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GaInNAs 1.3-μm quantum-well saturable absorber mirrors are characterized with spectrally resolved nonlinear reflectivity measurements over 70nm around the broadened band edge. All important parameters such as saturation fluence Fsat, modulation depth ΔR, and nonsaturable loss ΔRns are obtained relative to the photoluminescence (PL) peak. Fsat has a minimum of 4μJ∕cm2 10nm above the PL peak and ΔR scales with the linear absorption even in the bandtail. The product ΔR∙Fsat important to suppress Q-switching instabilities in mode-locked lasers decreases linearly with wavelength and reaches a minimum 20nm above the PL peak. We observed wavelength-independent nonsaturable losses of only about 10% of the maximum linear absorption. These results increase the understanding of optical and electronic properties of GaInNAs around the band edge.
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Grange et al. (2005) studied this question.
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