| 摘要 |
<p>A device for dividing a laser beam (1), e.g. into parallel equidistant beams (12) includes a glass plate (2) with two opposing planar, parallel surfaces. A transmission grating (3) is arranged on one glass surface. A reflecting layer (4) is applied over the grating (3), and an opening (5) is arranged in the layer (4) at half the length of the plate, for taking the beam (1), which is to be divided, to and through the grating. The laser wave-length and the grating line density are selected to give total reflection at the free surface of the glass for a beam (11) diffracted at the opening (5) of the grating (3). By altering the angle of incidence //c of the beam (1), the distance a 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.</p> |
