Spontaneous Emission and Optical Gain in InGaAs Quantum Dots
InGaAs量子点的自发发射及光增益

The spontaneous emission,amplified spontaneous emission and optical gain in In Ga As quantum dots are investigat- ed.The peak wavelength of spontaneous em ission spectra and amplified spontaneous emission spectra exhibit blue shift with increasing of the injected current density,indicating distinctive band filling effect.No distinctive isolated states are observed in the spectra due to the inhom ogeneous broadening of the dot states related to the distribution of the size and the shape of the quantum dots.The net modal gain spectra are obtained by single- pass amplified spontaneous em ission spectra at different in- jected current densities.The blue shift of the gain peak and broadening of the gain spectra are observed.