PROIECT DE CERCETARE POSTDOCTORALA PD-160/2010
PROGRAMUL "RESURSE UMANE"

FINANTARE :                         CONSILIUL NATIONAL AL CERCETARII STIINTIFICE DIN INVATAMANTUL SUPERIOR (CNCSIS), BUCURESTI, ROMANIA
FUNDED BY:                         NATIONAL COUNCIL OF THE SCIENTIFIC RESEARCH IN UNIVERSITIES (CNCSIS), BUCHAREST, ROMANIA

DIRECTOR DE PROIECT:       Dr. Cristina GHEORGHE
PROJECT MANAGER:            Dr. Cristina GHEORGHE
Email: cristina.gheorghe@inflpr.ro

 

DURATA PROIECTULUI:            2010 - 2012
CONDUCATOR PROIECT:          INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU FIZICA LASERILOR, PLASMEI SI RADIATIEI INFLPR DIN BUCURESTI

OBIECTIVE
1. Efecte de structura si compozitie asupra proprietatilor spectrale si laser ale ionilor Sm³⁺ in cristalele Sr_1-xSm_yLa_x-yMg_xAl_12-xO₁₉ (ASL: Sm), 0 < x < 1 si y ≤ x.
1.1  Cresteri de cristale Sr_1-xSm_yLa_x-yMg_xAl_12-xO₁₉ cu domeniu extins de compozitie (0 < x < 1 si y ≤ x).
1.2. Masuratori spectroscopice de inalta rezolutie si determinarea parametrilor caracteristici.
1.3  Modelari fizico-matematice ale efectelor dezordinii, comparatii cu alte sisteme.
1.4  Studii de emisie laser in IR si vizibil a Sm³⁺ in ASL. Modelari de emisie, montaje si masuratori ale caracteristicilor emisiei laser (lungimi de unda, praguri, eficiente), pentru diferite probe ASL:Sm.

2. Studiul proprietatilor spectrale si laser a ionilor Sm³⁺ dopati in sesquioxizi ceramici de tip R₂O₃ unde R = Y, Lu, Sc.
2.1 Obtinerea prin sinteza in stare solida a materialelor ceramice R₂O₃ dopate cu ioni Sm³⁺ in diverse concentratii.
2.2 Caracterizarea prin difractie de raze X a materialelor ceramice obtinute.
2.3 Studiul proprietatilor structurale si morfologice prin microscopie electronica.
2.4 Masuratori spectroscopice de inalta rezolutie si determinarea parametrilor caracteristici functie de concentratia de ioni activi Sm³⁺.
2.5 Studii de emisie laser in IR si vizibil a Sm³⁺ in R₂O₃ ceramic. Modelari de emisie, montaje si masuratori ale caracteristicilor emisiei laser.

OBJECTIVES
1. Effects of structure and composition on spectral and laser properties of Sm³⁺ ions in crystals Sr_1-xSm_yLa_x-yMg_xAl_12-xO₁₉ (ASL: Sm), 0 < x < 1 si y ≤ x.
1.1 Growth of Sr_1-xSm_yLa_x-yMg_xAl_12-xO₁₉ crystals with extended field of composition (0 < x < 1 si y ≤ x).
1.2 High resolution spectroscopy measurements and determination of characteristic parameters.
1.3 Physical - mathematical modeling of disorder effects, comparison with other systems.
1.4 Studies of laser emission in IR and visible of Sm³⁺ in ASL. Emission modeling assembly and measurements of laser emission characteristics (wavelengths, thresholds, effective) for different ASL: Sm samples.

2. Study of spectral properties and laser of Sm³⁺ ions doped into R₂O₃ ceramic sesquioxides type where R = Y, Lu, Sc.
2.1 Obtaining by solid state reaction of R₂O₃ ceramic materials doped with different concentrations of Sm³⁺ ions.
2.2 Characterization by X-ray diffraction study of obtained materials.
2.3 Structural properties and morphological study by electron microscopy.
2.4 High resolution spectroscopy measurements and determination of characteristic parameters function of Sm³⁺ concentrations.
2.5 Studies of laser emission in IR and visible of Sm³⁺ in R₂O₃ ceramic. Emission modeling assembly and measurements of laser emission characteristics.

RESULTS
STAGE I. December 2010
1. C. Gheorghe, A. Lupei, L. Gheorghe, and A. Achim, “Growth and spectroscopic preliminary investigations of Sm³⁺ doped strontium hexa-aluminates single crystals,”
Optoelectronics and Advanced Materials - Rapid Communications 5 (2), 116-118 (2011).

STAGE II. December 2011:
A. 4 ISI papers:
1. C. Gheorghe, A. Lupei, V. Lupei, and L. Gheorghe, “A comparative study of Nd³⁺ and Sm³⁺ ions doped into oxide host materials; correlation between structure and spectral properties”, 
Optoelectronics and Advanced Materials - Rapid Communications 6 (1-2), 44-48 (2012). (with acknowledgements)
2. C. Gheorghe and L. Gheorghe, “Spectroscopic analysis and laser performance at 1.06 µm of Nd³⁺ doped Gd_1−xLu_xCa₄O(BO₃)₃ single crystal”, Journal of Applied  Physics 111 (1), 013102 (2012).
(without acknowledgements).
3. C. Gheorghe, A. Lupei, V. Lupei, A. Ikesue, and M. Enculescu, “Intensity parameters of Tm³⁺ doped Sc₂O₃ transparent ceramic laser material,” Opt. Mat. 33 (3), 501-505 (2011). (without acknowledgements)
4. A. Lupei, V. Lupei, C. Gheorghe, A. Ikesue, and M. Enculescu, “Spectroscopic characteristics of Dy³⁺ doped Y₃Al₅O₁₂ transparent ceramics,” J. Appl. Phys. 110, 083120 (2011).
5. A. Lupei, V. Lupei, C. Gheorghe, and A. Ikesue, “Spectroscopic investigation of Sm³⁺ in YAG ceramic,” Rom. Reports Phys. 63 (3), 817-822 (2011). (without acknowledges)

B. Other publications:
1. F. Voicu, C. Gheorghe, C. Florica, “Preliminary study in preparation of Nd³⁺: YAG and Sm³⁺: Y₂O₃ transparent ceramics”, CMP-P38, The Annals of the West University of Timisoara
(accepted for publication; with acknowledgements). 

C. 3 communications at International Conferences:
CI. IBWAP - 2011, International Balkan Workshop on Applied Physics, 06-08 Julie 2011, Constanta, Romania, http://www.univ-ovidius.ro/ibwap2011/home.htm
1. C. Gheorghe, A. Lupei, L. Gheorghe, A. Achim, and F. Voicu, “Preliminary spectroscopic investigations of Sm³⁺ doped ASL single crystals”, P42/S1, poster presentation.

CII. TIM 2011, 24 - 27 November 2011, Timisoara, Romania, http://www.physics.uvt.ro/~tim_11/program.php
1. F. Voicu, C. Gheorghe, and C. Florica, “Preliminary study in preparation of Nd³⁺: YAG and Sm³⁺: Y₂O₃ transparent ceramics”, CMP-P38, poster presentation.
2. C. Gheorghe, A. Lupei, and F. Voicu, “Sm³⁺- doped Sc₂O₃ polycrystalline ceramics: spectroscopic investigation”, CMP-P12, poster presentation.

STAGE III. July 2012:
a) 1 ISI paper:
1. C. Gheorghe, A. Lupei, F. Voicu, M. Enculescu, “Sm³⁺- doped Sc₂O₃ polycrystalline ceramics: spectroscopic investigation,” Journal of Alloys and Compounds 535, 78-82 (2012) (with acknowledgements).

b) 1 communication at International Conferences:
1. F. Voicu, C. Gheorghe, and A. Crisan, “Preparation of Nd³⁺:YAG and Sm³⁺: Sc₂O₃ transparent ceramics,” International Student Conference on Photonics 2012, SPIE Student Chapter, 8-11 May 2012,
Sinaia, Romania. Book of abstracts, ISSN 2284-9750, p. 71.