In this paper,a two-dimensional model was established in the rectangular co-ordinate using the software of Ansys to study the distribution of the thermal stress in the bulk sapphire crystal with dimension Φ230x200mm,grown by the improved Kyropoulos method.
With the output power of microwave irradiation controlled by Fuzzy-PID controller, the temperature, measured by sapphire single crystal optical fiber temperature sensor, was controlled very precision.
The microwave irradiation multi-phase catalysis reaction system on sapphire single crystal optical fiber temperature sensor, including microwave irradiation subsystem, automatic control subsystem and product analysis subsystem, was introduced in this paper.
With the help of LHPG(laser heated pedestal growth) device made by ourselves, the growing characteristics and properties of sapphire single crystal fiber for high temperature sensor are studied in this paper.
Sapphire single crystal fibers (diameter 200 ̄1000μm,length 10 ̄50cm) were grown by the laser heated pedestal growth method. The transmission and scattering losses for such kinds of fibers were analyzed and measured. The results show that the sapphire fibers have excellent optical transmission properties in visible and near infrared region of the spectrum, and can be used for medical transmission systems and high temperature sensor applications.
WT5”BZ]:In order to facilitate the medical laser transmission,in this paper,weve plastically bent two groups of sapphire fibers with diameters of 550 μm and 750 μm by means of CO 2 lasers,the average bending radius is 3.0 mm,the additional loss caused by a single bend is less than 0.1 dB at 900 nm,the damage threshold is higher than 30 MW/cm 2 for Nd:YAG laser pulses.
For the commonly used window materials of LiF and sapphire, we always confront the trouble of rattier large impedance and temperature mismatching situations aross sample/window interface if the sample is with intermediate impedance (say p0~7.0 g/cm3) because under such condition large error would be introduced in data processing.
The experimentally determined abnormally high intensity of the antistatic wing is explained by the effect of phase relaxation of the atomic transition, caused by fluctuations of the electric field of oscillating ions of the sapphire crystal lattice.
By accurately balancing the intracavity dispersions between Ti:sapphire crystal, air and chirped mirrors, we directly generated the laser pulse shorter than 7 fs at the average power of 340 mW with 3.1 W pump.
In this paper, we report the fabrication of higher-order-mode rejected fiber Bragg gratings (FBGs) in sapphire crystal fiber using infrared (IR) femtosecond laser illumination.
Highly oriented lead lanthanum titanate (PLT) thin films on MgO (100) and c-plane sapphire single-crystal substrates have been prepared using the sol-gel process.
We discuss the use of sapphire single crystal as a thermal neutron filter in terms of the optimum cystal thickness, mosaic spread, temperature, cutting plane and tuning for efficient transmission of thermal-reactor neutrons.
With the help of LHPG(laser heated pedestal growth) device made by ourselves, the growing characteristics and properties of sapphire single crystal fiber for high temperature sensor are studied in this paper. The results show the properties of sapphire single crystal fiber are determined by its growing technological process, the best growing tectnological parameters for sapphire single crystal fiber are given in this paper.
This paper describes the operational principle and the fabrication method of sapphire high-temperature optical-fiber sensor.We have proved practiclly and theoretically that this sensor has a wider operation range ( up to 2000℃) and higher accuracy than other thermometers. The experimental results have showed that it has a temperature accuracy of 0.1% at 1000℃.
In recent years, one of achievements in fields of sophisticated technology is the sapphires single-trystal fiber-optic high-temperature. The principle and radiation characteristics of the probe are theoretically introduced in this aprep.The basic parameters for design of the probe, which approximates an ideal blackbody in a state of radiation, are presented. The experiment results are in good agreement with that of the theoreticul analysis.