Abstract
We propose and study both numerically and experimentally a laser system controlled by the combination of positive and negative feedbacks capable to generate a long picosecond pulse train of stable amplitude as well as regular pulsation with sub-microsecond period. The proper combination of feedbacks is realized in a Nd:YAG laser with millisecond pumping by means of a single optoelectronic negative feedback which utilizes signal reflected from an intracavity Pockels cell polarizer. Regular pulsation (microgroups of picosecond pulses) with controlled period from 25 to 75 resonator round trips is obtained. The development of chaotic dynamics displayed by the system at higher pumping level differs from the Feigenbaum scenario. The regular pulsation regime has a great potential in a laser-electron X-ray generator design and other applications.
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