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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