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Last year the Symphony project collaboration (University of Warsaw, Uniwersytet Jagiellonski, DESY/CNR and ICFO) published a review on the occasion of the 25th anniversary of the “simple man’s models”, which underlie most of the phenomena that occur when intense ultrashort laser pulses interact with matter. The phenomena in question include High-Harmonic Generation (HHG), Above-Threshold Ionization (ATI), and Non-Sequential Double-Electron ion (NSDI). “Simple man’s models” provide both an intuitive basis for understanding the numerical solutions of the time-dependent Schrödinger equation, and the motivation for the powerful analytic approximations generally known as the Strong Field Approximation (SFA).
In this talk I will explain the SFA in the form we developed 25 years ago, in one of the most cited Phys. Rev. A papers, and mention its present and possible future applications.
We dedicate this work to the memory of Bertrand Carré, who passed away in March 2018 at the age of 60.