The resonance enhancement of an optoacoustic signal is used to obtain a reliable discriminator in order to stabilize the output frequency of a CO2laser. The CO2laser is maintained on the 9P(36) emission line, the methyl alcohol vapor pressure within the acoustic cell is maintained at a valuepg=1 Torr, and the chopper frequency is fixed at the fundamental longitudinal resonant frequency of the cylindrical resonator throughout the experiment. Utilizing a back electret condenser microphone to detect the optoacoustic signal, a reliable discriminator is obtained for a value of pump power as low as 10 mW.
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