Solid State & Optics Seminar Series
sponsored by “The Flint Fund Series on Quantum Devices and Nanostructures”
Wednesday, April 10, 2019
Mann Engineer Student Center - Room 107
(located in Dunham Lab – 10 Hillhouse Ave)
Prof. Daniel J. Blumenthal
University of California at Santa Barbara
“Ultra-Stable Photonic Integrated Sub-Hz Linewidth Brillouin Lasers and Their Applications”
Ultra-narrow linewidth, ultra-low phase noise and ultra-high frequency stability form the heart of precision high-end scientific systems including atomic clocks, spectroscopy and position and navigation. However, these lasers have been relegated to the domain of table top and fiber lasers systems and optical reference cavities. Moving this level of performance to an integrated laser platform opens the possibility to reduce cost, size and power of these systems as well as make this technology available to a wider range of applications.
In this talk, a new class of photonic integrated ultra-low linewidth and stability laser will be described. The laser is a stimulated Brillouin scattering (SBS) laser, capable of sub-Hz fundamental linewidth emission fabricated in an ultra-low loss silicon nitride waveguide platform. The underlying physics, design, fabrication and performance of this laser will be covered. Methods to reduce the close to carrier noise, further reducing the integral linewidth, using miniature and integrated reference stabilization cavities will be described. Additionally, improving the long term fractional frequency stability and drift to unprecedented levels will be described. Applications that leverage this level of performance and stability at the chip-scale will be described including chip-scale atomic clocks and a new frequency stable coherent optical transmission based link for low-energy scalable data center interconnects (FRESCO).
Daniel J. Blumenthal received the Ph.D. degree from the University of Colorado, Boulder (1993), the M.S.E.E. from Columbia University (1988) and the B.S.E.E from the University of Rochester (1981). He is currently a Professor in the Department of ECE at UCSB, Director of the Terabit Optical Ethernet Center (TOEC) and heads the Optical Communications and Photonics Integration (OCPI) group (ocpi.ece.ucsb.edu). Dr. Blumenthal is Co-Founder of Packet Photonics Inc. and Calient Networks, manufacturers of optical communications and network equipment. He holds 22 patents and has published over 425 papers in the areas of Optical communications and optical packet switching, ultra-narrow linewidth integrated lasers, optical gyro sensors, InP, Silicon Photonic, and ultra-low loss silicon nitride waveguide photonic integration, photonic molecules, nano-photonic devices, microwave photonics. He is co-author of Tunable Laser Diodes and Related Optical Sources (New York: IEEE–Wiley, 2005) and has published in the Proceedings of the IEEE. Dr. Blumenthal is a 2017 Fellow of the National Academy of Inventors (NAI), Fellow of the IEEE and Fellow of the Optical Society of America. He has served on the Board of Directors for National LambdaRail (NLR) and as an elected member of the Internet2 Architecture Advisory Council. He is recipient of a Presidential Early Career Award for Scientists and Engineers (PECASE), a National Science Foundation Young Investigator Award (NYI) and an Office of Naval Research Young Investigator Program (YIP) Award and has served on numerous program committees including OFC, Photonics in Switching and as guest editor of multiple IEEE Journal special issues.
Hosted by Prof. Peter Rakich
Applied Physics, Yale University