The concept of the twisted-mode laser operation, which suppresses spatial hole burning and produces single-mode operation in a standing-wave resonator, is revisited for the case of optically anisotropic laser mirrors presenting arbitrary birefringent and dichroic properties. Our analysis clarifies the relationship between the mirrors’ optical properties and the proximity of the polarization states of the counterpropagating waves, which determines the contrast of the standing-wave pattern inside the resonator. The intensity of the principal mode and the population of the upper laser level as a function of the pumping rate are then determined analytically, which enables estimates of the slope efficiency and threshold of multimode emission for a given contrast value of the standing wave. The inversion density is found to reach an upper bound as a function of the pumping rate for every value of the contrast except unity. The design rules for anisotropic mirrors to produce single-frequency operation are provided that are less strict than those to achieve pure twisted-mode operation.

中文翻译：

---

使用各向异性激光镜控制激光器中的空间孔燃烧

对于光学各向异性激光镜具有任意双折射和二向色性的特性，人们重新考虑了扭曲模式激光操作的概念，该概念可抑制空间空穴燃烧并在驻波谐振器中产生单模操作。我们的分析阐明了反射镜的光学特性与反向传播波的偏振态的接近程度之间的关系，这决定了谐振器内部驻波图的对比度。然后，通过分析确定主模的强度和上激光能级的强度（随泵浦率的函数），从而可以针对给定的驻波对比度值估算斜率效率和多模发射阈值。对于除单位以外的对比度的每个值，发现反转密度达到上限，作为泵浦速率的函数。所提供的各向异性反射镜产生单频工作的设计规则要比实现纯扭曲模式工作的规则要严格一些。