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Applied Physics & OSA Optics Seminar Extreme Terahertz sources Professor Roberto Morandotti Energy, Materials and Telecommunications (EMT) Center, National Institute of Scientific Research (INRS), Varennes, QC, Canada Abstract: We have recently demonstrated the generation of µJ-level, single-cycle terahertz pulses by optical rectification from a large-aperture ZnTe single crystal wafer. Energies up to 1.5 µJ per pulse and a spectral range extending to 3 THz were obtained using a 100 Hz Ti:Sapphire laser source and a 75-mm-diameter, 0.5-mm-thick, (110) ZnTe crystal, corresponding to an average power of 150 µW and an energy conversion efficiency 3.1E-5. We have also demonstrated real-time imaging of the focused terahertz beam using a pyroelectric infrared camera. Such a source can contribute to open up the field of nonlinear optics in the THz regime. In particular, we have recently shown the possibility of using open-aperture Z-scan like measurements to perform time resolved characterization in a n-doped InGaAs thin layer using intense few-cycle terahertz pulses. We observed a significant bleaching of the terahertz pulse absorption attributed to terahertz-electric-field-induced inter-valley carrier scattering. Dr. Roberto Morandotti, professor at INRS since 2003, has a broad knowledge in the fabrication of semiconductor, ferroelectric and glass integrated waveguides and in the use of various characterization techniques in optics. His main achievements to date are in nonlinear optics, where he has worked in the field of spatial and temporal nonlinear localizations, dealing in particular with discrete solitons, surface solitons and spatio-temporal light bullets. More recently, his research interests have broadened to encompass new topics of investigation, including linear and nonlinear magneto-optics and nonlinear THz Spetroscopy. He has served as the General Chair of the NP2007 OSA Topical Meeting, as a Program Chair for NLGW 2005 OSA Topical Meeting as well as a Sub-Committee Chair for various other OSA, SPIE, IEEE and LEOS meetings. Anyone interested in meeting with the speaker should contact Avi Zadok, [email protected] Tuesday, February 24th 4:00pm-5:00pm. Watson 104 Refreshments will be available in the Watson Lobby at 3:45pm .

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Low Power CW Nonlinear Optics in Silica Glass Photonic Integrated Circuit
A Review of New CMOS Material Platforms for Integrated Nonlinear Optics Roberto Morandotti INRS-EMT, 1650 Boulevard Lionel Boulet, Varennes, Québec, Canada, J3X 1S2 David J. Moss School of Electrical and Computer Engineering (SECE) RMIT University, Melbourne, Australia 3001 Alexander L. Gaeta School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA Michal Lipson School of Electrical and Computer Engineering, Cornell University, Ithaca, New York 14853, USA Nonlinear photonic chips have enabled the generation and processing of signals using only light, with performance far superior to that possible electronically - particularly with respect to speed. Although silicon-on-insulator has been the leading platform for nonlinear optics, its high two-photon absorption at telecommunications wavelengths poses a fundamental limitation. We review recent progress in non-silicon CMOS-compatible platforms for nonlinear optics, with a focus on Si3N4 and Hydex. These material systems have opened up many new capabilities such as on-chip optical frequency comb generation and ultrafast optical pulse generation and measurement. This review highlights their potential impact as well as the challenges to achieving practical solutions for many key applications. 1 Introduction All-optical signal generation and processing [1,2] have been highly successful at enabling a vast array of capabilities, such as switching and de-multiplexing of signals at unprecedented speeds [3,4], parametric gain [5] on a chip, Raman lasing [6], wavelength conversion [7], optical logic [8], all-optical regeneration [9,10], radio-frequency (RF) spectrometry at THz speeds [11,12], as well as entirely new functions such as ultra-short pulse measurement [13,14] and generation [15] on a chip, optical temporal cloaking [16], and many others.
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Micro-Combs: a Novel Generation of Optical Sources
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