| 摘要 |
<p>According to the present invention there is provided a laser with compact planar ring cavity that produces unidirectional laser oscillation without using intracavity elements, and which can operate in single-frequency regime. A special prism is used as output coupler and the properties of internal reflection in this prism are used to select one of the two possible oscillation directions of the ring cavity. The compact design, without intracavity elements to enforce unidirectional oscillation, allows higher output powers to be achieved. Stable single- frequency operation is achieved by the combined use of frequency selective elements, such as volume Bragg gratings, etalons, or birefringent filters, with a compact design of the cavity, which can include a monolithic structure, and the use of structural materials with low thermal expansion coefficient.</p> |
