Longitudinally excited CO2 laser with tail-free short pulse

Kazuyuki Uno; Kazuma Dobashi; Tetsuya Akitsu; Takahisa Jitsuno

doi:10.1117/12.2071059

18 November 2014 Longitudinally excited CO₂ laser with tail-free short pulse

Kazuyuki Uno, Kazuma Dobashi, Tetsuya Akitsu, Takahisa Jitsuno

Proceedings Volume 9266, High-Power Lasers and Applications VII; 92661U (2014) https://doi.org/10.1117/12.2071059
Event: SPIE/COS Photonics Asia, 2014, Beijing, China

Abstract

We developed a longitudinally excited CO2 laser with a tail-free short laser pulse. In a discharge tube, two structures were researched. One is a shingle scheme that is constituted of a 45 cm-long discharge tube. Another is a tandem that is constituted of two 30 cm-long discharge tubes connected with an intermediate electrode were used. In gas media, CO₂- rich mixture (CO₂: N₂= 20: 1) was used to reduce a laser pulse tail. The laser system did not require expensive and scarce helium. A fast discharge (<1 μs) in a low gas pressure (<1.8 kPa) produced a tail-free laser pulse with the pulse width of about 100 ns. The single scheme produced an output energy of 4.7 mJ by a charging voltage of -36.3 kV, and the tandem scheme produced an output energy of 9.3 mJ by a charging voltage of -25.2 kV. The tandem scheme produced higher spike pulse by lower voltage than the single scheme. Therefore, the tandem scheme will be effective in longitudinally excited CO₂ lasers with simple and compact designs.

Citation Download Citation

Kazuyuki Uno, Kazuma Dobashi, Tetsuya Akitsu, and Takahisa Jitsuno "Longitudinally excited CO₂ laser with tail-free short pulse", Proc. SPIE 9266, High-Power Lasers and Applications VII, 92661U (18 November 2014); https://doi.org/10.1117/12.2071059

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