| 摘要 |
PURPOSE:To prepare a crystal with a low-power laser beam in high efficiency, by covering the raw material of crystal with an optically transparent covering material in a spherical form, enclosing the sphere with concave mirrors provided with windows at definite intervals, and heating and melting the crystal raw material with laser beams introduced through the windows. CONSTITUTION:The raw material of crystal 1 is covered with a covering material 2 made of a transparent substance such as glass in the form of a sphere, which is enclosed with concave mirrors 6 provided with windows at definite intervals. The material 1 is heated and molten by introducing laser beams 3 through the windows 5. The radiant heat emitting from the sphere in the form of heat ray 4 by the heating of the material 1 is mostly reflected by the concave mirror 6 and focused again to the material 1. Accordingly, the radiation loss can be remarkably suppressed, and the power of the laser beam 3 can be considerably lowered by this method. After melting, the radiation of the light 3 is stopped, and the material 1 is cooled to obtain a crystal such as diamond crystal. |
