Siegman A E
Appl Opt. 1974 Feb 1;13(2):353-67. doi: 10.1364/AO.13.000353.
This paper reviews the current level of theoretical understanding and experimental confirmation of the properties of unstable optical resonators for laser oscillators. A primary conclusion is that for any laser system characterized by a moderate gain per pass and a Fresnel number greater than a few times unity the unstable resonator provides the best practical resonator design for obtaining a high-quality near-diffraction-limited output laser beam combined with efficient energy extraction from the laser medium.
本文回顾了激光振荡器不稳定光学谐振器特性的当前理论理解水平和实验验证情况。一个主要结论是，对于任何每程增益适中且菲涅耳数大于几倍单位值的激光系统，不稳定谐振器为获得高质量近衍射极限输出激光束并结合从激光介质中高效提取能量提供了最佳的实际谐振器设计。
