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Abstract
We report 30 fs level pulse generation directly from a mode locked Er:fiber laser at a repetition rate of 225 MHz.
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A 301 MHz fundamentally mode-locked erbium fiber ring laser generating 108 fs pulses is demonstrated. Novel combination of gain fiber with anomalous group-velocity dispersion and intra-cavity silicon with normal group-velocity dispersion yields a stretched-pulse operation.
Passively mode-locked fiber lasers are the best pulsed sources available today due to their simplicity and their ability to generate transform-limited pulses in the picosecond regimes. A drawback of the conventional passively mode-locked fiber lasers is that the pulse repetition rate is relatively low, at best a few tens of MHz, because of long cavity length. In order to raise repetition rate up to a few GHz, the cavity length has to be shortened below a few centimeters. Fiber lasers with such a short cavity require a high gain fiber and a small saturable absorber with low loss. Recently, the authors have proposed and demonstrated a small and low-loss saturable absorber device incorporating carbon nanotubes (CNT). Using CNT, we have realized very stable 2cm-long, 5GHz mode-locked Er:Yb-codoped silica-fiber laser, but the output power was limited to ~0.2mW due to insufficient gain in the Er:Yb-codoped silica-fiber. Here we used heavily Er:Yb-codoped phosphate fiber to form 1cm-long cavity with fiber mirrors, and succeeded in generating stable pulse trains with output power as high as 30mW and repetition rate as high as 10GHz at 1535nm.
We demonstrate a high fundamental repetition rate erbium-doped fiber ring laser operated in strong normal dispersion regime passively mode-locked by the nonlinear polarization rotation technique. A novel scheme of using a polarization beam splitter as both the pump input coupler and the fiber laser output coupler is employed to increase the repetition rate of the fiber laser. Gain-guided solitons with a fundamental repetition rate of 234 MHz and 1.11 ps pulsewidth are achieved from the ring laser cavity.
We demonstrate passive mode-locking of a short-cavity (∼2 cm) fiber Fabry-Pe´rot laser by incorporating a carbon-nanotube-based saturable absorber. Stable pulses are generated with a pulsewidth as short as 0.68 ps at a repetition rate as high as 5.18 GHz. This is the smallest femtosecond fiber pulsed laser ever demonstrated to date.