scholarly journals The Investigation on Mid-Far Infrared Nonlinear Crystal AgGaGe5Se12 (AGGSe)

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 661
Author(s):  
Youbao Ni ◽  
Qianqian Hu ◽  
Haixin Wu ◽  
Weimin Han ◽  
Xuezhou Yu ◽  
...  
Keyword(s):  
Nonlinear Crystal ◽  
Maximum Output Power ◽  
Frequency Doubling ◽  
Damage Threshold ◽  
Far Infrared ◽  
Maximum Output ◽  
X Ray Diffraction ◽  
Rocking Curve ◽  
Ir Transmission ◽  
Laser Induced Damage

3–5, 8–14 μm mid-far infrared (MF-IR) coherent lights generated by nonlinear optical (NLO) crystals are crucial for many industrial and military applications. AgGaGe5Se12 (AGGSe) is a promising NLO candidate because of its good optical performance. In this paper, the large AGGSe single crystal of 35 mm diameter and 80 mm length was obtained by the seed-aided Bridgman method. The crystalline quality was characterized with X-ray diffraction, rocking curve, transmission spectrum. The FWHM of the (210) peak was about 0.05° and the IR transmission was about 60% (1–10 μm, 6 mm thick). Additionally, it performed well in 8 μm frequency doubling, with a maximum output power of about 41 mW, corresponding to an optical-to-optical conversion efficiency of 3.2%. The laser induced damage threshold (LIDT) value was about 200 MW/cm2 (1.06 μm, 20 ns, 1 Hz).

Phase Matching, Strong Frequency Doubling, and Outstanding Laser-Induced Damage Threshold in the Biaxial, Quaternary Diamond-like Semiconductor Li4CdSn2S7

2020 ◽  
Vol 32 (23) ◽  
pp. 10045-10054
Author(s):  
Jian-Han Zhang ◽  
Stanislav S. Stoyko ◽  
Andrew J. Craig ◽  
Pedro Grima ◽  
Joshua W. Kotchey ◽  
...  
Keyword(s):  
Frequency Doubling ◽  
Damage Threshold ◽  
Phase Matching ◽  
Laser Induced Damage

scholarly journals Preparation, Characterization and Intermediate-Temperature Electrochemical Properties of Er3+-Doped Barium Cerate–Sulphate Composite Electrolyte

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2752
Author(s):  
Fufang Wu ◽  
Ruifeng Du ◽  
Tianhui Hu ◽  
Hongbin Zhai ◽  
Hongtao Wang
Keyword(s):  
Maximum Output Power ◽  
Nitrogen Atmosphere ◽  
Maximum Output ◽  
Barium Cerate ◽  
X Ray Diffraction ◽  
Ac Impedance Spectroscopy ◽  
Raman Spectrometry ◽  
Composite Electrolyte ◽  
X Ray ◽  
Doped Barium Cerate

In this study, BaCe0.9Er0.1O3−α was synthesized by a microemulsion method. Then, a BaCe0.9Er0.1O3−α–K2SO4–BaSO4 composite electrolyte was obtained by compounding it with a K2SO4–Li2SO4 solid solution. BaCe0.9Er0.1O3−α and BaCe0.9Er0.1O3−α–K2SO4–BaSO4 were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectrometry. AC impedance spectroscopy was measured in a nitrogen atmosphere at 400–700 °C. The logσ~log (pO2) curves and fuel cell performances of BaCe0.9Er0.1O3−α and BaCe0.9Er0.1O3−α–K2SO4–BaSO4 were tested at 700 °C. The maximum output power density of BaCe0.9Er0.1O3−α–K2SO4–BaSO4 was 115.9 mW·cm−2 at 700 °C, which is ten times higher than that of BaCe0.9Er0.1O3−α.

scholarly journals Influence of the Characteristics of Multilayer Interference Antireflection Coatings Based on Nb, Si, and Al Oxides on the Laser-Induced Damage Threshold of ZnGeP2 Single Crystal

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1549
Author(s):  
Nikolai Nikolayevich Yudin ◽  
Mikhail Zinoviev ◽  
Vladislav Gladkiy ◽  
Evgeny Moskvichev ◽  
Igor Kinyaevsky ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Nonlinear Crystal ◽  
Ion Beam ◽  
Damage Threshold ◽  
Antireflection Coating ◽  
Coated Sample ◽  
Antireflection Coatings ◽  
Ion Beam Sputtering ◽  
Incident Laser Radiation ◽  
Laser Induced Damage

In this work, the effect of the defect structure and the parameters of antireflection interference coatings based on alternating layers of Nb2O5/Al2O3 and Nb2O5/SiO2 layers on the laser-induced damage threshold of ZGP crystals under the action of Ho:YAG laser radiation at a wavelength of 2.097 μm was determined. Coating deposition was carried out using the ion-beam sputtering method. The laser-induced damage threshold of the sample with a coating based on alternating layers Nb2O5 and SiO2 was W0d = 1.8 J/cm2. The laser-induced damage threshold of the coated sample based on alternating layers of Nb2O5 and Al2O3 was W0d = 2.35 J/cm2. It has been found that the presence of silicon conglomerates in an interference antireflection coating leads to a decrease in the laser-induced damage threshold of a nonlinear crystal due to local mechanical stresses and the scattering of incident laser radiation.

Growth of a bulk-size single crystal of sulphamic acid by an in-house developed seed rotation solution growth technique and its characterization

2017 ◽  
Vol 50 (3) ◽  
pp. 763-768 ◽  
Author(s):  
Sonia ◽  
N. Vijayan ◽  
Medha Bhushan ◽  
Kanika Thukral ◽  
Rishabh Raj ◽  
...  
Keyword(s):  
Single Crystal ◽  
Wavelength Region ◽  
Damage Threshold ◽  
Thermal Parameter ◽  
X Ray Diffraction ◽  
Growth Technique ◽  
Rocking Curve ◽  
X Ray ◽  
Rotation Technique ◽  
Sulphamic Acid

A bulk sulphamic acid single crystal has been grown by a modified seed rotation technique. The lattice dimensions of the grown single crystal were confirmed using powder X-ray diffraction, and it was found that it crystallized in an orthorhombic structure with space groupPbca. The strain in the lattice was calculated by the Williamson–Hall equation. The crystalline perfection was examined by high-resolution X-ray diffraction and found to be extremely good (the single peak of the rocking curve having an FWHM of ∼8.0′′). The luminescence behaviour was recorded in the wavelength region between 400 and 630 nm using an Xe flash lamp which acts as an excitation source. The shock damage threshold was measured for the grown crystal in order to determine the mechanical capability of the title compound. The thermal parameter of sulphamic acid was calculated by photoacoustic spectroscopy.

Unileg Thermoelectric Module Comprised by Coated Halide-Perovskite Thin Film

2020 ◽  
Vol 142 (7) ◽  
Author(s):  
Shrikant Saini ◽  
Ajay Kumar Baranwal ◽  
Tomohide Yabuki ◽  
Shuzi Hayase ◽  
Koji Miyazaki
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Seebeck Coefficient ◽  
Room Temperature ◽  
Maximum Output Power ◽  
Thermoelectric Module ◽  
Direct Conversion ◽  
Maximum Output ◽  
X Ray Diffraction ◽  
X Ray

Abstract The direct conversion of thermal energy into electricity is possible by thermoelectric effect. CsSnI3 perovskite has shown a way with its intrinsic ultralow thermal conductivity and large Seebeck coefficient. In this work, CsSnI3 thin films were optimized. Thin films were structurally and chemically characterized using X-ray diffraction (XRD) and scanning electron microscope (SEM). Thermoelectric properties such as electrical conductivity, Seebeck coefficient, and thermal conductivity were measured near room temperature (300 K). CsSnI3 thin films unileg thermoelectric modules were fabricated on a glass substrate. The maximum output power is obtained about 0.8 nW for five legs (25 mm × 3 mm × 600 nm) modules for the temperature difference of about 5 °C.

X-ray diffraction properties of curved crystal diffractors

1992 ◽  
Vol 50 (2) ◽  
pp. 1734-1735
Author(s):  
W. Z. Chang ◽  
D. B. Wittry
Keyword(s):  
Diffraction Theory ◽  
X Rays ◽  
Diffraction Image ◽  
X Ray Diffraction ◽  
Rocking Curve ◽  
X Ray ◽  
Bent Crystal ◽  
Diffraction Geometry ◽  
Crystal Parameter ◽  
Quantitative Procedure

Since Du Mond and Kirkpatrick first discussed the principle of a bent crystal spectrograph in 1930, curved single crystals have been widely utilized as spectrometric monochromators as well as diffractors for focusing x rays diverging from a point. Curved crystal diffraction theory predicts that the diffraction parameters - the rocking curve width w, and the peak reflection coefficient r of curved crystals will certainly deviate from those of their flat form. Due to a lack of curved crystal parameter data in current literature and the need for optimizing the choice of diffraction geometry and crystal materials for various applications, we have continued the investigation of our technique presented at the last conference. In the present abstract, we describe a more rigorous and quantitative procedure for measuring the parameters of curved crystals.The diffraction image of a singly bent crystal under study can be obtained by using the Johann geometry with an x-ray point source.

Characterization of microwave-sintered ceramic composites

1993 ◽  
Vol 51 ◽  
pp. 1136-1137
Author(s):  
X. Zhang ◽  
Y. Pan ◽  
T.T. Meek
Keyword(s):  
Matrix Material ◽  
Maximum Output Power ◽  
Ceramic Matrix Composite ◽  
Ceramic Composites ◽  
Processing Technique ◽  
Structure Characterization ◽  
Alumina Powder ◽  
Maximum Output ◽  
Sintered Ceramic

Industrial microwave heating technology has emerged as a new ceramic processing technique. The unique advantages of fast sintering, high density, and improved materials properties makes it superior in certain respects to other processing methods. This work presents the structure characterization of a microwave sintered ceramic matrix composite.Commercial α-alumina powder A-16 (Alcoa) is chosen as the matrix material, β-silicon carbide whiskers (Third Millennium Technologies, Inc.) are used as the reinforcing element. The green samples consisted of 90 vol% Al2O3 powder and 10 vol% ultrasonically-dispersed SiC whiskers. The powder mixture is blended together, and then uniaxially pressed into a cylindrical pellet under a pressure of 230 MPa, which yields a 52% green density. The sintering experiments are carried out using an industry microwave system (Gober, Model S6F) which generates microwave radiation at 2.45 GHz with a maximum output power of 6 kW. The composites are sintered at two different temperatures (1550°C and 1650°C) with various isothermal processing time intervals ranging from 10 to 20 min.

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