Crystal growth control method and apparatus, and crystal growth device

A crystal-growth controlling method, a cross section of at least part of grown crystal having a predetermined shape, wherein the crystal-growth controlling method comprises:

• in a process of growing a crystal by a pulling method, acquiring a growth image of the crystal in real time, and extracting shape information of the crystal at a growth interface from the growth image, wherein the growth interface is where the crystal intersects with a raw-material melt liquid level;
• comparing the shape information of the crystal at the growth interface with shape information of the predetermined shape, to obtain a comparison result;
• and
• based on the comparison result, adjusting a shape of the crystal at the growth interface by using a laser;
• wherein in the process of growing the crystal by the pulling method, the crystal rotates in a first direction relatively to the raw-material melt, and when the shape of the crystal at the growth interface is adjusted by using the laser, a laser light emitted by the laser irradiates the growth interface of the crystal;
• wherein in the process of growing the crystal by the pulling method, the crystal has a first contour at the growth interface;
• the predetermined shape has a second contour;
• and
• the step of, based on the comparison result, adjusting the shape of the crystal at the growth interface by using the laser comprises:
• based on the comparison result, controlling the laser to irradiate the growth interface of the crystal in a laser-light movement path, to adjust the shape of the crystal at the growth interface by using the laser, wherein the laser-light movement path is between the first contour and the second contour in a radial direction of the crystal at the growth interface.