Numerical Simulation Of Crystal Growth Temperature Field By Optical Floating Zone Method

This paper combines numerical simulation and actual growth experiments, compiled a set of simulation program for optical floating zone crystal growth temperature field. Using the floating zone growth out of the good quality of TiO₂ crystal and SBN crystal by simulation results.First, establishing the mathematical model of optical floating zone growth temperature, after that, the physical parameters of the growth material of the halogen lamp are measured, and finishing the boundary conditions of the mathematical model. Making the temperature field simulation of the growth process of filament size and growth power percentage, melting zone shape, preform radius, thermal conductivity and other parameters. Finally it is concluded that the main parameters affecting the growth of TiO₂ and SBN crystals are the filament thickness, the percentage of the growth power and the diameter of the preform. Two crystals are suitable for the use of 1000 W halogen lamps growth, the growth of TiO₂ needs power percentage of 72%, SBN crystal growth needs power percentage of 48%, SBN crystal preform diameter 5mm and TiO₂ Crystal preform diameter of 8mm,the crystal quality is best.For optical floating zone method experiment of TiO₂ and SBN crystal growth, using a simulation program to determine the approximate range of the parameters, using different process parameters of growth, Measurement of the growth of the crystal quality, and the simulation results, and ultimately determine the optimal process parameters, the TiO₂ Crystal process parameters of the best is: 1000 W halogen lamp filament thickness of 3mm), preform rod with a diameter of 8mm, growth power percentage of 73%, 20 R / min rotational speed; the SBN crystal process parameters of the best: 1000 W halogen lamp filament thickness of 3mm), preform rod with a diameter of 5mm, the growth percentage of 48% power, rotation speed of 20 R / min. Through the experiment and the theory combined perfect simulation program so that it can more accurately simulate optical floating zone melting zone temperature field distribution and the process parameters can be simulated. In the future growth of different types of crystal in the laboratory to provide help and guidance.