A kind of laser-induced cadmium tungstate crystal growth method

Abstract

An embodiment of the invention provides a laser induced cadmium tungstate crystal growing method. The laser induced cadmium tungstate crystal growing method comprises the following steps: placing CdWO4 seed crystal at the lower end of a crucible, and filling the crucible with a CdWO4 polycrystal material; placing the crucible in a ceramic tube, filling a gap between the crucible and the ceramic tube with Al2O3 powder, and placing the ceramic tube on a lifting table in a furnace body of a heating furnace; heating the furnace body to a set temperature, and carrying out welding of the seed crystal before growth of crystal; enabling the lifting table to fall, and meanwhile, radiating a solid-liquid interface by laser; and after growth of the crystal is finished, reducing the temperature of the furnace to room temperature, and stripping the crystal from the crucible to obtain CdWO4 single crystal. The CdWO4 crystal grows by a Bridgman-Stockbarger method, during growth of the crystal, the laser irradiates the solid-liquid interface between the growing crystal and melt to carry out induction, stable growth of the CdWO4 crystal is realized, the uniform and transparent CdWO4 single crystal can be obtained, and the single crystal has good optical quality.

Description

technical field [0001] The invention belongs to the technical field of crystal growth, in particular to a cadmium tungstate (CdWO) induced by laser irradiation. 4 ) method of crystal growth. Background technique [0002] Scintillation crystal is a photoelectric functional material, which refers to a material that can emit pulsed light under the action of high-energy particles or rays (such as X-rays, γ-rays, etc.). As the core part of scintillation detectors, scintillation crystals are usually used to detect the quantity, energy and direction of high-energy radiation particles such as high-energy charged particles, X-rays, gamma-rays and neutrons. [0003] As a very important inorganic scintillation crystal, cadmium tungstate has excellent scintillation properties, especially its large absorption coefficient for X-rays (at 150keV, the line absorption coefficient can reach 7.68cm -1 ), short radiation length (1.0cm), and strong anti-damage performance, so it has become the ...

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Problems solved by technology

[0005] In order to solve the problem of poor uniformity of cadmium tungstate crystal growth in the prior art, the present invention provides a laser-induced cadmium tungstate crystal growth method. On the basis of using the traditional crucible drop method to grow cadmium tungstate crystals, the laser is introduced as an induction method. source to achieve uniform growth of cadmium tungstate crystals

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