By solving the Schrödinger and Poisson equations selfconsistently for AlGaN/GaN QWs, we calculate the intersubband optical absorption coefficients for QWs with various well thicknesses. By increasing the well thickness, the amplitude of the dipole matrix increases slowly. However, the decrease of the energy separation results in the red-shift of the resonant absorption peak and the decrease of the magnitude of the absorption peak. Moreover, when the well thickness decreases to 10 Å, the evident decrease of the overlap between wave functions for the first two subbands leads to the abrupt decrease of the amplitude of the dipole matrix and the absorption peak. These results indicate that the intersubband optical absorption can be greatly modulated by the well thickness, the built-in electric field has an important effect on the intersubband absorption coefficients in III-nitride QWs, and III-nitride QWs are potential candidates for the design and application of intersubband devices.
A high-power 1.55 pm large optical cavity laser structure is successfully prepared for the first time by reasonably designing its configuration and by using a proper single step liquid phase epitaxy so as to realize lasers with peak output power higher than 2 W per facet in pulsed operation at room temperature. The devices are also characterized by their lower threshold current (Jth<2.7 kA/cm' for broad area contact structure) and high-temperature stability (To= 130 K). At the same time they are of long-lived operation and are an ideal source of light in this spectral region.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.