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Proceedings Paper

Longitudinally excited CO2 laser with short laser pulse operating at high repetition rate
Author(s): Jianhui Li; Kazuyuki Uno; Tetsuya Akitsu; Takahisa Jitsuno
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Paper Abstract

A short-pulse longitudinally excited CO2 laser operating at a high repetition rate was developed. The discharge tube was made of a 45 cm-long or 60 cm-long dielectric tube with an inner diameter of 16 mm and two metallic electrodes at the ends of the tube. The optical cavity was formed by a ZnSe output coupler with a reflectivity of 85% and a high-reflection mirror. Mixed gas (CO2:N2:He = 1:1:2) was flowed into the discharge tube. A high voltage of about 33 kV with a rise time of about 200 ns was applied to the discharge tube. At a repetition rate of 300 Hz and a gas pressure of 3.4 kPa, the 45 cm-long discharge tube produced a short laser pulse with a laser pulse energy of 17.5 mJ, a spike pulse energy of 0.2 mJ, a spike width of 153 ns, and a pulse tail length of 90 μs. The output power was 5.3 W. The laser pulse waveform did not depend on the repetition rate, but the laser beam profile did. At a low repetition rate of less than 50 Hz, the laser beam had a doughnut-like shape. However, at a high repetition rate of more than 150 Hz, the discharge concentrated at the center of the discharge tube, and the intensity at the center of the laser beam was higher. The laser beam profile depended on the distribution of the discharge. An output power of 7.0 W was achieved by using the 60 cm-long tube.

Paper Details

Date Published: 9 November 2016
PDF: 6 pages
Proc. SPIE 10016, High-Power Lasers and Applications VIII, 100161G (9 November 2016); doi: 10.1117/12.2245529
Show Author Affiliations
Jianhui Li, Univ. of Yamanashi (Japan)
Kazuyuki Uno, Univ. of Yamanashi (Japan)
Tetsuya Akitsu, Univ. of Yamanashi (Japan)
Takahisa Jitsuno, Osaka Univ. (Japan)


Published in SPIE Proceedings Vol. 10016:
High-Power Lasers and Applications VIII
Ruxin Li; Upendra N. Singh; Robert F. Walter, Editor(s)

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