Abstract
We show that the spectral response of a Fabry–Perot semiconductor saturable absorber depends on laser beam focusing. We used this effect to achieve stable passive mode-locked operation in a simple and environmentally stable fiber laser by introducing spectral filtering and forcing near-resonant operation. By reducing the free spectral range and increasing the nonlinear response of the Fabry–Perot saturable absorber, we obtained dual-wavelength mode-locked operation.
© 2000 Optical Society of America
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