&lt;title&gt;High-performance fast-axial-flow radio-frequency discharge-excited CO laser&lt;/title&gt;

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 H20 concentration in the laser gas on the output performance was investigated, and it was found that the H,O 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 ofXe. A maximum output of9IO W was obtained at a laser efficiency of 14.8% with Kr addition, and a maximum output of8IO W was obtained at a laser efficiency of I 6.2% with Xe addition.

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Improved Performance of Fast-Axial-Flow, RF-Discharge-Excited, Room-Temperature CO Laser with Kr-Added Mixtures

Shimizu

Taniwaki

Sato

et al. 2000

Jpn. J. Appl. Phys.

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The fast-axial-flow, RF-discharge-excited, room-temperature CO laser greatly increased the specific output power, from 2.2 W/cm3 (electrical conversion efficiency: 9.5%) in the absence of Kr gas to 3.9 W/cm3 (electrical conversion efficiency: 16.5%), by adding Kr gas to the laser gas. Kr addition is considered to have various effects, including the increase in the vibrational excitation efficiency of CO molecules due to the lowering of mean electron energy, the increase in electron density, and reduction in CO2 concentration due to the decrease in electrically excited CO molecules. Among these effects, the increase in vibrational excitation efficiency and electron density have been found to be significant. The effect is improved up to over 80% of the Xe addition effect.

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<title>High-performance fast-axial-flow radio-frequency discharge-excited CO laser</title>

Cited by 3 publications

References 2 publications

Optimization of operating conditions for a fast-axial-flow, radio frequency discharge-excited, room-temperature CO laser

Optimization of operating conditions for a fast-axial-flow, radio frequency discharge-excited, room-temperature CO laser

High-power room-temperature-operated CO laser

Improved Performance of Fast-Axial-Flow, RF-Discharge-Excited, Room-Temperature CO Laser with Kr-Added Mixtures

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