| 摘要 |
The essence of the invention resides in the creation of a laser beam of a flat planar cross section. This function is accomplished by providing a dual surface concave lens and two parabolic reflection mirrors having predetermined focal points in a laser medium within a generally cylindrical tube. The tube is provided with a mirror at each end thereof and a lens having two concave surfaces is disposed in the approximate center of the tube. A medium is provided within the tube which permits the transmission of the laser beam therein and excitation means in communication with said medium for exciting the same.
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