Abstract

This paper considers the transverse optical properties of an absorbing ring when it is lighted by a symmetrical Laguerre–Gauss beam TEMp0. It is demonstrated that the insertion of an opaque ring having adequate size inside a diaphragmed laser cavity is able to improve greatly (rate of about 100%) the discrimination between the TEM00 and the TEM10 modes, while keeping the diffraction losses unchanged or even decreased.

© 2010 Optical Society of America

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