Structure optimization of high speed intracavity-contacted oxide-confined VCSELs
This work presents the simulation of the intracavity contacted oxide confined vertical cavity surface emitting lasers (VCSEL) including the thermal effects. The analysis of thermal, electrical and optical phenomena represents the influence of geometrical parameters on power and modulation properties on such devices.
Current crowding in graded contact layers of intracavity-contacted oxide-confined vertical-cavity surface-emitting lasers
In this work we present the simulation of the intracavity-contacted oxide-confined vertical-cavity surface-emitting lasers including the thermal effects. We analyze the thermal, electrical, and optical properties of such devices with the different thicknesses of graded layers between the contact and oxide confined layers. Results of simulations for the devices with graded layer thickness of 40–60 A show a reduced current crowding effect.
High efficiency submilliamp vertical cavity lasers with intracavity contacts
Contacts have been made to p- and n-type layers on opposite sides of the active region within the cavity of an InGaAs vertical cavity surface emitting laser. The two concentric ring contacts allow all electrical connections on and emission from the top surface of a semi-insulating GaAs substrate. The design includes a novel current leveling layer to minimize current crowding effects. A high external quantum efficiency of 46% has been measured with maximum output powers up to 6 mW for a 15 /spl mu/m diameter device and threshold currents of 0.72 mA for a 7 /spl mu/m diameter laser.<<ETX>>