Continuous wave terahertz phase imaging

2010 ◽  
Author(s):  
Wenfeng Sun ◽  
Xinke Wang ◽  
Ye Cui ◽  
Yan Zhang
Keyword(s):  
Continuous Wave ◽  
Phase Imaging

Continuous wave terahertz phase imaging with three-step phase-shifting

Optik ◽  
2013 ◽  
Vol 124 (22) ◽  
pp. 5533-5536 ◽  
Author(s):  
Wenfeng Sun ◽  
Xinke Wang ◽  
Yan Zhang
Keyword(s):  
Continuous Wave ◽  
Phase Shifting ◽  
Phase Imaging

Multi-layered full-field phase imaging using continuous-wave terahertz ptychography

2020 ◽  
Vol 45 (6) ◽  
pp. 1391
Author(s):  
Dayong Wang ◽  
Bing Li ◽  
Lu Rong ◽  
Fangrui Tan ◽  
John J. Healy ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Phase Imaging ◽  
Field Phase ◽  
Full Field

Continuous-wave terahertz phase imaging using a far-infrared laser interferometer

2011 ◽  
Vol 50 (35) ◽  
pp. 6452 ◽  
Author(s):  
Yingxin Wang ◽  
Ziran Zhao ◽  
Zhiqiang Chen ◽  
Li Zhang ◽  
Kejun Kang ◽  
...  
Keyword(s):  
Laser Interferometer ◽  
Continuous Wave ◽  
Far Infrared ◽  
Infrared Laser ◽  
Phase Imaging ◽  
Far Infrared Laser

Microstructures of Laser Processed Fe-Cr Surface Alloys

1981 ◽  
Vol 39 ◽  
pp. 328-329
Author(s):  
P. A. Molian ◽  
K. H. Khan ◽  
W. E. Wood
Keyword(s):  
Cooling Rate ◽  
Pure Iron ◽  
Continuous Wave ◽  
Laser Surface ◽  
Material Surface ◽  
Constitution Diagram ◽  
Incident Power ◽  
Surface Alloying ◽  
Laser Surface Alloying ◽  
Spot Diameter

In recent years, the effects of chromium on the transformation characteristics of pure iron and the structures produced thereby have been extensively studied as a function of cooling rate. In this paper, we present TEM observations made on specimens of Fe-10% Cr and Fe-20% Cr alloys produced through laser surface alloying process with an estimated cooling rate of 8.8 x 104°C/sec. These two chromium levels were selected in order to study their phase transformation characteristics which are dissimilar in the two cases as predicted by the constitution diagram. Pure iron (C<0.01%, Si<0.01%, Mn<0.01%, S=0.003%, P=0.008%) was electrodeposited with chromium to the thicknesses of 40 and 70μm and then vacuum degassed at 400°F to remove the hydrogen formed during electroplating. Laser surface alloying of chromium into the iron substrate was then performed employing a continuous wave CO2 laser operated at an incident power of 1200 watts. The laser beam, defocussed to a spot diameter of 0.25mm, scanned the material surface at a rate of 30mm/sec, (70 ipm).

1848: Revolix 70 Watt 2 Micron Continuous Wave Laser Vaporesection of the Prostate. Preliminary Results After a One Year Follow-Up

2007 ◽  
Vol 177 (4S) ◽  
pp. 614-614
Author(s):  
Thorsten Bach ◽  
Thomas R.W. Herrmann ◽  
Roman Ganzer ◽  
Andreas J. Gross
Keyword(s):  
Continuous Wave ◽  
Continuous Wave Laser ◽  
Preliminary Results ◽  
Wave Laser ◽  
One Year

Leitlinien zur peripheren Gefäßdiagnostik mit der direktionalen continuous-wave (CW) Doppler-Sonographie

Phlebologie ◽  
2000 ◽  
Vol 29 (05) ◽  
pp. 142-145
Author(s):  
T. Hertel ◽  
B. Kahle ◽  
H. G. Kluess ◽  
M. Marshall ◽  
E. Rabe ◽  
...  
Keyword(s):  
Continuous Wave

Investigating the Nonlinear Optical Response of Pepper Oil under Low Power Irradiation with Continuous Wave Visible Laser Beam

2020 ◽  
pp. 131-138
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Nonlinear Optical ◽  
Continuous Wave ◽  
Diffraction Integral ◽  
Visible Laser ◽  
Limiting Property ◽  
Kirchhoff Diffraction Integral ◽  
Theoretical Results ◽  
Good Agreement

The nonlinear optical properties of pepper oil are studied by diffraction ring patterns and Z-scan techniques with continuous wave beam from solid state laser at 473 nm wavelength. The nonlinear refractive index of the sample is calculated by both techniques. The sample show high nonlinear refractive index. Based on Fresnel-Kirchhoff diffraction integral, the far-field intensity distributions of ring patterns have been calculated. It is found that the experimental results are in good agreement with the theoretical results. Also the optical limiting property of pepper oil is reported. The results obtained in this study prove that the pepper oil has applications in nonlinear optical devices.

Velocity Window for Detection of Flow with MR Phase Imaging

1996 ◽  
Vol 34 (6) ◽  
pp. 729
Author(s):  
Tae Hwan Lim ◽  
Nuno J Tavares ◽  
Nola M Hylton ◽  
Charles B Higgins
Keyword(s):  
Phase Imaging
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