We present a comparison between the Self-Filtering Unstable Resonator (SFUR) and the Generalised Self Filtering Unstable Resonator (GSFUR) based on some unpublished relationships among GSFUR parameters. Calculations show that, when the resonator magnification |M| is less than 14, depending on some geometrical parameters, the SFUR may give a larger mode volume (and then a larger output energy) than GSFUR, independently of the cavity length. This unexpected result can help to choose the "best" resonator between SFUR and GSFUR in order to exploit as much as possible the active medium with a rapid steady-state establishment of the transverse mode structure. © 2002 Elsevier Science B.V.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering