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The paper illustrates the design of two pumping schemes for Mid-IR lasers based on photonic crystal fibers (PCFs) made of dysprosium doped chalcogenide glass Dy3+:Ga5Ge20Sb10S65. The simulation is performed by taking into account the spectroscopic parameters measured on the rare earth-doped glass sample in order to perform a realistic feasibility investigation. The first pump scheme provides an optical...
Third-order nonlinear optical phenomena have been intensively studied in integrated structures of crystalline silicon, Hydex, and silicon nitride for different applications, from classical to quantum photonics. As any other material, also porous silicon PSi is characterized by a third-order nonlinear response. Previous works have focused mainly on third-harmonic generation or two-photon absorption...
In this work, we analyze the influence of the nanocrystallization process on the luminescence properties of Er3+ ions in transparent oxyfluoride tellurite glass-ceramics obtained by heat treatment of the precursor Er-doped glass. The comparison between the fluorescence properties of Er-doped glass and glass-ceramics suggests that a fraction of Er3+ ions are forming nanocrystals while the rest remain...
We discuss the numerical modelling of lanthanide-ion doped chalcogenide glass fibre lasers for operation in the mid-infrared wavelength region. We extract the modelling parameters from emission and absorption measurements using Judd-Ofelt and McCumber theory. Numerical algorithms are developed based on the experimentally extracted fibre parameters. The simulation results predict lasing with slope...
The paper reports the characterization of a dysprosium doped ZBLAN fiber amplifier intended to be used in mid infrared applications. Using a single-frequency 1064-nm laser pump with 1.5 W, two different fiber lengths were characterized for their losses, coupling efficiency, absorption and enhancement.
We have investigated experimentally and theoretically four-wave mixing (FWM) in hot potassium vapor as a medium for producing slow and store light. Two pump and a single probe photon were mixed in double-Λ system, characterized by parametric amplification of coupled co-propagating probe and conjugate beams. We have observed very high gains of probe and conjugate, up to 60 and 80 respectively, at two...
We report random laser action, for the first time to our knowledge, in crystalline powders of LiLa1−xNdxP4O12 (x = 0.5 and 1) by using a pulsed Ti-sapphire pumping. The effect of grain size on slope efficiency and threshold energy is investigated. The absolute slope efficiencies are similar for all samples studied whereas the lowest threshold pump energy corresponds to the stoichiometric sample with...
Spatial-resolved light delivery in the living mammalian brain is of utmost importance in optogenetics experiments, since it allows for combining cell-type specificity with spatial selective optical control of neural activity. This can be achieved at sub-cellular resolution in first cortical layers with two-photon microscopy, while sub-cortical regions can be accessed by using waveguide-based devices...
Whispering gallery mode resonators have the essential property to trap photons by total internal reflection. When manufactured with ultra-low loss crystals, they can feature an exceptionally high quality factor. The confinement of long-lifetime photons in the bulk resonator enhances nonlinear light-matter interactions such as Brillouin, Raman, and Kerr scattering. In this communication, we investigate...
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