Fabrication of microlens and microlens array using CO2 laser and characterization of formation process

2003 ◽  
Author(s):  
M. Wakaki ◽  
H. Fukumoto ◽  
H. Murotani ◽  
Y. Komachi ◽  
G. Kanai
Keyword(s):  
Co2 Laser ◽  
Formation Process ◽  
Microlens Array

Characterization of keyhole plasma in 20 kW-class CO2 laser welding

1999 ◽  
Author(s):  
Jay F. Tu ◽  
Isamu Miyamoto ◽  
Takashi Inoue ◽  
Etsuji Ohmura ◽  
Kazuhiko Ono ◽  
...  
Keyword(s):  
Laser Welding ◽  
Co2 Laser

Characterization of Tissue Microstructure Scatterer Distribution with Spectral Correlation

1993 ◽  
Vol 15 (3) ◽  
pp. 238-254 ◽  
Author(s):  
Tomy Varghese ◽  
Kevin D. Donohue
Keyword(s):  
Formation Process ◽  
Biological Tissue ◽  
Statistical Parameters ◽  
Spectral Correlation ◽  
Tissue Microstructure ◽  
Power Spectral ◽  
Spectral Peaks ◽  
Ultrasound Signal

Characterization of tissue microstructure from the backscattered ultrasound signal using the spectral autocorrelation (SAC) function provides information about the scatterer distribution in biological tissue. This paper demonstrates SAC capabilities in characterizing periodicities in A-scans due to regularity in the scatterer distribution. The A-scan is modelled as a cyclostationary signal, where the statistical parameters of the signal vary in time with single or multiple periodicities. This periodicity manifests itself as spectral peaks both in the power spectral density (PSD) and in the SAC. Periodicity in the PSD will produce a well defined dominant peak in the cepstrum, which has been used to determine the scatterer spacing. The relationship between the scatterer spacing and the spacing of the spectral peaks is established using a stochastic model of the echo-formation process from biological tissue. The distribution of the scatterers within the microstructure is modelled using a Gamma function, which offers a flexible method of simulating parametric regularity in the scatterer spacing. Simulations of the tissue microstructure for lower orders of regularity indicate that the SAC components reveal information about the scatterer spacing that are not seen in the PSD and the cepstrum. The echo-formation process is tested by simulating microstructure of varying regularity and analyzing their effect on the SAC, PSD and cepstrum. Experimental validation of the simulation results are provided using in vivo scans of the breast and liver tissue that show the presence of significant spectral correlation components in the SAC.

Characterization of Shilnikov Chaos in a CO2 Laser Containing a Saturable Absorber

1989 ◽  
pp. 299-302 ◽  
Author(s):  
D. Hennequin ◽  
M. Lefranc ◽  
A. Bekkali ◽  
D. Dangoisse ◽  
P. Glorieux
Keyword(s):  
Saturable Absorber ◽  
Co2 Laser

scholarly journals Growth and Characterization of Graphene on Polycrystalline SiC Substrate Using Heating by CO2 Laser Beam

2016 ◽  
Vol 19 (6) ◽  
pp. 1329-1334 ◽  
Author(s):  
Nierlly Karinni de Almeida Maribondo Galvão ◽  
Getúlio de Vasconcelos ◽  
Marcos Valentim Ribeiro dos Santos ◽  
Tiago Moreira Bastos Campos ◽  
Rodrigo Sávio Pessoa ◽  
...  
Keyword(s):  
Laser Beam ◽  
Co2 Laser

scholarly journals Colloidal lead iodide nanorings

Nanoscale ◽  
2018 ◽  
Vol 10 (45) ◽  
pp. 21197-21208 ◽  
Author(s):  
Eugen Klein ◽  
Leonard Heymann ◽  
Ana B. Hungria ◽  
Rostyslav Lesyuk ◽  
Christian Klinke
Keyword(s):  
Formation Process ◽  
Optical Measurements ◽  
Synthesis And Characterization ◽  
Lead Iodide ◽  
Ring Structures ◽  
Colloidal Lead ◽  
20 Nm

We present the synthesis and characterization of PbI2 nanorings prepared via a direct colloidal route. The ring structures are obtained by etching as prepared PbI2 nanosheets with trioctylphosphine and possess thicknesses between 20 nm and 85 nm and lateral dimensions of up to 10 μm. The formation process was analyzed and discussed as well as the electrical and optical measurements.

scholarly journals Characterization of the fast ionization wave induced by a CO2 laser pulse in argon

2019 ◽  
Vol 126 (24) ◽  
pp. 243304 ◽  
Author(s):  
Kohei Shimamura ◽  
Ippei Yokota ◽  
Shigeru Yokota
Keyword(s):  
Laser Pulse ◽  
Co2 Laser ◽  
Ionization Wave ◽  
Wave Induced

Surface modification and characterization of functional oxide ceramics using CO2 laser

2000 ◽  
Vol 169 (1-4) ◽  
pp. 6-11 ◽  
Author(s):  
Mamoru Okutomi ◽  
Haruhiko Nomura ◽  
Takeyo Tsukamoto ◽  
N.B. Dahotre ◽  
Honglie Shen
Keyword(s):  
Surface Modification ◽  
Co2 Laser ◽  
Oxide Ceramics
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