Stretched-pulse mode-locking synchronously triggered by a femtosecond master laser at sub-megahertz repetition rate |
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Authors: | M Yan W Li K Yang H Zhou H Zeng |
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Institution: | 1. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062, China
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Abstract: | A stretched-pulse mode-locked ytterbium-doped fiber laser was passively synchronized to a femtosecond Ti:sapphire laser at
a low repetition rate of 240 kHz through large cross absorption modulation along additional 1-m-long erbium-doped fiber. The
synchronous fiber laser with an ultra-long fiber cavity could produce not only nanosecond flat-top pulses with tunable pulse
duration but also Gaussian-shape stretched pulses with its minimum pulse duration of ∼450 ps as confirmed by cross-correlation
measurement. When operating in the stretched pulse regime, the sub-nanosecond fiber laser could be synchronously triggered
by the master injection with the cavity-length mismatch tolerance up to ∼7.8 cm and timing jitter less than 400 fs, confirming
that the stretched-pulse mode-locking of the ultra-long slave fiber laser could be robustly controlled by cross absorption
modulation effects in the erbium-doped fiber with appropriate femtosecond master injection. |
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