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

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