Effect of Laser Spot Diameter on the Reproducibility of Visual Field Analysis in Diabetic Patients with Upper Temporal Retinal Vein Occlusion

2008 ◽  
Vol 222 (2) ◽  
pp. 64-68
Author(s):  
Yusuf Akar ◽  
K. Cemil Apaydin ◽  
Mehmet Metinsoy
Keyword(s):  
Visual Field ◽  
Retinal Vein Occlusion ◽  
Field Analysis ◽  
Laser Spot ◽  
Diabetic Patients ◽  
Spot Diameter ◽  
Vein Occlusion ◽  
Laser Spot Diameter

Bending Deformation of Pure Titanium Plate in CO2 Laser Forming

2007 ◽  
Vol 329 ◽  
pp. 625-630 ◽  
Author(s):  
Koichi Okuda ◽  
Y. Sugie ◽  
Masayuki Nunobiki
Keyword(s):  
Co2 Laser ◽  
Laser Power ◽  
Pure Titanium ◽  
Laser Spot ◽  
Laser Forming ◽  
Titanium Plate ◽  
Bending Angle ◽  
Spot Diameter ◽  
Bending Deformation ◽  
Laser Spot Diameter

This study deals with behaviour of bending deformation in CO2 laser forming process of titanium. CO2 laser forming technique was applied for a pure titanium plate with thickness of 1 mm to aim the development of new bending process. The experiments of laser forming were carried out with a CO2 laser machine. The bending angle and the temperature of workpiece were examined under the condition of various laser power, feed speed and laser spot diameter. Based on the experimental results, it was found that the bending deformation behaved greatly depending on the laser power and the laser spot diameter. The bending angle increased with an increase in the laser power. The bending direction tended to change from the laser irradiation side to its opposite side when the large laser spot diameter was applied.

Analysis and comparison of semiconductor materials processed at IR vs. UV laser wavelengths for DRAM yield enhancement applications

2005 ◽  
Vol 890 ◽  
Author(s):  
Andy E. Hooper ◽  
Allen Kawasaki ◽  
Paul Kirby ◽  
Robert Hainsey ◽  
Jeongho Bang ◽  
...  
Keyword(s):  
Laser Energy ◽  
Yield Enhancement ◽  
Laser Spot ◽  
Semiconductor Layer ◽  
Semiconductor Materials ◽  
Uv Laser ◽  
Spot Diameter ◽  
Materials Used ◽  
Laser Spot Diameter

ABSTRACTThis report demonstrates the effects of IR and UV laser energy on common semiconductor layer stack materials used for DRAM laser fuses. By moving from IR to UV wavelengths it is possible to significantly shrink the laser spot diameter from ∼1.6 μm to 0.8 μm. Effects and concerns for the absorption of UV energy by Si, SiO2, nitrides, and oxynitrides are also presented.

Visual Field Defect After Radial Optic Neurotomy for Central Retinal Vein Occlusion

2006 ◽  
Vol 50 (2) ◽  
pp. 158-160 ◽  
Author(s):  
Akitaka Tsujikawa ◽  
Masanori Hangai ◽  
Masashi Kikuchi ◽  
Kazuhiro Ishida ◽  
Yasuo Kurimoto
Keyword(s):  
Visual Field ◽  
Retinal Vein Occlusion ◽  
Central Retinal Vein Occlusion ◽  
Visual Field Defect ◽  
Radial Optic Neurotomy ◽  
Vein Occlusion ◽  
Field Defect ◽  
Central Retinal Vein

Simulation of Drilling Micro-Hole by a Dual CO2 Laser Beam Irradiated Sticking Plaster

2012 ◽  
Vol 203 ◽  
pp. 519-522
Author(s):  
Zhi Ming Rao ◽  
Xian Bo Xiao ◽  
Zhi Fang He
Keyword(s):  
Laser Beam ◽  
Co2 Laser ◽  
Laser Power ◽  
Laser Spot ◽  
Beam Power ◽  
Analysis Software ◽  
Element Analysis ◽  
Spot Diameter ◽  
Micro Hole ◽  
Laser Spot Diameter

We explore a simulation model of drilling micro-hole in sticking plaster heated with a dual CO2 laser beam. This paper applied numerical simulation of temperature by using finite element analysis software Ansys to study a model of drilling on sticking plaster. A dual CO2 laser spot sizes ranged from 0.15 to 0.2mm radius with axial irradiance power levels of 50-100w. For temperatures above 450°C, sticking plaster would be vaporized. The size of ventilation holes changed with beam power and laser spot diameter. The width of the hole is increases with the increasing laser diameter and with the increasing laser power. These results can guide to laser drilling experiments.

Influence of Laser Spot Diameter on Cladding Layer Cracking

2015 ◽  
Vol 52 (3) ◽  
pp. 031401 ◽  
Author(s):  
付福兴 Fu Fuxing ◽  
畅庚榕 Chang Gengrong ◽  
赵小侠 Zhao Xiaoxia ◽  
张艳丽 Zhang Yanli
Keyword(s):  
Laser Spot ◽  
Spot Diameter ◽  
Cladding Layer ◽  
Laser Spot Diameter

Influence of the laser-spot diameter on photo-ablation rates

1995 ◽  
Vol 60 (1) ◽  
pp. 13-17 ◽  
Author(s):  
B. Wolff-Rottke ◽  
J. Ihlemann ◽  
H. Schmidt ◽  
A. Scholl
Keyword(s):  
Laser Spot ◽  
Spot Diameter ◽  
Photo Ablation ◽  
Laser Spot Diameter

Visual Field Changes in Branch Retinal 'Vein' Occlusion

1976 ◽  
Vol 94 (5) ◽  
pp. 747-754 ◽  
Author(s):  
C. H. Birchall ◽  
G. S. Harris ◽  
S. M. Drance ◽  
I. S. Begg
Keyword(s):  
Visual Field ◽  
Retinal Vein Occlusion ◽  
Branch Retinal Vein Occlusion ◽  
Vein Occlusion

Does Type II Diabetes Predispose to Retinal Vein Occlusion?

1993 ◽  
Vol 3 (3) ◽  
pp. 109-113 ◽  
Author(s):  
P.M. Dodson ◽  
C.G. Clough ◽  
S.M. Downes ◽  
E.E. Kritzinger
Keyword(s):  
Retinal Vein Occlusion ◽  
Type I Diabetes ◽  
Microvascular Complications ◽  
Control Group ◽  
Diabetic Patients ◽  
Type I ◽  
Type Ii ◽  
Medical Conditions ◽  
Vein Occlusion ◽  
Diabetic Microvascular Complications

Retinal vein occlusion (RVO) not infrequently occurs in diabetic patients. Although the aetiology is unclear, it could relate to the other microvascular complications of diabetes. In the non-diabetic, both the central (CRVO) and branch (BRVO) forms are commonly associated with hypertension and hyperlipidaemia. We have therefore studied fifty type II diabetic patients with RVO compared to a carefully matched diabetic control group (n = 50) to elucidate underlying medical conditions and hence the aetiology of RVO in diabetic patients. The two groups were well matched. Diabetics with RVO showed a strikingly high prevalence of hypertension compared to the controls (72% versus 32%: p < 0.001) and a trend to increased hyperlipidaemia (54% versus 36%). Diabetic microvascular complications were more common in the control group (diabetic retinopathy and proteinuria). No significant differences were observed in mean HbA1 or weight, but current smoking habits and blood pressure levels were increased in the diabetics with RVO. 80% of diabetic patients with the BRVO form, were hypertensive. We conclude that the main underlying medical conditions for RVO in diabetics are hypertension and hyperlipidaemia, and these may be important in the aetiology as in the non-diabetic. RVO is more common in type II rather than type I diabetes, and does not associate with the presence of diabetic microvascular complications. Clinical assessment for hypertension and hyperlipidaemia is therefore important in diabetic patients with RVO, especially if recurrence of the condition and further visual loss is to be prevented.

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