A second-harmonic of a copper vapor laser whichis output from an oscillatoramplifer system with a self-fliering unstable resonator is generated in BBO crystal by a line focus. The conversion efficiency reached 14. 4% at 5. 4 W fundamental power.

• 通过线聚焦将自滤波振荡行波放大后的铜激光在BBO晶体中信频，当基频光功率为5.；4W时，倍频效率达14