A multipath cell using a modified White mirror system has been operated as an amplifier and as an oscillator at the 10.6-µ CO2 transition of the CO2-N2 gas laser. An oscillator tube efficiency of 33% and an amplifier power gain of 8.7 have been obtained. With a specific gas mixture, the amplifier saturated output power is approximately one-half that of the maximum oscillator output.
George J. Dezenberg and James A. Merritt, "The Use of a Multipath Cell as a CO2-N Gas Laser Amplifier and Oscillator," Appl. Opt. 6, 1541-1543 (1967)