Abstract
Powerful single-frequency fiber lasers are usually based on the amplification of low-power radiation of a semiconductor laser diode in several fiber cascades. Amplification of laser radiation in active fiber can undergo mode instability (MI) effect [1-4]. It is observed at output powers exceeding certain level called mode instability power threshold (MIPT). It was found that threshold power increases with input signal power [1]. Thus, MI can occur in any of the amplification stages, but at different MIPTs.
© 2017 IEEE
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