Mode locking is a technique in optics by which a laser can be made to produce pulses of light of extremely short duration, on the order of picoseconds (10−12 s) or femtoseconds (10−15 s). A laser operated in this way is sometimes referred to as a femtosecond laser, for example, in modern refractive surgery. The basis of the technique is to induce a fixed phase relationship between the longitudinal modes of the laser's resonant cavity. Constructive interference between these modes can cause the laser light to be produced as a train of pulses. The laser is then said to be "phase-locked" or "mode-locked".
Nicolaas Bloembergen was a Dutch-American physicist and Nobel laureate, recognized for his work in developing driving principles behind nonlinear optics for laser spectroscopy. During his career, he was a professor at Harvard University and later at the University of Arizona and at Leiden University in 1973.
Titanium-sapphire lasers (also known as Ti:sapphire lasers, Ti:Al2O3 lasers or Ti:sapphs) are tunable lasers which emit red and near-infrared light in the range from 650 to 1100 nanometers. These lasers are mainly used in scientific research because of their tunability and their ability to generate ultrashort pulses thanks to its broad light emission spectrum. Lasers based on Ti:sapphire were first constructed and invented in June 1982 by Peter Moulton at the MIT Lincoln Laboratory.
In optics, an ultrashort pulse, also known as an ultrafast event, is an electromagnetic pulse whose time duration is of the order of a picosecond or less. Such pulses have a broadband optical spectrum, and can be created by mode-locked oscillators. Amplification of ultrashort pulses almost always requires the technique of chirped pulse amplification, in order to avoid damage to the gain medium of the amplifier.
In physics, terahertz time-domain spectroscopy (THz-TDS) is a spectroscopic technique in which the properties of matter are probed with short pulses of terahertz radiation. The generation and detection scheme is sensitive to the sample's effect on both the amplitude and the phase of the terahertz radiation.
In nonlinear optics, filament propagation is propagation of a beam of light through a medium without diffraction. This is possible because the Kerr effect causes an index of refraction change in the medium, resulting in self-focusing of the beam.
An ultrashort pulse laser is a laser that emits ultrashort pulses of light, generally of the order of femtoseconds to one picosecond. They are also known as ultrafast lasers owing to the speed at which pulses "turn on" and "off"—not to be confused with the speed at which light propagates, which is determined by the properties of the medium, particularly its index of refraction, and can vary as a function of field intensity and wavelength.
EKSPLA is a laser and laser electronics manufacturing company based in Vilnius, Lithuania. EKSPLA is known for their lasers and laser systems, as well as other photonics components. The company is supplying their products for scientific, OEM and industrial applications.
Eric Van Stryland was president of the Optical Society of America in 2005.
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.
Erich P. Ippen is a principal investigator in the Research Laboratory of Electronics (RLE) at the Massachusetts Institute of Technology (MIT). He holds appointments as the Elihu Thomson Professor of Electrical Engineering Emeritus and Professor of Physics Emeritus. He is one of the leaders of RLE’s Optics and Quantum Electronics Group.
Yuen-Ron Shen is a Chinese physicist. He is a professor emeritus of physics at the University of California, Berkeley, known for his work on non-linear optics. He was born in Shanghai and graduated from National Taiwan University. He received his Ph.D. in Applied Physics from Harvard under physicist and Nobel Laureate Nicolaas Bloembergen in 1963, and joined the department of physics at Berkeley in 1964. In the early years, Shen was probably best known for his work on self-focusing and filament propagation of laser beams in materials. These fundamental studies enabled the creation of ultrafast supercontinuum light sources. In the 1970s and 1980s, he collaborated with Yuan T. Lee on the study of multiphoton dissociation of molecular clusters. The molecular-beam photofragmentation translational spectroscopy that they developed has clarified much of the initial confusion concerning the dynamics of infrared multiphoton dissociation processes. In the 1980s and 1990s, Shen developed various nonlinear optics methods for the study of material surfaces and interfaces. Among these techniques, second-harmonic generation and sum frequency generation spectroscopy are best known and now widely used by scientists from various fields. He has collaborated with Gabor Somorjai on the use of the technique of Sum Frequency Generation Spectroscopy to study catalyst surfaces. He is the author of the book The Principles of Nonlinear Optics. Shen belongs to the prolific J. J. Thomson academic lineage tree. Currently, Shen works in U. C. Berkeley and Fudan University in Shanghai.
Pulsed operation of lasers refers to any laser not classified as continuous wave, so that the optical power appears in pulses of some duration at some repetition rate. This encompasses a wide range of technologies addressing a number of different motivations. Some lasers are pulsed simply because they cannot be run in continuous mode.
Michael David Fayer is an American chemical physicist. He is the David Mulvane Ehrsam and Edward Curtis Franklin Professor of Chemistry at Stanford University.
James G. Fujimoto is Elihu Thomson Professor of Electrical Engineering and Computer Science at the Massachusetts Institute of Technology (MIT) and a visiting professor of ophthalmology at Tufts University School of Medicine, Boston, Massachusetts.
Donna Theo Strickland is a Canadian optical physicist and pioneer in the field of pulsed lasers. She was awarded the Nobel Prize in Physics in 2018, together with Gérard Mourou, for the practical implementation of chirped pulse amplification. She is a professor at the University of Waterloo in Ontario, Canada.
Irina T. Sorokina is a Russian laser physicist. She works in Norway as a professor of physics at the Norwegian University of Science and Technology, and is the founder and CEO of spin-off company ATLA Lasers AS.
Debabrata Goswami FInstP FRSC, is an Indian chemist and the Prof. S. Sampath Chair Professor of Chemistry, at the Indian Institute of Technology Kanpur. He is also a professor of The Department of Chemistry and The Center for Lasers & Photonics at the same Institute. Goswami is an associate editor of the open-access journal Science Advances. He is also an Academic Editor for PLOS One and PeerJ Chemistry. He has contributed to the theory of Quantum Computing as well as nonlinear optical spectroscopy. His work is documented in more than 200 research publications. He is an elected Fellow of the Royal Society of Chemistry, Fellow of the Institute of Physics, the SPIE, and The Optical Society. He is also a Senior Member of the IEEE, has been awarded a Swarnajayanti Fellowship for Chemical Sciences, and has held a Wellcome Trust Senior Research Fellowship. He is the third Indian to be awarded the International Commission for Optics Galileo Galilei Medal for excellence in optics.
János Hebling is a Hungarian physicist, known for his preliminary works at Terahertz physics and spectroscopy. He was born at Zirc on 9 May 1954 and currently works as a professor at the Institute of Physics at University of Pécs and is an active researcher at the Hungarian Academy of Sciences and ELI.
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.
