Properties of unstable resonators with a nonreflecting central zone

Michel Piche; Daniel Cantin

doi:10.1117/12.18429

1 June 1990 Properties of unstable resonators with a nonreflecting central zone

Michel Piche, Daniel Cantin

Proceedings Volume 1224, Optical Resonators; (1990) https://doi.org/10.1117/12.18429
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

Abstract

The properties of unstable resonators in which localized amplitude or phase perturbations are induced at the center of the coupling mirror are investigated. Unstable resonators with a non-reflecting central zone have zero geometrical feedback; however, there exists a residual feedback due to diffraction at the mirror edges. Such a residual feedback can be significantly reduced using variable reflectivity mirrors. Negative branch unstable resonators with an opaque focal zone are even more efficient to quench this residual feedback. Enhancement of the feedback coefficient by factors up to 3 is predicted when the phase of the wave reflected at the coupling mirror changes over a restricted zone near its center.

Citation Download Citation

Michel Piche and Daniel Cantin "Properties of unstable resonators with a nonreflecting central zone", Proc. SPIE 1224, Optical Resonators, (1 June 1990); https://doi.org/10.1117/12.18429

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