John Dudley PhD FOSA FEOS FIEEE is Professor of Physics at the CNRS Research Institute FEMTO-ST in Besancon, France. He received his PhD in New Zealand, and worked in Scotland and New Zealand before his appointment as Professor in France in 2000. His research covers broad areas of optical science and he has published over 500 contributions in journals & conference proceedings and delivered over 120 invited talks at major conferences. He was co-investigator on the ERC project MULTIWAVE and has received funding from numerous sources both nationally & internationally. He has won numerous awards and fellowships, including the Médaille d'Argent of the national French research agency CNRS and awards from learned societies SPIE, OSA, and IOP, as well as four Honorary Degrees. He served as the President of the European Physical Society for a two year term from April 2013-March 2015. In 2009, he initiated and Chaired the International Year of Light & Light-based Technologies 2015 and chaired the follow-up International Day of Light which has seen the proclamation by UNESCO of an annual and permanent day of celebration of light and its impact on science, culture and development. In September 2018 he was awarded the Harold E. Edgerton Award of SPIE for 2019, recognizing his contributions to ultrashort pulse measurements in nonlinear fibre optics.
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Recently, ghost imaging was transposed into the time-domain to image ultrafast varying waveforms. Here, we report on a novel proof-of-concept experiment of computational ghost imaging in the time domain using wavelength multiplexing. By encoding different time-varying intensity patterns onto separate wavelength channels, we can perform simultaneous measurement of multiple realizations. This allows us to perform ghost imaging in real-time, without the need of probing the time-varying object repeatedly. Specifically, we use a programmable spectral filter to encode a set of 32 Hadamard-like time-varying intensity patterns onto a broadband LED light source. An electro-optic intensity modulator driven by an electrical waveform is used to create the time-varying object to be measured. The object is then reconstructed “blindly” by correlating the time-averaged transmission of each wavelength channels with the digitized form of the time-varying Hadamard patterns that illuminate the object. The temporal resolution of the measurement is currently to 0.5 s limited by the speed at which the variable spectral filter can be manipulated.
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