Fig. 3From: Development of a 1550-nm InAs/GaAs Quantum Dot Saturable Absorber Mirror with a Short-Period Superlattice Capping Structure Towards Femtosecond Fiber Laser ApplicationsPower dependent PL measurements. Room temperature power-dependent PL spectra measured at 20–2000 mW from a sample 1, b sample 2, and c sample 3, respectively. d Intensity radio of Peak 2/Peak 1 versus pumping power in samples 1, 2, and 3, respectively.Back to article page