| Paul Corkum | |
|---|---|
| Name | Paul B. Corkum |
| Birth date | 1943 |
| Birth place | Saint John, New Brunswick |
| Nationality | Canadian |
| Fields | Atomic physics, Optics, Quantum mechanics |
| Workplaces | National Research Council, University of Ottawa, McMaster University, National Research Council of Canada, Joint Quantum Institute |
| Alma mater | University of New Brunswick, Imperial College London |
| Known for | High-harmonic generation; three-step model; attosecond pulse generation |
| Awards | Wolf Prize in Physics, FRS, Officer of the Order of Canada |
Paul Corkum
Paul Corkum is a Canadian physicist notable for seminal contributions to the development of attosecond science and the theory of high-harmonic generation (HHG) in strong-field laser-atom interactions. His work—especially the three-step model—bridged theoretical quantum mechanics and experimental ultrafast optics to enable attosecond pulse production, influencing quantum control, imaging, and time-resolved studies of electron dynamics.
Paul Corkum was born in Saint John, New Brunswick and pursued undergraduate studies at the University of New Brunswick. He completed doctoral research at Imperial College London under mentorship that grounded him in atomic physics and laser physics. Early career appointments included positions at the National Research Council where he developed collaborations across North American and European laboratories. His training combined elements of theoretical quantum scattering and experimental optics, positioning him to address problems in strong-field interactions and attosecond phenomena.
Corkum is best known for co-developing the semi-classical three-step model (ionization, acceleration, recombination) explaining the origin of HHG when intense laser fields interact with atoms and molecules. This model provided an intuitive picture linking tunnel ionization and recombination to the emission of coherent extreme ultraviolet (XUV) and soft X-ray harmonics, enabling generation of isolated attosecond pulses. His theoretical framework was instrumental for experiments at laboratories such as Max Planck Institute for Quantum Optics, Lawrence Berkeley National Laboratory, and institutions like University of Ottawa and McMaster University that pursued attosecond metrology. The Corkum model directly influenced methods for producing and characterizing attosecond pulse trains and single pulses using techniques like amplitude gating and polarization gating.
Corkum contributed quantitative models connecting strong-field quantum dynamics to observable spectra, combining quantum mechanical tunneling theories (e.g., Keldysh theory) with classical electron trajectories. His work elaborated on electron wavepacket formation, phase matching in HHG, and the role of multielectron effects in molecules and solids. These insights advanced time-resolved studies of ultrafast electron correlation, charge migration, and nonadiabatic dynamics relevant to chemical physics, attochemistry, and condensed-matter systems. Corkum's theoretical approaches interfaced with computational methods developed in groups at MIT, ETH Zurich, and University of California, Berkeley to simulate attosecond electron dynamics and rescattering phenomena.
Although primarily theoretical, Corkum fostered extensive experimental collaborations that translated models into instrumentation. He worked with experimentalists to design ultrafast lasers, carrier-envelope phase stabilization schemes, and HHG beamlines used for attosecond pulse generation and pump–probe measurements. His influence is evident in apparatus developed at major centers such as SLAC National Accelerator Laboratory, Lawrence Livermore National Laboratory, and university-based ultrafast labs. Collaborations addressed challenges in phase matching, target media (gas jets, solids), and detection techniques including velocity map imaging and coincidence spectroscopy, enabling attosecond-resolved measurements of photoionization delays and electron release dynamics.
Corkum's work opened pathways for quantum control over electron motion on its natural timescale, informing techniques in coherent control, ultrafast spectroscopy, and emerging quantum technologies. HHG-based attosecond pulses enabled novel imaging modalities—attosecond transient absorption, time-resolved photoelectron spectroscopy, and molecular orbital tomography—impacting research in photochemistry, materials science, and nanotechnology. Applications extend to studying radiation damage in biological molecules, ultrafast magnetism in spintronics, and prospects for compact coherent XUV sources in lithography and semiconductor inspection. Corkum emphasized equitable access to scientific infrastructure through collaborative networks and training programs, advocating that breakthroughs in attosecond science be leveraged to address societal needs including energy materials and health-related imaging.
Paul Corkum has received numerous honors, including election as a FRS and national awards such as the Officer of the Order of Canada and the Wolf Prize in Physics. He has been recognized by organizations like the American Physical Society and the Canadian Association of Physicists for contributions to ultrafast science. Beyond prizes, Corkum's legacy includes mentorship of students and postdoctoral researchers who became leaders in attosecond and strong-field physics at institutions across North America and Europe. His advocacy for collaborative, interdisciplinary research and support for early-career scientists contributed to diversifying participation in quantum and optical sciences, aligning technical advances with broader goals of scientific justice and societal benefit.
Category:Canadian physicists Category:Attosecond physics Category:Quantum optics