使用两台相同的望远镜式非稳腔铜蒸气激光器,通过一块45°玻璃平板作腔的耦合组成匹配的注入锁定系统,研究了同步、注入信号功率和光束孔径大小等因素对输出功率和方向性的影响,实验结果清楚地表明,注入信号的作用在于抑制腔内高阶横模(包括被放大的自发发射)的竞争,使高增益介质的激光器既提高效率又改善方向性。注入锁定器件功率水平在5左右的情况下,其结果与单独非稳腔振荡相比,输出功率增加30～40％,方向性改善一倍以上。

This paper presents a study on the influences of timing, injected signal power and injected beam diameter upon the output power and divergency of a injection locking system, which is composed of two similar telescope unstable OVL with a 45° glass plate inside of one laser as coupling optics. The results showed that the injected signal strongly suppressed the competition of high order transverse modes (including ASE) in cavity, then led to raise the efficiency and to improve the divergency simutaneously. In the case of output power about 5W, the injootion locked system raised the power by 30%~40% and reduced the divergency to half, compared with the independent unstable reaonator.