RELATIONSHIP BETWEEN MICRO-STRUCTURE AND LASER DAMAGE THRESHOLD OF NANO-ZrO2 FILMS

2005 ◽  
Vol 19 (01n03) ◽  
pp. 585-587 ◽  
Author(s):  
L. H. DUAN ◽  
A. P. LIU ◽  
S. L. CHEN ◽  
W. L. WANG ◽  
P. MA ◽  
...  
Keyword(s):  
Electron Beams ◽  
Damage Threshold ◽  
Amorphous Structure ◽  
Laser Damage Threshold ◽  
Laser Damage ◽  
X Ray Diffraction ◽  
Micro Structure ◽  
Polycrystalline Structure ◽  
Coating Materials ◽  
X Ray

In this paper, the micro-structure and laser damage threshold of nano- ZrO 2 thin films were investigated. High-purity nano- ZrO 2 particles as the coating materials of samples were prepared by the electron beams evaporation. The micro-structure and crystallitic size of samples were analyzed by X-ray diffraction, a laser by 1064nm, 10ns, 3Hz Nd:YAG laser damage test each for nano- ZrO 2 films. The results showed that oxygen partial pressure has an important influence on the micro-structure of nano- ZrO 2 films, also found that the crystallitic size and different micro-structure influenced the laser damage threshold. The obtained results showed that laser damage threshold of polycrystalline structure is obviously higher than that of amorphous structure.

Structural, Optical and Laser Damage Threshold Studies of 1, 10 Phenanthraline Doped Potassium Penta Borate (KB5) Single Crystals

2012 ◽  
Vol 584 ◽  
pp. 29-32
Author(s):  
K. Prabha ◽  
M. Ramesh Babu ◽  
Pappu Sagayaraj
Keyword(s):  
Grown Crystal ◽  
Damage Threshold ◽  
Laser Damage Threshold ◽  
Laser Damage ◽  
Solvent Evaporation Method ◽  
X Ray Diffraction ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters

We concentrate on the low temperature slow solvent evaporation method and characterization of pure and 1, 10 phenanthraline doped KB5 and describe its potential as a non-linear optical material. The grown crystal has been subjected to single crystal X-ray diffraction analysis to identify the unit cell parameters and crystal system. The presence of carbon, hydrogen and oxygen content were confirmed by CHN analysis. The Kurtz’s-Perry powder SHG efficiency was determined for both pure and 1, 10 phenanthraline doped KB5 crystals as 1.6 and 2.2 times than that of pure KDP. Laser damage threshold studies of the pure and doped KB5 crystals have been found to be Q-Switched Nd-YAG laser.

Laser Damage Threshold of Hydrophobic Up-Conversion Carboxylated Nanocellulose/SrF2:Hо Composite Films Functionalized With 3-Aminopropyltriethoxysilane

2021 ◽  
Author(s):  
Anna A. Luginina ◽  
Sergey V. Kuznetsov ◽  
Vladimir K. Ivanov ◽  
Valery V. Voronov ◽  
Alexey D. Yapryntsev ◽  
...  
Keyword(s):  
Cellulose Nanofibrils ◽  
Damage Threshold ◽  
Nanocomposite Films ◽  
Laser Damage Threshold ◽  
Laser Damage ◽  
Homogeneous Distribution ◽  
Scanning Calorimetry ◽  
Long Distance ◽  
Oh Groups ◽  
X Ray

Abstract Luminescent nanocomposite films, containing SrF 2 :Но up-conversion particles, were prepared by two different protocols from aqueous dispersions of TEMPO-oxidized cellulose nanofibrils (TOCNF) functionalized with 3-aminopropyltriethoxysilane (APS) without the use of organic solvents at pH = 4.0-4.5 and 9.0-9.5, respectively. Proposed synthetic protocols included formation of the films by drying the dispersions containing pre-hydrolyzed APS adsorbed onto TOCNF and SrF 2 :Но particles followed by heating at 105 °C. Hydrophobic (water contact angle 101 ± 2°), strong, and translucent TOCNF/SrF 2 :Но-APS films were prepared by casting from a solution at pH = 4.0-4.5. Scanning electron microscopy, energy-dispersive X-ray spectroscopy with element mapping, Fourier-transform infrared spectroscopy, X-ray diffraction methods confirmed homogeneous distribution of up-conversion particles in TOCNF matrices as well as the grafting of linear polysiloxanes via the condensation of silanol groups and OH-groups on the surface of TOCNF. Differential scanning calorimetry and thermogravimetry data confirmed an increase in thermal stability of the APS modified nanocomposite films obtained at pH = 4.0-4.5. Hydrophobic TOCNF/SrF 2 :Но-APS nanocomposite films exhibited an intense red luminescence in the visible spectrum range ( 5 I 7 level excitation of Ho 3+ ions with 1912 nm laser irradiation) as well as two-times higher laser damage threshold compared to unmodified TOCNF/SrF 2 :Но films. TOCNF/SrF 2 :Но films can be used for visualization 2 μm laser radiation in medicine and long-distance atmosphere monitoring.

Preparation and Properties of Alkali Stimulated Geopolymer and its Application in Thermal Insulation Coating

2011 ◽  
Vol 233-235 ◽  
pp. 2443-2446 ◽  
Author(s):  
Liang Chen ◽  
Wei Han ◽  
Zhen Li ◽  
Tao Wei ◽  
Cheng Jing Xiao
Keyword(s):  
Thermal Insulation ◽  
Volume Ratio ◽  
Amorphous Structure ◽  
Insulation Material ◽  
X Ray Diffraction ◽  
Micro Structure ◽  
Surface Protection ◽  
X Ray ◽  
Insulation Coating ◽  
Promising Application

Geopolymer was prepared by Metakaolin (MK) stimulated by sodium silicate and sodium hydroxide. X-Ray diffraction (XRD) and scanning electron microscope (SEM) were used to characterize micro-structure of geopolymer and geopolymer based coating. A serial of reagents were added to modify the coating and a thermal insulation material was produced. It was revealed that MK has quasi-crystal structure and the produced geopolymers had amorphous structure. The surface of geopolymer based coating, as well as the compressive strength, adhesive strength with concrete, could be modified by adding a certain amount of silane coupling agent, mica powders and wollastonite. By mixing the asprepared geopolymer and hollow glass beads with a volume ratio of 4:1, a thermal inslation coating was produced, which had a promising application in the surface protection of hydropower dam.

Unidirectional growth and characterization of L-tartaric acid single crystals

2013 ◽  
Vol 46 (4) ◽  
pp. 993-998 ◽  
Author(s):  
K. Moovendaran ◽  
S. Natarajan
Keyword(s):  
Single Crystals ◽  
Tartaric Acid ◽  
Second Harmonic ◽  
Nir Spectroscopy ◽  
Damage Threshold ◽  
Laser Damage Threshold ◽  
Solution Technique ◽  
X Ray Diffraction ◽  
Second Harmonic Generation Efficiency ◽  
X Ray

Single crystals of L-tartaric acid (LTA), an organic nonlinear optical material, have been grown using a home-built crystal growth setup (the Moovendaran–Kalyanasundar–Natarajan setup). Crystals of LTA were also grown by the slow evaporation solution technique. These single crystals were characterized using single-crystal X-ray diffraction, high-resolution X-ray diffraction, and IR and UV–Vis–NIR spectroscopy. In addition, measurements of Vickers microhardness, laser damage threshold value and second harmonic generation efficiency are reported. Thermal, dielectric and photoluminescence studies were also carried out.

Enhancement of second harmonic generation efficiency, laser damage threshold and optical properties of cobalt chloride doped with L-alanine single crystal

2016 ◽  
Vol 25 (02) ◽  
pp. 1650017 ◽  
Author(s):  
I. Cicili Ignatius ◽  
S. Rajathi ◽  
K. Kirubavathi ◽  
K. Selvaraju
Keyword(s):  
Optical Properties ◽  
Single Crystal ◽  
Cobalt Chloride ◽  
Damage Threshold ◽  
Optical Transmittance ◽  
Laser Damage Threshold ◽  
Laser Damage ◽  
Cutoff Wavelength ◽  
Second Harmonic Generation Efficiency ◽  
X Ray

In the present study, L-alanine crystal is grown with cobalt chloride as dopant by low temperature solution growth using slow evaporation technique at room temperature. The lattice parameters of the grown pure and cobalt chloride doped L-alanine crystals were determined by the single crystal X-ray diffraction technique. The presence of the elemental composition such as cobalt chloride present in the L-alanine lattice was confirmed by energy dispersive X-ray analysis. The optical transmittance, absorbance, reflectance was measured and used to study the optical properties of the pure and doped L-alanine crystal. The pure L-alanine crystal has high optical transmittance in the whole visible range and UV transparency with lower cutoff wavelength at 240[Formula: see text]nm. By adding cobalt chloride to L-alanine crystal, the transmittance decreases the value of cutoff shifts to the higher wavelengths. Nonlinear optical studies reveal that the SHG efficiency and laser damage threshold energy increases when the L-alanine crystal is doped with cobalt chloride. From microhardness studies, it is observed that the cobalt chloride doped L-alanine crystal is harder than the pure crystal.

Growth of Ethyl-Para-Hydroxybenzoate Single Crystal and its Characterization

2012 ◽  
Vol 584 ◽  
pp. 121-125 ◽  
Author(s):  
N. Karunagaran ◽  
P. Ramasamy
Keyword(s):  
Single Crystal ◽  
Diffraction Analysis ◽  
Grown Crystal ◽  
Vickers Microhardness ◽  
Damage Threshold ◽  
Laser Damage Threshold ◽  
Solution Technique ◽  
Slow Evaporation ◽  
X Ray Diffraction ◽  
X Ray

Ethyl-para-hydroxybenzoate (EHB) single crystals have been grown by slow evaporation solution technique (SEST) using methanol as a solvent. The grown crystal was subjected to single crystal X-ray diffraction analysis, confirming that the crystal belongs to monoclinic structure. The grown crystal was characterized by powder X-ray diffraction analysis. The functional groups present in the EHB crystal have been identified using FTIR spectrum analysis. The laser damage threshold of EHB crystal was measured. The mechanical strength of the grown EHB crystal was measured using Vickers microhardness, no cracks have been observed up to 100 g of load. The optical transparency of the grown EHB crystal has been measured by UV-Vis-NIR spectrophotometer. The refractive index of grown EHB single crystal is 1.6610. The dielectric permittivity and dielectric loss of the EHB single crystal were studied as function of frequency and temperature. The thermogravimetric analysis (TG) and differential thermal analysis (DTA) were studied. The melting point of EHB was 123°C. The luminescence behavior of EHB single crystal has been analyzed by photoluminescence analysis.

Bulk Laser Damage Threshold and Stimulated Raman Scattering in KTiOPO4 Crystal.

1996 ◽  
Vol 24 (8) ◽  
pp. 906-909
Author(s):  
Akio MIYAMOTO ◽  
Hidetsugu YOSHIDA ◽  
Yusuke MORI ◽  
Takatomo SASAKI ◽  
Sadao NAKAI
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Damage Threshold ◽  
Laser Damage Threshold ◽  
Laser Damage ◽  
Stimulated Raman
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