Abstract

A novel femtosecond mode-locked variable-pulse-width laser system is developed based on coherent coupling technology. The laser system is composed of two fiber ring lasers that share an output coupler. Output longitudinal modes are emitted by the corresponding longitudinal modes of the laser modules. In this study, one longitudinal-mode spacing is changed arbitrarily by tuning the cavity length to control the output longitudinal modes. In the experiment, the laser system generates about 150 fs pulse width. The coupling result, which is the output pulse width, is changed by a length deviation of about 500 μm. As a result, the laser successful widens the pulse width to 1.5 ps at maximum and the tuning pulse width with 10 fs resolution at minimum.

© 2014 Optical Society of America

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