| 摘要 |
PURPOSE:To reduce the number of dusts attaching to a total reflection mirror and a partial reflection mirror, to realize a long life and to reduce a maintenance cost by supplying purging gus and by sucking and exhausting it through a vacuum pump. CONSTITUTION:A blower 2 for laser medium circulation is made to rotate as clean gas such as N2 is fed into an oscillator box body 1 from a purging gas path 11b. A lashing flow of N2 gas is produced then inside the oscillator box body 1, and dusts stored inside the oscillator box body 1 and dusts attaching to surfaces of a total reflection mirror 4 and a partial reflecting mirror 5 flat and circulate inside the oscillator box body 1 together with the fed N2 gas. This operation is carried out for a fixed time to eliminate almost all the dust inside the oscillator box body 1, and the oscillator 1 is always kept clean. Dusts attaching to the total reflection mirror 4 and the partial reflection mirror 5 can be thereby reduced, thus resulting in an improved life and reduction of a maintenance cost. |
