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Proceedings Paper

High-power room-temperature-operated CO laser
Author(s): Kouki Shimizu; Manabu Taniwaki; Shunichi Sato; Mikio Kumagai; Yoich Takashima; Yasuhiro Naito; Hiroshi Nagano; Toru Hasuike
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Paper 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.

Paper Details

Date Published: 3 April 2000
PDF: 5 pages
Proc. SPIE 3889, Advanced High-Power Lasers, (3 April 2000); doi: 10.1117/12.380915
Show Author Affiliations
Kouki Shimizu, Institute of Research and Innovation (Japan)
Manabu Taniwaki, Institute of Research and Innovation (Japan)
Shunichi Sato, Institute of Research and Innovation (Japan)
Mikio Kumagai, Institute of Research and Innovation (Japan)
Yoich Takashima, Institute of Research and Innovation (Japan)
Yasuhiro Naito, Tokyo Electric Power Co. (Japan)
Hiroshi Nagano, Tokyo Electric Power Co. (Japan)
Toru Hasuike, Tokyo Electric Power Co. (Japan)


Published in SPIE Proceedings Vol. 3889:
Advanced High-Power Lasers
Marek Osinski; Howard T. Powell; Koichi Toyoda, Editor(s)

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