Andrew A. Woodworth, Philip G. Neudeck, Ali Sayir
    Abstract:

    The solvent-laser heated Floating Zone (solvent-LHFZ) growth method is being developed to grow long single crystal SiC fibers. The technique combines the single crystal fiber growth ability of laser heated Floating Zone with solvent based growth techniques (e.g. traveling solvent method) ability to grow SiC from the liquid phase. Initial investigations reported in this paper show that the solvent-LHFZ method readily grows single crystal SiC (retains polytype and orientation), but has a significant amount of inhomogeneous strain and solvent rich inclusions.

  • SiC growth by Solvent-Laser Heated Floating Zone
    Materials Science Forum, 2012
    Co-Authors: Andrew A. Woodworth, Philip G. Neudeck, Ali Sayir, David J. Spry, Andrew J. Trunek, J. Anthony Powell
    Abstract:

    In an effort to grow single crystal SiC fibers for seed crystals the following two growth methods have been coupled in this work: traveling solvent and laser heated Floating Zone to create the solvent-laser heated Floating Zone (Solvent-LHFZ) crystal growth method. This paper discusses the results of these initial experiments, which includes, source material, laser heating, and analysis of the first ever SiC crystals (confirmed by synchrotron white beam x-ray topography)

Andrew A. Woodworth - One of the best experts on this subject based on the ideXlab platform.

  • A New Method to Grow SiC: Solvent-Laser Heated Floating Zone
    2012
    Co-Authors: Andrew A. Woodworth, Philip G. Neudeck, Ali Sayir
    Abstract:

    The solvent-laser heated Floating Zone (solvent-LHFZ) growth method is being developed to grow long single crystal SiC fibers. The technique combines the single crystal fiber growth ability of laser heated Floating Zone with solvent based growth techniques (e.g. traveling solvent method) ability to grow SiC from the liquid phase. Initial investigations reported in this paper show that the solvent-LHFZ method readily grows single crystal SiC (retains polytype and orientation), but has a significant amount of inhomogeneous strain and solvent rich inclusions.

  • SiC growth by Solvent-Laser Heated Floating Zone
    Materials Science Forum, 2012
    Co-Authors: Andrew A. Woodworth, Philip G. Neudeck, Ali Sayir, David J. Spry, Andrew J. Trunek, J. Anthony Powell
    Abstract:

    In an effort to grow single crystal SiC fibers for seed crystals the following two growth methods have been coupled in this work: traveling solvent and laser heated Floating Zone to create the solvent-laser heated Floating Zone (Solvent-LHFZ) crystal growth method. This paper discusses the results of these initial experiments, which includes, source material, laser heating, and analysis of the first ever SiC crystals (confirmed by synchrotron white beam x-ray topography)