device for separation of a ljusstrale in numerous rays of the rising sun or omvent

摘要

PCT No. PCT/SE81/00156 Sec. 371 Date Jan. 26, 1982 Sec. 102(e) Date Jan. 26, 1982 PCT Filed May 26, 1981 PCT Pub. No. WO81/03551 PCT Pub. Date Dec. 10, 1981.A device for dividing a laser beam, e.g. into parallel equidistant beams includes a glass plate with two opposing planer, parallel surfaces. A transmission grating is arranged on one glass surface. A reflecting layer is applied over the grating, and an opening is arranged in the layer at half the length of the plate, for taking the beam, which is to be divided, to and through the grating. The laser wavelength and the grating line density are selected to give total reflection at the free surface of the glass for a beam diffracted at the opening of the grating. By altering the angle of incidence of the beam, the distance between the subdivided beams can be continuously varied within given limits. The device is also utilizable for combining a plurality of separate beams into a single beam. (FIG. 3).