[15a-PB01-1~7] 3.4 Laser system and materials (formerly 3.5)

[15a-PB01-2] Development of longitudinally excited CO₂ laser without He gas

〇Ryo Okawa¹, Kazuyuki Uno¹, Shohei Watarai², Yasushi Kodama^1,2, Kazuyuki Yoneya² (1.Yamanashi Univ., 2.Seidensha Electronics)

Keywords:CO2 laser, Longitudinal discharge, Low-pressure gas discharge

In this work, we have developed a longitudinally excited He-free CO₂ laser that does not require a pre-ionization device. A short-pulse with a laser energy of 32.5 mJ was produced at a repetition rate of 300 Hz with a gas mixture ratio of CO₂:N₂=1:2 at 2.0 kPa in a discharge tube with an inner diameter of 8 mm and a length of 80 cm. In addition, a discharge tube with an inner diameter of 8 mm could provide practical energy at repetition rates 300 Hz or less, even with He-free gas.