| 摘要 |
PURPOSE:To decrease short-time variation of laser outputs and beam modes and to obtain a laser device having a high working accuracy, by providing a discharging section outlet having a profile enlarged progressively on the end face of the discharge tube. CONSTITUTION:A high-speed, axial-flow-type laser device in which gas flows in the same direction with that of the optical axis comprises a discharge tube 2a within which the gas is circulated at a high speed of 100m/s or over. The discharge tube 2a is provided with an discharging section outlet 100 on the end face thereof. The outlet 100 has a profile enlarge progressively, while an angle of enlargement is preferably 10 deg. or below. In a case of a silent discharge excitation CO2 laser, for example, metal electrodes 30 and 40 are connected to the periphery of the discharge tube 2a through an AC power supply 140 so that silent discharge is caused within the discharge tube 2a to excite a laser medium. Further, a diffuser 100 is provided at the outlet of the discharge tube in order to stabilize the gas flow. A laser beam is reflected reciprocally between reflecting mirrors 10 and 11 while it is partially transmitted through one of the reflecting mirrors so as to perforate an iron plate or the like. |
