It is well known that a solid-state laser with intracavity second-harmonic generation (SHG) exhibits instabilities which lead to chaotic dynamic behavior of the system, known as the "green problem."1·2 Such processes provide a rich set of dynamic effects, such as period doubling, intermittency and anitphase states, which have been observed and studied over the last several years.3 In this work, we present the results of a theoretical and experimental investigation of the dynamic behavior of a stoichiometric solid-state laser with intracavity SHG and sparse mode structure, characterized by unequal longitudinal mode spacing arising from etalon and thin-gain-section effects within the cavity. We prove that "green problem" instabilities can have a global character, and provide cases of homoclinic chaos, which have not been previously demonstrated for an intracavity SHG system.

© 1994 Optical Society of America

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