| 摘要 |
PURPOSE:To form the titled tube of inside mirror type which is excellent in impact resistance and economical property and firmly holds a Brewster window without damaging optical characteristics by a method wherein a pair of U- shaped members having a cut-out in recess form is provided in such a manner that a glass plate is sandwiched by fitting at a Brewster angle. CONSTITUTION:A U-shaped plate member 10' is welded to the inner projection 14 of a sealed tray 9 fitted to the left end of a laser tube casing 4, and next the glass plate 1 and a U-shaped plate member 10 are incorporated in this order. Further, a mirror 2 is inserted and then joined to the tray 9 at high temperature with a low melting point glass 3. At this time, the glass plate 1 is sandwiched between the plate members 10 and 10' by the cuts 11, since the metallic sealed tray 9 has a higher rate of heat shrinkage than the plate members 10 and 10'. Besides, the glass plate 1 is only in wire contact with the upper end and lower end except the center; therefore the inner strain of the glass plate diminishes, resulting in the improvement of output and the characteristic of polarization degree. Then, the glass plate 1 can be mounted along the cut-out 11 in the working of glass plate incorporation; accordingly the workability extremely improves. |
