Ivanov P. Influence of optical mode composition on operating characteristics of vertical-cavity surface-emitting semiconductor lasers.

Subject of investigations: oxide-confined vertical-cavity semiconductor lasers (VCSELs) with quantum-well active layer. The aim: theoretical description of mode composition influence on static and dynamic characteristics of oxide-confined VCSELs. Consideration of two-dimensional photonic crystal (PC) with defect in order to obtain a single-mode in the laser. Methods: known methods of theoretical physics and mathematical simulation of processes using computers. The approximation of PC as a medium with PC effective refractive index is used. Results, novelty: The detailed diffusion-dynamical model is modified by using carrier and photon densities. It had improved properties of numerical methods and decreased the computation time. Modulation properties of the VCSEL are considered in single and multimode conditions using the model. It is shown, that single-mode laser has wider modulation bandwidth and the use of known methods in order to obtain of single-mode results in decrease of output power. Two kinds of defects formed by removing one or seven holes in PC are considered. It had shown, that first defect is more effective for single-mode obtaining in the VCSELs. It had proposed and used a method for defining of borders between single and multimode regimes. The collection of solutions and recommendations for single-mode obtaining in VCSELs and waveguides in PC defects is developed. Experimental results demonstrated validity of developed theoretical model. Results obtained in the work had used for development of oxide-confined VCSELs with incorporated two-dimensional PC, and they can be used in further development of single-mode VCSELs and explanation of experimental results. Area of use: optics, laser physics.