| 摘要 |
PURPOSE:To improve light condensing characteristics by a method wherein a partially transmitting part is provided on the exit mirror of a resonator and two parts of a laser beam which are reflected by the partially transmitting part and its circumferential part of the exit mirror respectively are taken outside while their mutual phase difference is cancelled. CONSTITUTION:A laser beam 7a magnified by a magnifying totally reflective mirror 1a is amplified by a laser medium 3. A part of its center part is taken outside through the partially reflective film 20 of an exit mirror 4 and all its circumferential part is taken outside through the non-reflective film 5 of the exit mirror 5. The two parts are synthesized to form an equal phase and solid high quality laser beam 8. A laser beam 7 partially reflected by the partially reflective mirror 20 is again amplified by the laser medium 3 and further reflected and magnified by the magnifying totally reflective mirror 1a. Thus, every time the laser beam 7 goes back and forth in a laser resonator composed of the magnifying totally reflective mirror 1a, and the exit mirror 4, the solid high quality laser beam 8 is emitted outside. With this constitution, a high quality laser beam can be taken out without degrading an oscillation efficiency. |
