Effects of Cs and Ag metal vapor additives on the lasing performance of a HyBrID copper vapor laser have been experimentally investigated. By adding Cs to the discharge plasma of the laser, the optimum HBr gas flow rate is changed to be smaller than that without the additives. And the average output power increases by about 20. With the addition of Ag, the output power increases by 30. And the output power characteristics at high-pulse repetition frequency from 16 to 20 kHz are improved. Based on a relaxation of the laser lower level of Cu atoms in the metastable state and a reduction in the remanent free electron density in the interpulse period, the mechanisms for the remarkable improvement are discussed.
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