Spatio-temporal coupling of laser fluctuations — Observations on a laser with internal frequency conversion |
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| Authors: | F. G. Laeri N. Deutsch G. Angelow M. Müller H. Sakowski |
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| Affiliation: | (1) TH-Darmstadt, Institute of Applied Physics, Schloßgartenstraße 7, D-64289 Darmstadt, Germany;(2) Carl Zeiss, D-73446 Oberkochen, Germany |
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| Abstract: | The amplitude of standing wave solid state lasers with frequency conversion inside the resonator can become unstable. We investigated the amplitude fluctuations of an end-pumped Nd:YAG-laser at low pump rates (below 160% threshold pump power) and also above. Detecting the individual mode instabilities separately and comparing them with a theoretical laser model, we can trace the origin of the mechanism leading to the observed fluctuations. At certain well defined discrete pump levels above 160% threshold the instabilities disappear. These stable emission states are associated with particular nonconventional mode patterns, some of them exhibiting a helical phase structure. Based on experimental observations and computer simulations of pump induced resonator aberrations we describe a mechanism for the emergence of the peculiar transversal modes and laser fluctuations. |
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| Keywords: | 42.50.Ne 42.52.+x 42.55.* 42.65.* 42.50.Ar 42.50.Lc |
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