Abstract
A Nd:YAG laser with an intracavity frequency doubling crystal displays irregular intensity fluctuations for certain ranges of operating parameters.1,2 Analysis of the laser system shows that these fluctuations are chaotic in nature, and that it is possible to operate the laser stably in selected parameter regimes.2,3 It has also been shown experimentally that dynamical control of such a laser system is possible, and that a variety of periodic waveforms as well as the unstable steady state can be stabilized through an appropriate feedback technique called occasional proportional control.4,5 In this technique, tiny kicks are given to the pump excitation, that depend in amplitude on the difference of the output intensity from a chosen reference level, and with a period related to the relaxation oscillation period. The laser may be maintained in a stabilized steady state over a wide range of pumping if a tracking procedure is used that makes suitable changes in the control circuit parameters as the pump level is altered.
© 1993 Optical Society of America
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