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Two-loop feedback controlled laser: new possibilities for ultrashort-pulse generation and high-level stabilization

In this paper we report the new two-loop feedback stabilization system allowing stable operation of both continuous and pulse lasers in wide range of active media gain and resonator Q. Different combinations of negative and positive feedback loops were investigated. Negative one round-trip time Tr delayed and positive 2Tr delayed feedback loops combination was found to provide the extremely large stability zone. In self-mode-locked laser, such combination leads to the significant laser pulse shortening.