Department of Electronic Science and Engineering. Kyoto University, Japan
Abstract: LiDAR sensing and laser processing are becoming core technologies for smart mobility and smart processing. For example, LiDAR sensing is becoming essential for smart mobility of factory automation robots, farm machines, construction machines, and automobiles, while laser processing is becoming important for the smart processing of electronics, automobiles, and solar cells. Currently, key devices for these applications are broad-area semiconductor lasers, CO2 lasers and fiber lasers. However, these lasers have individual issues (or bottlenecks) such as low brightness (broad-area semiconductor lasers), large size and low efficiency (CO2 lasers and fiber lasers), and complicated configuration (fiber lasers).
In the present talk, I will show that the key to fix the above bottlenecks is the photonic-crystal surface-emitting lasers (PCSELs). PCSELs are an unprecedented type of semiconductor laser, with which single longitudinal and lateral mode oscillation can be achieved over areas as broad as millimeters in diameter. Their brightness, which is defined as power per unit area per unit solid angle, is expected to reach up to . In addition, PCSELs can achieve numerous functions, including the generation of beams with a variety of patterns and polarizations, and even electric two-dimensional beam scanning.
Following the above explanation of the fundamental properties of PCSELs, I will demonstrate the usefulness of PCSELs for LiDAR applications at first, then I will provide a perspective on their application to laser processing. I will also briefly mention that material systems for PCSELs are expanding to not only InGaAs/GaAs (900-1000nm), but also InGaAsP/InP (1.3-1.55um) and even InGaN/GaN (400-530nm). By doing so, I will show that PCSELs can serve as the key devices for various applications including LiDAR sensing and laser processing in the near future.
Biography: Susumu Noda is a full Professor, Department of Electronic Science and Engineering, Kyoto University, and also Director of Photonics and Electronics Science and Engineering Center, Kyoto University. His research interest includes physics and applications of photonic crystals and the related photonic nanostructures. He received various awards, including Optical Society of America Joseph Fraunhofer Award / Robert M. Burley Prize (2006), the IEEE Nanotechnology Pioneer Award (2009), Medal with Purple Ribbon (2014), the Japan Society of Applied Physics Outstanding Achievement Award (2015), and MOC Awards (2019).