Dissertation > Excellent graduate degree dissertation topics show

Study of the Growth and Performance of Holmium-doped BaY2F8Crystals

Author: LiQinLin
Tutor: JiangXiaoGuang
School: Changchun University of Science and Technology
Course: Materials Engineering
Keywords: 3~5μm laser Coprecipitation method Czochralski method Ho:BaY2F8crystal
CLC: O781
Type: Master's thesis
Year: 2014
Downloads: 1
Quote: 0
Read: Download Dissertation

Abstract


Holmium-doped yttrium barium fluoride laser crystal (MF:Ho:BaY2F8, referred Ho:BYF) is a potential mid-infrared laser crystal materials, through889nm titanium sapphire laser pumped laser can emit3.9βm.3-5βm band laser has a strong penetrating power, small gas molecules absorption and scattering ratio of suspended solids, water and other hydrocarbon molecules having a large absorption of toxic molecules, etc. It has been widely used in military combat, medical surgery, toxic gas detection and other areas.In this paper, Ho:BaY2F8polycrystalline materials were synthesized by co-precipitation method. Single crystals of BaY2F8heavily doped with Ho3+ion (10%and30%) were grown by the medium-frequency induction Czochralski method. The prepared NCs powders were characterized by X-ray diffraction (XRD), TG-DSC, FI-IR, SEM, etc. The physical and optical properties of Single crystals were characterized by X-ray fluorescence spectrometer, thermal and mechanical properties tester, spectrophotometer, fluorescence spectroscopy, etc.The results indicate that above550℃after sintering, Ho:BYF powder was synthesized by co precipitation of cubic phase transferred to the monoclinic; Different doping concentration Ho:BYF lattice parameter changes, as the doping concentration the increase in unit cell volume is reduced. Scanning electron microscopy analysis indicated that sintering treatment at650℃for2h,the sample showed partial melting, uniform particle size, particle distribution uniform conducive fluoride sintered polycrystalline material. Thermo-mechanical performance analysis shows, a crystal axis direction with minimal expansion coefficient, absorption spectra indicates that the crystal has a strong absorption peak at889nm, The four Ho3+absorption bands corresponding to the5I8→5I4,5I5,5I6, and5I7transitions exhibit increasing band intensity on going from short wavelength to long wavelength. Ho:BYF crystals were pumped889nm titanium sapphire laser, emitting3.9βm wavelength fluorescence.

Related Dissertations

  1. The Research on Preparation Technology and Sintering Behavior of Rare Earth Aluminates (Dy3Al5O12、 NdAlO3、LaAl11O18),TB383.3
  2. Study on Synthesis and Magnetism of Flake Shaped BaFe12O19,TB383.1
  3. La 0.5 Sr 0.5 Preparation and Characterization MnO 3 perovskite -type oxides,O611.4
  4. Synthesis and Luminescent Properties of ZnSe Quantum Dots,O614.241
  5. The Study on Dislocation Pattern and Hardness of Germanium Single Crystal for GaAs Space Solar Cells,O782
  6. Preparation of Nano BaTiO3 and TiO2,TB383.1
  7. Growth and Performance Research of Tm, Ho:BaY2F8 Crystal,O782
  8. Study on the Growth and Propetiles of Yb:LiYF4 Laser Crystal,O782
  9. Yttrium-doped calcined hydrotalcite acetone Preparation and catalytic synthesis of isophorone copper,O621.36
  10. Piezoelectric transformer with Mg: LN Preparation and properties of single crystals,O782
  11. Study on Defect Structure and Photorefractive Properties of Lithium Niobate Doped with Ruthenium and Iron,O77
  12. The Study on the Growth and Crystallization Habits of YVO4 Crystals,O782
  13. Preparation, Characterization and Performance of LiFePO4/C with Composite Carbon Sources for Lithium-ion Batteries,TM912
  14. Numerical Simulation of Heat, Momentum and Mass Transport in LEC Growth of GaAs Crystal,TK124
  15. Preparation and Evaluation of Copper-based Catalyst for Methanol Synthesis via CO2 Hydrogenation,TQ223.121
  16. Growth and Properties of Lithium Tantalum Doped with Fe,O782
  17. Study on the Growth and Properties of Stoichiometric Lithium Niobate Doped with Cu,O782
  18. Doped Yb ~ (3): Ca_3Ga_2Ge_3O_ (12) crystal growth and spectral characteristics of,O782
  19. Growth and Properties of Nd:CNGG and Nd:CLNGG Disordered Laser Crystals,TN244
  20. Growth and Properties of Series Re:YCOB Crystals,O782
  21. Study on Nd:GGG Solid-State Heat-Capacity Laser Crystal and Growth Technology,O782.6

CLC: > Mathematical sciences and chemical > Crystallography > Crystal growth > Theories of crystal growth
© 2012 www.DissertationTopic.Net  Mobile