High-power room-temperature-operated CO laser

Kouki Shimizu; Manabu Taniwaki; Shunichi Sato; Mikio Kumagai; Yoich Takashima; Yasuhiro Naito; Hiroshi Nagano; Toru Hasuike

doi:10.1117/12.380915

3 April 2000 High-power room-temperature-operated CO laser

Kouki Shimizu, Manabu Taniwaki, Shunichi Sato, Mikio Kumagai, Yoich Takashima, Yasuhiro Naito, Hiroshi Nagano, Toru Hasuike

Author Affiliations +

Proceedings Volume 3889, Advanced High-Power Lasers; (2000) https://doi.org/10.1117/12.380915
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan

Abstract

The objectives of this study are to achieve high-power, efficient operation of a room-temperature CO laser and to collect data for designing the CO laser system for nuclear reactor decommissioning. The influence of the H₂O concentration in the laser gas on the output performance was investigated, and it was found that the H₂O concentration should be kept as low as possible (less than 260 ppm) to obtain stable, high-power outputs. To improve output performance, the rf frequency was increased from 13.56 MHz to 27.12 MHz. The output power for the 27.12 MHz excitation was increased by 10 to 20% compared with that for the 13.56 MHz excitation. The laser output was scaled by extending the discharge tube inner diameter from 19 mm to 30 mm. By optimizing the air gap length and the curvature radius of the outer metallic electrode, the operating gas conditions, and the reflectivity of the output coupler, a maximum output of 830 W was obtained at a laser efficiency of 12.2% with adding neither Kr nor Xe. The addition of Kr was more effective for increasing the output than the addition of Xe. A maximum output of 910 W was obtained at a laser efficiency of 14.8% with Kr addition, and a maximum output of 810 W was obtained at a laser efficiency of 16.2% with Xe addition.

Citation Download Citation

Kouki Shimizu, Manabu Taniwaki, Shunichi Sato, Mikio Kumagai, Yoich Takashima, Yasuhiro Naito, Hiroshi Nagano, and Toru Hasuike "High-power room-temperature-operated CO laser", Proc. SPIE 3889, Advanced High-Power Lasers, (3 April 2000); https://doi.org/10.1117/12.380915

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