目前人们已在光折变晶体中实现了多种形式的光学相位共轭。其中自泵浦相位共轭的实现尤其引人注目,在诸多类型的自泵浦相位共轭器中,环行腔式相位共轭器由于同时具有阈值低和自启动的两项优点而更具吸引力。这种器件主要有两种形式:外腔式和内反射式。在理论处理中均假定腔中的相向损耗相同,实际上内反射式器件会因光束在晶体中的相向二波耦合导致透过率的非对称,而外腔式器件也会因其他光学元件的置入形成损耗的不对称。在原有理论的基础上,我们考虑了双向透过率非对称性得到了器件性能与这种 At present, many forms of optical phase conjugation have been realized in photorefractive crystals. Of particular interest is the realization of self-pumping phase conjugation, which is more attractive in many types of self-pumping phase conjugators due to the combination of both low threshold and self-starting advantages force. This device has two main forms: external cavity and internal reflection. In the theoretical treatment are assumed that the cavity of the same loss, in fact, the internal reflection of the device due to the beam in the crystal two-wave coupling caused by asymmetry of transmittance, and cavity devices will be due to other optical components Into the formation of loss of asymmetry. Based on the original theory, we consider the bidirectional transmittance asymmetry and obtain the performance of the device