Abstract
An efficient method to generate coherent laser beams of large dimensions is the use of unstable resonators.1 Unstable resonators are inherently lossy, however, due to the beam magnification at each round-trip. Their use is therefore limited to laser media which have sufficient gain to overcome these intrinsic losses. In this paper we present experimental and theoretical results which show that such a limitation can be overcome by using mirrors with a phase step at center.
© 1991 Optical Society of America
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