Creation of locally selective mirror surface on 40BaO–40TiO2–20B2O3 glass by XeCl pulse laser irradiation

2007 ◽  
Vol 22 (5) ◽  
pp. 1270-1274
Author(s):  
Hirokazu Masai ◽  
Shintaro Mizuno ◽  
Takumi Fujiwara ◽  
Yasuhiko Benino ◽  
Takayuki Komatsu ◽  
...  
Keyword(s):  
Absorption Coefficient ◽  
Laser Irradiation ◽  
Flat Surface ◽  
Present Finding ◽  
Mechanical Polishing ◽  
Ultraviolet Region ◽  
Present System ◽  
Xecl Laser ◽  
Pulse Laser Irradiation ◽  
Increasing Temperature

Creation of mirror dots, localized areas of smooth surface with a shape of laser beam on a glass material, using a XeCl laser irradiation is reported. Laser irradiation of a 40BaO–40TiO2–20B2O3 sample heated to 300 °C induced a smooth and flat surface, where no scratches caused by a mechanical polishing were observed. The present finding indicates that the melting of the surface occurred by the combined effect of the heat-assistance and the increased absorption coefficient of TiO2. In the present system, the absorption coefficient in the ultraviolet region, which originates from TiO2, was found to increase with increasing temperature. The presented technique will open new possibilities in integrated optics; the surface of a small protruded or hollow area can be made smooth, which cannot be achieved by conventional mechanical polishing.

Polarization-dependent Memory of Light via Ultrashort Pulse Laser Irradiation

PIERS Online ◽  
2008 ◽  
Vol 4 (2) ◽  
pp. 221-226
Author(s):  
Yasuhiko Shimotsuma ◽  
Masaaki Sakakura ◽  
Peter G. Kazansky ◽  
Jianrong Qiu ◽  
Kiyotaka Miura ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Pulse Laser ◽  
Ultrashort Pulse ◽  
Pulse Laser Irradiation ◽  
Ultrashort Pulse Laser

Study the Effect of Heat Treatment and Pressure on some the Optical Properties of the Pure PVA Nano Polymer

2021 ◽  
Vol 900 ◽  
pp. 16-25
Author(s):  
Tabarak Mohammed Awad ◽  
May A.S. Mohammed
Keyword(s):  
Heat Treatment ◽  
Dielectric Constant ◽  
Refractive Index ◽  
Optical Properties ◽  
Absorption Coefficient ◽  
Polyvinyl Alcohol ◽  
Complex Dielectric Constant ◽  
Different Temperatures ◽  
German Origin ◽  
Increasing Temperature

In this study, some optical properties were studied of the pure vinyl polyvinyl alcohol (PVA) nanopolymer (German origin). Under the influence of different temperatures and pressures of PVA. Where 25 samples were prepared for the purpose of conducting the research. Which studied the study of these samples was done by recording the absorbance and transmittance spectra of the wavelengths (200-900) nm. From them, absorbance, transmittance, reflectivity, absorption coefficient, refractive index, extinction coefficient, complex dielectric constant were calculated. At different temperatures (25,40, 80, 120, 160)°C. And with different pressures within the range (7.5,8,8.5,9,9.5) MPa. The results are that the permeability of the polymer (PVA) at different temperatures for each pressure decreases with increasing temperature, and that all other calculated optical properties increase with increasing temperature.

Nitride and Oxide Formation on Pure Metals by Pulse Laser Irradiation

1990 ◽  
Vol 29 (Part 1, No. 11) ◽  
pp. 2477-2480 ◽  
Author(s):  
Shigeto R. Nishitani ◽  
Hiroto Yamaoka ◽  
Masaharu Yamaguchi
Keyword(s):  
Laser Irradiation ◽  
Pulse Laser ◽  
Oxide Formation ◽  
Pulse Laser Irradiation ◽  
Pure Metals

Deposition of nitrides and oxides of aluminum and titanium by pulse laser irradiation

1992 ◽  
Vol 7 (3) ◽  
pp. 725-733 ◽  
Author(s):  
S.R. Nishitani ◽  
S. Yoshimura ◽  
H. Kawata ◽  
M. Yamaguchi
Keyword(s):  
Electron Microscopy ◽  
Laser Irradiation ◽  
Pulse Laser ◽  
Rutherford Backscattering Spectrometry ◽  
Metal Vapor ◽  
Pulse Laser Irradiation ◽  
X Ray ◽  
Transmission Electron ◽  
Ambient Gas ◽  
Scanning Electron

Deposits of nitrides and oxides of Al and Ti have been produced by laser irradiation of Al and Ti targets in air, N2, and NH3 + N2 gases. Microstructure and constituent phases in these deposits have been examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and x-ray diffractometry (XRD). The distribution of metalloid elements has been investigated by Rutherford backscattering spectrometry (RBS). On the basis of the results of these examinations, the nitride and oxide deposits have been shown to be formed by reactions between ambient gas and metal-melt or metal-vapor which take place during pulse laser irradiation.

Removal of Mechanical-Polishing-Induced Surface Damages on 4H-SiC by Chemical Etching and its Effect on Subsequent Epitaxial Growth

2015 ◽  
Vol 821-823 ◽  
pp. 541-544 ◽  
Author(s):  
Yong Zhao Yao ◽  
Yukari Ishikawa ◽  
Yoshihiro Sugawara ◽  
Koji Sato
Keyword(s):  
High Temperature ◽  
Epitaxial Growth ◽  
Chemical Etching ◽  
Flat Surface ◽  
Mechanical Polishing ◽  
Wet Etching ◽  
Surface Damages

To remove the surface damages induced during mechanical polishing (MP) of 4H-SiC, a variety of wet etching recipes and etching conditions were studied. By evaluating the epilayers grown on these etching-treated wafers, it has been found that triangular defects (TRDs) are the main defects originated from the MP-induced damages in these samples. High temperature molten KCl etching at 1100 °C with KOH additive is very effective to remove the damaged surface while keeping a relatively flat surface. Epilayer grown on the KCl+KOH etched wafer showed a TRD density <0.9 cm-2.

Planarization of Zinc Oxide Surface and Evaluation of Processing Damage

2011 ◽  
Vol 485 ◽  
pp. 215-218 ◽  
Author(s):  
Hiroki Miyazaki ◽  
Yutaka Adachi ◽  
Isao Sakaguchi ◽  
Takamasa Ishigaki ◽  
Naoki Ohashi
Keyword(s):  
Zinc Oxide ◽  
Flat Surface ◽  
Mechanical Polishing ◽  
Crystalline Quality ◽  
Polished Surface ◽  
Oxide Surface ◽  
High Crystalline Quality ◽  
Atomically Flat

The processes for polishing a ZnO surface were investigated with the aim of establishing a process for obtaining an atomically flat surface with high crystalline quality. The defects in a layer undergoing mechanical polishing were monitored through photoluminescence measurements, and the purity of the polished surface was characterized by SIMS. An atomicallyfishing process.

Electron microscopy of voids in Si formed by permeable pulse laser irradiation

2017 ◽  
Vol 66 (5) ◽  
pp. 328-336 ◽  
Author(s):  
Hiroyuki Iwata ◽  
Daisuke Kawaguchi ◽  
Hiroyasu Saka
Keyword(s):  
Electron Microscopy ◽  
Laser Irradiation ◽  
Pulse Laser ◽  
Pulse Laser Irradiation
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