Growth and Tailoring of Photorefractive Fibers Using the Laser Heated Pedestal Growth Method

2003 ◽  
Author(s):  
William M. Yen
Keyword(s):  
Growth Method ◽  
Laser Heated

Mg-Doped Sapphire Crystal Fibers Grown by Laser-Heated Pedestal Growth Method

2006 ◽  
Vol 45 (1A) ◽  
pp. 194-199 ◽  
Author(s):  
Che-Ming Liu ◽  
Jyh-Chen Chen ◽  
Chang-Hung Chiang ◽  
Long-Jang Hu ◽  
Sheuan-Perng Lin
Keyword(s):  
Sapphire Crystal ◽  
Growth Method ◽  
Crystal Fibers ◽  
Laser Heated ◽  
Mg Doped

Fiber growth of near stoichiometric LiNbO3 single crystals by the laser-heated pedestal growth method

2004 ◽  
Vol 265 (1-2) ◽  
pp. 190-197 ◽  
Author(s):  
K. Nagashio ◽  
A. Watcharapasorn ◽  
R.C. DeMattei ◽  
R.S. Feigelson
Keyword(s):  
Single Crystals ◽  
Fiber Growth ◽  
Growth Method ◽  
Laser Heated

Growth of Single Crystal Yig Fibers by the Laser Heated Pedestal Growth Method

1997 ◽  
Vol 481 ◽  
Author(s):  
HanJin Lim ◽  
R. C. DeMattei ◽  
R. S. Feigelson
Keyword(s):  
Single Crystal ◽  
Growth Rates ◽  
Decomposition Temperature ◽  
Molten Zone ◽  
Nominal Composition ◽  
Vis Spectroscopy ◽  
Growth Method ◽  
Crystal Fibers ◽  
Iron Garnet ◽  
Laser Heated

ABSTRACTYttrium iron garnet (YIG) single crystal fibers of nominal composition Y3Fe5O12 were grown by the laser heated pedestal growth (LHPG) technique, a miniaturized floated-zone process. YIG which melts incongruently, was grown at a temperature below the peritectic decomposition temperature under self-adjusting conditions even though it has very narrow solidification region according to the Y2O3-Fe2O3 phase diagram. YIG fibers in diameter ranges from 100 to 750 μm were grown at various growth rates and conditions, and analyzed by x-ray diffraction, electron microprobe, and IR-VIS spectroscopy. Infrared transparent YIG fibers were grown at rates below 12 mm/h in air. At these growth rates, yttrium orthoferrite and iron-oxide inclusions within the YIG fiber, which act as IR scattering centers, were significantly reduced. The transparency of the fibers was more dependent on the growth rate than the stability of the molten zone. Surface ridges containing an Fe-rich composition were observed at all growth rates. These were associated with molten zone instability.

scholarly journals Characterization of 4H Silicon Carbide Films Grown by Solvent-Laser Heated Floating Zone

2012 ◽  
Vol 1433 ◽  
Author(s):  
Andrew A. Woodworth ◽  
Ali Sayir ◽  
Philip G. Neudeck ◽  
Balaji Raghothamachar ◽  
Michael Dudley
Keyword(s):  
Silicon Carbide ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Growth Front ◽  
Electrical Performance ◽  
Floating Zone ◽  
X Ray ◽  
Growth Method ◽  
Laser Heated

ABSTRACTCommercially available bulk silicon carbide (SiC) has a high number (>2000/cm2) of screw dislocations (SD) that have been linked to degradation of high-field power device electrical performance properties. Researchers at the NASA Glenn Research Center have proposed a method to mass-produce significantly higher quality bulk SiC. In order for this bulk growth method to become reality, growth of long single crystal SiC fibers must first be achieved. Therefore, a new growth method, Solvent-Laser Heated Floating Zone (Solvent-LHFZ), has been implemented. While some of the initial Solvent-LHFZ results have recently been reported, this paper focuses on further characterization of grown crystals and their growth fronts. To this end, secondary ion mass spectroscopy (SIMS) depth profiles, cross section analysis by focused ion beam (FIB) milling and mechanical polishing, and orientation and structural characterization by X-ray transmission Laue diffraction patterns and X-ray topography were used. Results paint a picture of a chaotic growth front, with Fe incorporation dependant on C concentration.

Growth And Characterization Of Nickel-Doped Garnets By The Laser-Heated Pedestal Growth Method

1989 ◽  
Author(s):  
L. M. .. Thomas ◽  
D. M. Andrauskas ◽  
H. R. Verdun
Keyword(s):  
Growth Method ◽  
Laser Heated

Growth of lithium triborate (LBO) single crystal fiber by the laser-heated pedestal growth method

1991 ◽  
Vol 112 (1) ◽  
pp. 283-286 ◽  
Author(s):  
Ji Yangyang ◽  
Zhao Shuqing ◽  
Huo Yujing ◽  
Zhang Hongwu ◽  
Li Ming ◽  
...  
Keyword(s):  
Single Crystal ◽  
Lithium Triborate ◽  
Crystal Fiber ◽  
Growth Method ◽  
Laser Heated

Structure of superconducting fibers prepared by laser-heated pedestal growth method

1990 ◽  
Vol 48 (4) ◽  
pp. 30-31
Author(s):  
L.Y. Cai ◽  
Y.J. Huo ◽  
S.N. Mao ◽  
M.L. Liu ◽  
F.H. Li
Keyword(s):  
Critical Current Density ◽  
Laser Beam ◽  
Critical Current ◽  
Transition Region ◽  
Current Density ◽  
Raw Material ◽  
Molten Zone ◽  
Growth Method ◽  
Laser Heated ◽  
Critical Current Density Jc

Superconducting fibers have drawn great attention because of the latent prospect for applications. Fibers of superior quality were obtained by means of the laser-heated pedestal growth (LHPG) method. For LHPG method a fine laser beam is focused at the “source rod” made of raw material so that a small molten zone is formed on its upper end. Then a seed crystal is introduced into the melt and drawn from it to grow crystalline fibers. In this paper the structure of bismuth based Bi-Sr-Ca-Cu-O and Bi-Pb-Sr-Ca-Cu-O superconducting fibers prepared by LHPG is reported. The values of Tc for the two kinds of fibers are 85k and 108k respectively. The critical current density Jc can reach 5150A/cm2. The diameters of fibers are ranged from 35μm-200μm. The thin fibers are flexible.Fig.1 shows the transition region between the source rod (R) and the LHPG fiber (G). It indicates that the source crystal first melts and then recrystallizes along a certain cry stenographic direction.

Sign in / Sign up

Export Citation Format

Share Document