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Off-Resonance Control and All-Optical Switching: Expanded Dimensions in Nonlinear Optics
摘要： The theory of non-resonant optical processes with intrinsic optical nonlinearity, such as harmonic generation, has been widely understood since the advent of the laser. In general, such effects involve multiphoton interactions that change the population of each input optical mode or modes. However, nonlinear effects can also arise through the input of an off-resonant laser beam that itself emerges unchanged. Many such effects have been largely overlooked. Using a quantum electrodynamical framework, this review provides detail on such optically nonlinear mechanisms that allow for a controlled increase or decrease in the intensity of linear absorption and fluorescence and in the efficiency of resonance energy transfer. The rate modifications responsible for these effects were achieved by the simultaneous application of an off-resonant beam with a moderate intensity, acting in a sense as an optical catalyst, conferring a new dimension of optical nonlinearity upon photoactive materials. It is shown that, in certain configurations, these mechanisms provide the basis for all-optical switching, i.e., the control of light-by-light, including an optical transistor scheme. The conclusion outlines other recently proposed all-optical switching systems.
关键词： absorption,nonlinear optics,all-optical switch,resonance energy transfer,fluorescence,FRET,optical transistor,multiphoton process,laser action,second harmonic generation
更新于2025-09-23 15:19:57
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[IEEE 2018 2nd International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT) - Ankara, Turkey (2018.10.19-2018.10.21)] 2018 2nd International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT) - Relativistic High Harmonic Generation
摘要： In recent advance, laser atom interaction has made significant progress in theoretical and experimental method. This article is devoted to a review of recent relativistic High Harmonic Generation (HHG) and Above Threshold Ionization (ATI) in intense laser field is investigated via the Klein-Gordon equation with ponderomotive approach. Thus, in relativistic effects at higher intensity are discussed within strong field approximation (SFA). Moreover, with this relativistic effect shows the simple representation in harmonic spectrum for Ar8+ ion exposed to 800 nm laser field and will be given current information on how the harmonic spectrum changes and how it will be affected attosecond pulse production in ultra-fast dynamic.
关键词： Attosecond pulse,Multiphoton process,Strong laser field,ATI,Relativistic effect,Ultra-fast Dynamics,HHG
更新于2025-09-04 15:30:14