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您的检索式：作者名="Yannick LEDEMI"
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| 1 | Nonlinear increase,invisibility,and sign inversion of a localized fs-laser-induced refractive index change in crystals and glasses显示文摘Multiphoton absorption via ultrafast laser focusing is the only technology that allows a three-dimensional structural modification of transparent materials.However,the magnitude of the refractive index change is rather limited,preventing the technology from being a tool of choice for the manufacture of compact photonic integrated circuits.We propose to address this issue by employing a femtosecond-laser-induced electronic band-gap shift(FLIBGS),which has an exponential impact on the refractive index change for propagating wavelengths approaching the material electronic resonance,as predicted by the Kramers–Kronig relations.Supported by theoretical calculations,based on a modified Sellmeier equation,the Tauc law,and waveguide bend loss calculations,we experimentally show that several applications could take advantage of this phenomenon.First,we demonstrate waveguide bends down to a submillimeter radius,which is of great interest for higher-density integration of fs-laser-written quantum and photonic circuits.We also demonstrate that the refractive index contrast can be switched from negative to positive,allowing direct waveguide inscription in crystals.Finally,the effect of the FLIBGS can compensate for the fs-laser-induced negative refractive index change,resulting in a zero refractive index change at specific wavelengths,paving the way for new invisibility applications. | Jerome Lapointe Jean-Philippe Berube Yannick Ledemi Albert Dupont Vincent Fortin Younes Messaddeq Real Vallee | 2020 | Light(Science & Applications)2020，9，1： | 2 |
| 2 | Photonic properties of novel Yb3+ doped germanium-lead oxyfluoride glass-ceramics for laser cooling applications显示文摘 | Lauro J. Q. MAIA Jyothis THOMAS Yannick LEDEMI Kummara V. KRISHNAIAH Denis SELETSKIY Younes MESSADDEQ Raman KASHYAP | 2018 | Frontiers of Optoelectronics2018，11，2： | 0 |
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