Investigations on creation of a high-power and high-efficiency copper bromide vapor laser (CuBrVL) (lambda 510.6, 578.2 nm) are reported. Laser generation of 100 W output power was achieved at 3% efficiency (based on stored energy). These output power and efficiency figures are record values for copper bromide lasers. The device produced maximum output power at a PRF of 17.5 kHz. Laser operating characteristics and electrical parameters are described.