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Observation and investigation of off-axis modes in a high-power Nd:YAG laser

Konstantin V. Volodchenko, Michael S. Kurdoglyan, Chil-Min Kim, and Gyu Ug Kim

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Abstract

Unusual transverse patterns were observed in a cw-lamp-pumped Nd:YAG laser near the boundaries of the stability zones of the laser resonator. An interpretation of these patterns is given in terms of off-axis modes, which can be excited owing to spherical aberrations and astigmatism of the thermal lens and thermally induced birefringence. Additional evidence of the off-axis character of the observed modes was obtained by analysis of the temporal behavior of the observed patterns.

© 2004 Optical Society of America

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