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Low-repetition-rate, high-energy, twin-pulse, passively mode locked Y b 3 + -doped fiber laser

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Abstract

We report an all-normal-dispersion, low-repetition-rate, high-energy, twin-pulse, passively mode locked ytterbium-doped fiber laser. The mode-locking mechanism of the laser is based on nonlinear polarization evolution and strong pulse shaping with a cascade long-period fiber grating bandpass filtering in a highly chirped pulse. The laser generates a highly stable twin-pulse group with 248ps and 296ps duration simultaneously and maximum pulse energy of 26.8nJ—each pulse at a 2.5445MHz repetition rate. Energy quantization is observed, which demonstrates the nonparabolic nature of these pulses. The laser can also work in third-harmonic mode locking with 17.8nJ energy (at a repetition rate of 7.65MHz and pulse width of 780ps).

© 2011 Optical Society of America

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