| 摘要 |
PURPOSE:To enable the attainment of laser beams whose intensity distribution both in the direction of an electric field and in the direction perpendicular to the above direction forms a trapezoid, by a method wherein a concavity extending in the longitudinal direction of a discharge surface of at least either one of paired main discharge electrodes is provided in said surface. CONSTITUTION:In a discharge-type laser in which laser beams are obtained by the discharge between main discharge electrodes in a pair or more, a concavity extending in the longitudinal direction of a discharge surface at least either one of paired main discharge electrode 12 and 13 is provided in said surface. For instance, indents 12b and 13b as the concavities are formed in the central portions of the discharge surfaces 12a and 13a of the paired main discharge electrodes 12 and 13, along the longitudinal direction thereof, so that a space between the paired main discharge electrodes 12 and 13 is varied. That is, the space is made to be the largest between the indents 12b and 13b, to be smaller gradually as it is farther to the right and left from the indents, and to be the smallest between two pairs of top portions 12c and 13c, and 12d and 13d, which are formed on the right and left sides of the indents 12b and 13b. |
