Laser cooling includes several techniques where atoms, molecules, and small mechanical systems are cooled with laser light. The directed energy of lasers is often associated with heating materials, e.g. laser cutting, so it can be counterintuitive that laser cooling often results in sample temperatures approaching absolute zero. Laser cooling relies on the change in momentum when an object, such as an atom, absorbs and re-emits a photon. For example, if laser light illuminates a warm cloud of atoms from all directions and the laser's frequency is tuned below an atomic resonance, the atoms will be cooled. This common type of laser cooling relies on the Doppler effect where individual atoms will preferentially absorb laser light from the direction opposite to the atom's motion. The absorbed light is re-emitted by the atom in a random direction. After repeated emission and absorption of light the net effect on the cloud of atoms is that they will expand more slowly. The slower expansion reflects a decrease in the velocity distribution of the atoms, which corresponds to a lower temperature and therefore the atoms have been cooled. For an ensemble of particles, their thermodynamic temperature is proportional to the variance in their velocity. More homogeneous velocities between particles corresponds to a lower temperature. Laser cooling techniques combine atomic spectroscopy with the aforementioned mechanical effect of light to compress the velocity distribution of an ensemble of particles, thereby cooling the particles.
Electromagnetically induced transparency (EIT) is a coherent optical nonlinearity which renders a medium transparent within a narrow spectral range around an absorption line. Extreme dispersion is also created within this transparency "window" which leads to "slow light", described below. It is in essence a quantum interference effect that permits the propagation of light through an otherwise opaque atomic medium.
Lene Vestergaard Hau is a Danish physicist and educator. She is the Mallinckrodt Professor of Physics and of Applied Physics at Harvard University.
Ataç İmamoğlu is a Turkish-Swiss physicist working on quantum optics and quantum computation. His academic interests are quantum optics, semiconductor physics, and nonlinear optics.
Vladimir (Vlad) M. Shalaev is a Distinguished Professor of Electrical and Computer Engineering and Scientific Director for Nanophotonics at Birck Nanotechnology Center, Purdue University.
Robert Louis Byer is a physicist. He was president of the Optical Society of America in 1994 and of the American Physical Society in 2012.
Anthony Michael Johnson is an American experimental physicist, a professor of physics, and a professor of computer science and electrical engineering at the University of Maryland, Baltimore County (UMBC). He is the director of the Center for Advanced Studies in Photonics Research (CASPR), also situated on campus at UMBC. Since his election to the 2002 term as president of the Optical Society, formerly the Optical Society of America, Johnson has the distinction of being the first and only African-American president to date. Johnson's research interests include the ultrafast photophysics and nonlinear optical properties of bulk, nanostructured, and quantum well semiconductor structures, ultrashort pulse propagation in fibers and high-speed lightwave systems. His research has helped to better understand processes that occur in ultrafast time frames of 1 quadrillionth of a second. Ultrashort pulses of light have been used to address technical and logistical challenges in medicine, telecommunications, homeland security, and have many other applications that enhance contemporary life.
Anthony E. Siegman was an electrical engineer and educator at Stanford University who investigated and taught about masers and lasers. Known to almost all as Tony Siegman, he was president of the Optical Society of America [now Optica (society)] in 1999 and was awarded the Esther Hoffman Beller Medal in 2009.
Yoshihisa Yamamoto is the director of Physics & Informatics Laboratories, NTT Research, Inc. He is also Professor (Emeritus) at Stanford University and National Institute of Informatics (Tokyo).
Robert William Boyd is an American physicist noted for his work in optical physics and especially in nonlinear optics. He is currently the Canada Excellence Research Chair Laureate in Quantum Nonlinear Optics based at the University of Ottawa, professor of physics cross-appointed to the school of electrical engineering and computer science at the University of Ottawa, and professor of optics and professor of physics at the University of Rochester.
Rupamanjari Ghosh was the second Vice-Chancellor of Shiv Nadar University, Uttar Pradesh, India. She is also the former founding Director of School of Natural Sciences and founding Dean of Research & Graduate Studies at Shiv Nadar University, and a former Professor of physics and Dean at the School of Physical Sciences, Jawaharlal Nehru University, New Delhi. Her research areas include Experimental and Theoretical Quantum Optics, Laser Physics, Nonlinear Optics, Quantum Information, Quantum Measurement and Magneto-Optics.
Peter E. Toschek was a German experimental physicist who researched nuclear physics, quantum optics, and laser physics. He is known as a pioneer of laser spectroscopy and for the first demonstration of single trapped atoms (ions). He was a professor at Hamburg University.
David A. B. Miller is the W. M. Keck Foundation Professor of Electrical Engineering at Stanford University, where he is also a professor of Applied Physics by courtesy. His research interests include the use of optics in switching, interconnection, communications, computing, and sensing systems, physics and applications of quantum well optics and optoelectronics, and fundamental features and limits for optics and nanophotonics in communications and information processing.
Andrew Marc Weiner OSA NAE NAI was an American electrical engineer, educator and researcher known for contributions to the fields of ultrafast optics and optical signal processing. He was the Scifres Family Distinguished Professor of Electrical and Computer Engineering at Purdue University.
Avraham (Avi) Gover is an Israeli professor of Electrical Engineering in the Physical Electronics Department of the Engineering Faculty at Tel Aviv University, specializing in Quantum Electronics and FEL Physics. Gover is also the head of the Israeli Center for Radiation Sources and Applications in Ariel. In 2005, he was awarded the international FEL prize "in recognition for his outstanding contributions to Free Electron Laser science and technology".
Herbert Graves Winful is a Ghanaian-American engineering professor, whose honours include in 2020 the Quantum Electronics Award. He is the Joseph E. and Anne P. Rowe Professor of Electrical Engineering, Arthur F. Thurnau Professor of Electrical Engineering and Computer Science, and a Professor of Physics at the University of Michigan.
Hui Cao (曹蕙) is a Chinese American physicist who is the professor of applied physics, a professor of physics and a professor of electrical engineering at Yale University. Her research interests are mesoscopic physics, complex photonic materials and devices, with a focus on non-conventional lasers and their unique applications. She is an elected member of the US National Academy of Sciences and of the American Academy of Arts and Sciences.
Malvin Carl Teich is an American electrical engineer, physicist, and computational neuroscientist which is professor emeritus of electrical engineering at Columbia University and physics at Boston University. He is also a consultant to government, academia, and private industry, where he serves as an advisor in intellectual-property conflicts. He is the coauthor of Fundamentals of Photonics, and of Fractal-Based Point Processes.
Alexander Luis Gaeta is an American physicist and the David M. Rickey Professor of Applied Physics at Columbia University. He is known for his work on quantum and nonlinear photonics. He is a Fellow of the American Physical Society, Optica, and of the Institute of Electrical and Electronics Engineers.
Demetrios N. Christodoulides is a United States physicist known for his work in quantum optics and nonlinear optics and photonics. He is currently the Steven and Kathryn Sample Chair in Engineering, and Professor of Electrical and Computer Engineering at the University of Southern California.
