1280389-A is referenced by 2 patents.
1280389 Crystal growing CARL-ZEISSSTIFTUNG grading as JENAER GLASWERK SCHOTT & GEN] 2 Nov 1970 [3 Nov 1969] 52075/70 Heading BIS [Also in Division C1] In the production of crystalline material, the crystal forming substance 4 in finely divided form is melted by a laser beam 1, of a wave length greater than 2.5 Ám, at the focal point 5 and cooled on a support 6 which is progressively lowered to form a rod of crystalline material. The laser beam 1 is passed through a horizontal convex cylinder lens 2 to reduce the vertical width of the beam and through a vertical concave cylinder lens 3 to increase the width of the beam in a horizontal direction, the lenses being e.g. of NaCl or germanium. The laser beam 1 is preferably a CO 2 gas laser having a wave length of 10.6 Ám.; The crystalline rod can also be pulled one or more times through the laser beam to utilise the effect of the known zone-melting method.