Abstract
Raman scattering (RS) effect, a nonlinear optical phenomenon for the frequency down-shifted stokes wave generation, has attracted a lot of attention due to its large potential applications in broadband optical amplifiers, tunable lasers and telecommunications, etc. As reported, the RS effect has been generated in all normal dispersion fiber by an amplified gain switched laser diode or a picosecond pulsed master oscillator power amplifier (MOPA) system at 1064 nm [1, 2]. Recently, all normal dispersion passively mode-locked Yb-doped fiber lasers (YDFLs) have been reported to generate high energy pulses [3]. Besides, the Q-switched and mode-locked (QML) pulses have been reported in YDFL systems by decreasing the pulse repletion rate to increase the pulse energy [4]. In this work, we investigate the cascaded RS based on a nonlinear Yb3+-doped silicate fiber amplifier, seeded by a QML fiber laser.
© 2014 Japan Society of Applied Physics, Optical Society of America
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