Study of atomic Ne penning laser for photodynamic therapy of cancer

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The atomic neon penning laser for photodynamic therapy of cancer is studied experimentally and theoretically. As a result, the following results are obtained :(1)Using a neon penning laser code developed by us, the operational conditions for achieving high energy output and high efficiency are made clear.(2)It is found that the optimun gas mixture is Ne/H_2=16/40 Torr and the optimum pumping rate is 0.5 MW/cm^3. At this parameter the output power density of 4.4 W/cm^3 is obtained at an efficiency of 8.5x10^<-6>.(3)At higher pump rates than 0.5 MW/cm^3, deactivation of the upper laser level by discharge electron becomes larger, resulting in the decrease of the efficiency.(4)Achievement of the stable discharge leads to the klowatt-class neon laser.(5)As a penning partner of the neon laser, H_2 is better than D_2.(6)By delivering the neon laser pulse through the quarts fiber, HpD is efficiently pumped.