EventsDr. Abdullah Demir

Semiconductor Laser Diodes: From Macro- to Nano-Scale

Semiconductor lasers are widely used in optical communications, industrial and consumer applications due to their small footprint, high efficiency, long lifetime and electronic integration. Superior performance and innovative approaches are desired by the existing, emerging and future applications of these lasers. In this talk, I will present demonstrations of novel methodologies developed during my academic and industrial research work addressing these needs at different size scales. The increase of the output power from a high-power semiconductor laser chip has remained challenging within the last decade. I will discuss the power limitation mechanisms and demonstrate our experimental results showing significant improvement of the output power by using a novel technique of gain and photon profile engineering. I will present a new microscale laser fabrication method developed to overcome the restrictions and problems of the current micro-laser technology. This method allows reducing the laser size that paves the way for nanoscale lasers. Finally, I will discuss our current and future research program on semiconductor nano-lasers, PT-symmetric laser arrays, and high-power laser diodes.

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About The Speaker

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Dr. Abdullah Demir received his B.S. in Physics and M.S. in Computational Science & Engineering from Koç University in 2002 and 2005, respectively. He received his M.S. and Ph.D. degrees in Optics & Photonics from the College of Optics and Photonics (CREOL) at University of Central Florida (UCF) in the USA in 2007 and 2010, respectively. His doctoral research studied quantum dot lasers and vertical-cavity-surface-emitting lasers (VCSELs), where he developed the first GaAs-based oxide-free VCSEL currently under development for commercialization in the USA. In 2011-2015, he worked as Senior Scientist and Staff Engineer in R&D groups of semiconductor laser companies (JDSU Corporation and Lumentum LLC) in the USA. His industrial research focused on semiconductor laser chips for kW level high power laser systems and the development of consumer laser products. He worked as a research associate in the Physics Department of Bilkent University in 2016-2017. Currently, he is a European Union Marie Curie Fellow (EU MSCA-IF) at Bilkent University.