Abstract
We experimentally confirm that graphene within fiber laser cavities can generate
four-wave-mixing (FWM) by observing the laser spectral broadening and the transition
from the single-longitudinal-mode oscillation to multiple-longitudinal-mode one. Then,
by simultaneously exploiting the graphene-induced nonlinear FWM and its super-broadband
saturable absorption, we further achieve for the first time to the best of our
knowledge, multiwavelength Q-switched Yb<sup>3+</sup>- or Er<sup>3+</sup>-doped fiber
lasers at 1 <i>μ</i>m and 1.5 <i>μ</i>m wavebands, respectively.
Simultaneous 23-wavelength Q-switching oscillation with a wavelength spacing of 0.2 nm
is stably generated at 1.5 <i>μ</i>m waveband. The multiwavelength Q-switched
pulses have the minimum pulse duration of 2.5 <i>μ</i>s, the maximum pulse energy of 72.5
nJ and a wide range of pulse-repetition-rate (PRR) from 2.8 to 63.0 kHz. At 1
<i>μ</i>m waveband, we also obtain five-wavelength simultaneous lasing in
Q-switching regime with the pulse duration of ~3<i>μ</i>s, pulse energy of 10.3 nJ
and PRR between 39.8 and 56.2kHz.
© 2011 IEEE
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