Journal
OPTICS EXPRESS
Volume 15, Issue 23, Pages 15595-15602Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.15.015595
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We report on environmentally stable mode-locked Yb-doped all-fiber lasers operating in the wave-breaking- free and stretched-pulse regime. The compact linear cavity is constructed with saturable absorber mirror directly glued to the fibers end-facet as nonlinear mode-locking mechanism and chirped fiber Bragg grating for dispersion management, thus, without any free-space optics. In the wave- breaking-free regime the laser generates positively-chirped pulses with a pulse duration of 15.4 ps. These pulses are compressed to 218 fs in a hollow-core photonic bandgap fiber spliced to the output port. Adaptation of dispersion management has led to operation in the stretched- pulse regime, where a parabolic spectral profile is obtained as well. In this regime pulses are compressible to 213 fs. Numerical simulations are presented which confirm the wave-breaking-free and stretched-pulse evolution inside the fiber laser cavity. Both regimes are compared in terms of pulse quality. (c) 2007 Optical Society of America.
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