| 摘要 |
PURPOSE:To obtain a laser beam intensity distribution of a good quality, by forming a black alumite processing layer for absorbing infrared rays on the surface of a slit for generating a spiral flow which is provided on the upstream of the laser gas of a cathode, and by forming the black alumite processing layer on the surface of a connection member by which the slit and the cathode are connected. CONSTITUTION:A slit 18 and a connection member 19 are formed with aluminum or an alloy thereof, and on their respective surfaces black alumite processing layers 20 are so formed as to absorb infrared rays. When a discharge is generated in a discharge tube 1 and a laser gas is circulated, a laser beam is generated in the axial direction of the discharge tube 1. The slit 18 and the connection member 19 absorb a scattered light in an optical resonance section, because by the black alumite processing layers 20 on their surfaces infrared rays are absorbed. Thereby, a laser beam intensity distribution accompanied by no scattered light is obtained. |
