Lasing operation under pulsed optical pumping of 1.55 /spl mu/m external-cavity VCSELs using an InP/AlGaInAs bottom Bragg reflector

We present half vertical cavity surface emitting lasers (VCSELs), based on a new type of InP/AlGaInAs distributed Bragg reflector (DBR) and on InAlAs/AlGaInAs DBR. Lasing effect under pulsed optical pumping in external cavity configuration was obtained. A comparison between these two materials systems is presented, as well as a first step in the design of the active cavity in order to optimize the absorption for the optical pumping.