Optical gain was found in strongly confined CdSe quantum dots. As a result of a multitude of one- and two-electron-hole pair transitions, the gain region is broad and quasi-continuous and stretches below the absorption edge. We present a model for gain in a quasi-zero-dimensional quantum confined semiconductor system that agrees well with the femtosecond experiments.
© 1996 Optical Society of America
H. Giessen, U. Woggon, B. Fluegel, G. Mohs, Y. Z. Hu, S. W. Koch, and N. Peyghambarian, "Femtosecond optical gain in strongly confined quantum dots," Opt. Lett. 21, 1043-1045 (1996)