8:30am - 8:45amSpectroscopy of Ho:Y2O3 transparent ceramics: Effect of YF3 addition
Florian Delaunay1, Ngoc Quynh Hoa Nguyen2, Nathan Kerkad1, Rémy Boulesteix1, Pavel Loiko2, Alain Braud2, Patrice Camy2, Véronique Jubéra3, Alexandre Maître1
1Univ. Limoges, IRCER, UMR CNRS 7315, 87068 Limoges, France; 2CIMAP, UMR 6252 CEA-CNRS-ENSICAEN, Université de Caen Normandie, France; 3L’Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Bordeaux INP, Université de Bordeaux, UMR 5026 CNRS, 33600 Pessac, France
Transparent ceramics of Holmium-doped yttria (Ho:Y2O3) were fabricated by Hot Isostatic Pressing at 1720 °C / 190 MPa in argon, and the effect of YF3 addition on their microstructure, optical, vibronic and infrared emission properties was studied. The fluorine addition improves the ceramic transparency, accelerates the grain growth and enhances the luminescence lifetimes of Ho3+ states responsible for emissions at 2 µm and 3 µm.
8:45am - 9:00amMeasurements of laser properties of organic semiconductors to predict organic laser thresholds
Mouhamadou Lamine Coly, Alexis A.P.A FISCHER, Azzedine BOUDRIOUA, Amani OURIMI, Mahmoud CHAKAROUN, Nixson LOGANATHAN, Daan LENSTRA
Université Sorbonne Paris Nord, France
In the context of the quest of organic laser diode, we propose a method to compare organic gain semiconductors in terms of laser threshold before integrating them into laser cavity. This method is based on three types of measurements for each material: 1-measurements of absorption and photoluminescence spectra to evaluate the re-absorption, 2-measurement of fluorescence lifetimes linking the potential laser gain to the current in the diode and 3-measurement of the gain of the amplified spontaneous emission. This approach is validated by laser threshold measurements carried out under optical pumping for two organic compounds DCM and DCJTB deposited on laser cavities
9:00am - 9:15amMid-infrared emissions of Dy3+ ions in CaF2
Ngoc Quynh Hoa Nguyen1, Pavel Loiko1, Abdelmjid Benayad1, Aleksey Kornienko2, Elena Dunina2, Liudmila Fomicheva3, Patrice Camy1, Alain Braud1
1CIMAP, UMR 6252 CEA-CNRS-ENSICAEN, Université de Caen Normandie, France; 2Vitebsk State Technological University, 72 Moskovskaya Ave., 210035 Vitebsk, Belarus; 3Belarusian State University of Informatics and Radioelectronics, 6 Brovka St., 220027 Minsk, Belarus
We report on a comprehensive spectroscopic study of singly Dy3+ doped and Er3+,Dy3+ codoped calcium fluoride (CaF2) crystals for midinfrared laser applications. The f-f transition probabilities of Dy3+ were determined by the Judd-Ofelt theory. The stimulated-emission cross-section reaches 0.25×10-20 cm2 at 2.93 µm corresponding to an emission bandwidth of 350 nm. The Er3+ → Dy3+ energy transfer efficiency in codoped crystals is quantified. The 4.4-µm Dy3+ emission is observed for the first time from fluorite crystals.
9:15am - 9:30amDiffusion doping of LN wafers for rare earth and optically damage-resistant ion doped LNOI
Sonja Schnippering, Kore Hasse, Sergiy Suntsov, Detlef Kip
Helmut Schmidt University Hamburg, Germany
Surface-doping of lithium niobate wafers with rare earth or optically damage-resistant ions by physical vapour deposition and high-temperature in-diffusion is a cost-efficient and flexible method for the fabrication of thin-film LN or LNOI with dopants which are not common in crystal growth. LNOI doped with different concentrations of Er, Yb, Tm, Pr, Zn and Zr has been fabricated. As an example, the fluorescence spectra of Er:Yb:LNOI samples were recorded, and a high small-signal gain of 35 dB/cm was measured in ridge waveguides.
9:30am - 9:45amLuminescent concentrators from visible to SWIR range and focus on the Ni2+-doped crystals
Nicolas Caraud1, Francois Balembois2, Pascal Loiseau1, Bruno Viana2
1PSL University, CNRS, ChimieParisTech, France; 2Université Paris-Saclay, IOGS, CNRS, Laboratoire Charles-Fabry, 91127 Palaiseau, France
The objective of this work is to design a secondary luminescent concentrator (LC) -optically pumped by a YAG:Ce primary luminescent concentrator- then emitting photons between 1.0 and 1.5 µm in the SWIR. The main properties should be a good overlap of the absorption spectrum with the YAG:Ce emission, a high quantum efficiency value for the Ni2+ emission, and a good optical quality of the crystal to limit losses. Ni2+ doped lasers crystal such as LaMgAl11O19:Ni and YAlO3:Ni or LiGa5O8:Ni glass-ceramics can be proposed and are investigated within this work.
9:45am - 10:00amSpectroscopy of low-phonon-energy Er:La2O2S oxysulfide
Marine Poitou1, Simone Normani2, Pavel Loiko2, Alain Braud2, Patrice Camy2, Odile Merdrignac-Conanec1
1Institut des Sciences Chimiques de Rennes (ISCR), CNRS UMR 6226, Université de Rennes 1, F-35000 Rennes, France; 2Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), UMR 6252 CEA-CNRS-ENSICAEN, Université de Caen Normandie, 6 Boulevard Maréchal Juin, 14050 Caen, France
Lanthanum oxysulfide powders doped with Erbium ions were fabricated by the combustion method followed by sulfurization at 1000 °C under H2S + N2 atmosphere. X-ray diffraction confirms their single-phase nature (sp. gr. P-3m1). Raman spectroscopy reveals a maximum phonon energy of 389 cm-1. The effect of Er3+ doping level (0.5 – 7 mol%) on the visible and mid-infrared emission properties of Er:La2O2S was studied.
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