| 摘要 |
PURPOSE:To improve the capacity of laser beam machining by preventing the generation of a tail in the pulse waveform of a laser when pulses are oscillated and obviating a continuous oscillation state even when the frequency of pulses is high. CONSTITUTION:A discharge excitation type gas laser oscillator is constituted in such a manner that discharge electrodes 1, 3 are arranged oppositely in the direction orthogonal to the direction of flow A of a laser gas and an optical resonance space D, in which an optical resonator by an opposed mirror is extended in the direction orthogonal even to both of the direction of flow of the laser gas and the opposite direction of the discharge electrodes 1, 3, is formed between the discharge electrodes. The optical resonance space D is formed at a position substantially joined with the upstream-side boundary section Ca of the laser-gas flow in a laser-beam gain space C shaped between the discharge electrodes, the substantial presence of the laser-beam gain space C on the upstream side of the laser-gas flow from the optical resonance space D is prevented, and the inflow of excited molecules into the optical resonance space D is obviated after discharge by pulses is completed. |
