The operation of a new type CO chemical laser has been demonstrated in which a chain reaction is initiated by ac discharge through O2 discharge tubes and the laser cavity. The chain reaction with CS/O2 as the fuel/oxidizer,and O and S atoms as the chain carriers, is thought to be the basis of the operation. Gain and power measurements have been made and small-signal gains of 1.1%/cm for both P8(18) and P6(17) have been observed 7.5 mm downstream from the CS2 transverse injectors. Laser oscillation has been observed directly below the CS2 transverse injectors.
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