unidirectional ring

The experiment of MOPA ( Master Oscillator Power Amplifier) laser system with an optical fiber as the phase conjugate mirror is reported. The laser beam from the unidirectional ring resonator was amplified and then coupled in a optical fiber to get the phase conjugate beam.

介绍了采用光纤作为位相共轭镜应用于MOPA（Master-Oscillator-Power-Amplifier）系统的初步实验，利用单向环形腔振荡器输出并经一级放大，将放大后输出激光耦合到光纤中获得了位相共轭激光输出。

For the exactly soluble case of unidirectional ring laser with a homogeneous broadened line, the frequency shift relation, the critical and threshold value of inversion, the phase transition behavior and the features of the two-photon lasers with injected signal are analysed.

就可以精确求解的均匀展宽、单向环形激光器的情形，分析了频率位移关系，反转度的临界值和阈值，相变行为，以及带有外加讯号的双光子激光的特性。