Dissertation Talk: Design and Physics of VCSELs for Emerging Applications
Seminar | May 14 | 2:30-3:30 p.m. | Cory Hall, 400 Hughes Room
Jonas Kapraun, UC Berkeley
Vertical cavity surface emitting lasers (VCSELs) have been widely employed in short distance optical interconnects. Recently however a series of emerging applications are creating a rapidly growing demand for compact, low cost and high-performance light sources. 3D imaging and proximity sensing capabilities based on time of flight and structured light schemes are currently being deployed in a vast amount of consumer hand held devices, in particular in cell phones. Here VCSEL arrays of various sizes, densities and powers are being employed in volumes of multiple hundreds of millions per year. At the same time, wavelength tunable VCSELs with wide tuning range, fast tuning speed and single mode continues wavelength tuning are of tremendous interest for swept source optical coherence tomography (SS-OCT). This talk introduces a series of VCSEL designs, including widely wavelength tunable devices and VCSELs with lithographically defined aperture based on a buried InGaP heterostructure as well as a buried tunnel junction.