Experimental study of the effect of ultraviolet laser radiation on pulmonary, tracheal, and bronchial tissue

1989 ◽  
Vol 107 (5) ◽  
pp. 647-649
Author(s):  
A. L. Vladimirtseva ◽  
A. P. Ettinger ◽  
E. Ya. Gatkin ◽  
Yu. V. Golubenko
Keyword(s):  
Experimental Study ◽  
Laser Radiation ◽  
Ultraviolet Laser ◽  
Bronchial Tissue

Photoablation Studies of Polymers, Quartz, and Semiconductors with Vacuum Ultraviolet Laser Radiation

1991 ◽  
Vol 236 ◽  
Author(s):  
Peter R. Herman ◽  
Boyi Chen ◽  
David J. Moore ◽  
Mark Canaga-Retnam
Keyword(s):  
Laser Radiation ◽  
Polymethyl Methacrylate ◽  
Thermal Damage ◽  
Vacuum Ultraviolet ◽  
Medical Industry ◽  
Surface Melting ◽  
Excimer Lasers ◽  
Ultraviolet Laser ◽  
Low Threshold ◽  
Microelectronics Industry

AbstractExcimer lasers sources of 193nm and 157 nm wavelength were used to obtain new photoablation etching rates for several materials of interest to the microelectronics industry. The harder 157nm radiation provided lower ablation rates and smaller threshold fluences for Polyimide and Polymethyl Methacrylate (PMMA) than with 193nm. For normally robust materials like quartz and Teflon (PTFE), the 157nm laser produced clean and smooth ablation sites with low threshold fluences of 620mJ/cm2 and 68mJ/cm2, respectively, features impossible to obtain with conventional excimer lasers at longer wavelengths. The data should help define new micromachining applications of these two materials for the electronic, optical or medical industry. Results are also reported for GaAs and InP based materials which are found to undergo moderate etch rates of 30-80nm/pulse at fluences of ∼3J/cm2, but suffer thermal damage and material segregation due to surface melting.

Deep Ultraviolet Laser Radiation Causes Brittle Fracture of C α ‐C β Bonds in Neurotransmitters

2019 ◽  
Vol 4 (18) ◽  
pp. 5235-5239
Author(s):  
Guanhua Yang ◽  
Haiming Wu ◽  
Anthony M. S. Pembere ◽  
Zhixun Luo
Keyword(s):  
Laser Radiation ◽  
Brittle Fracture ◽  
Ultraviolet Laser ◽  
Deep Ultraviolet

scholarly journals Formation of microcrystals under the influence of femtosecond laser radiation on carbon samples in liquid nitrogen

2019 ◽  
Vol 220 ◽  
pp. 02005
Author(s):  
Kirill Khorkov ◽  
Dmitry Kochuev ◽  
Anton Chernikov ◽  
Valery Prokoshev ◽  
Sergey Arakelian
Keyword(s):  
Experimental Study ◽  
Laser Radiation ◽  
Liquid Nitrogen ◽  
Subsurface Layer ◽  
Laser Action ◽  
Target Surface ◽  
Femtosecond Laser Radiation ◽  
Carbon Target ◽  
Direct Laser ◽  
Temperature And Pressure

In this paper, we present the results of an experimental study of the carbon microcrystals formation by direct laser action on the carbon target surface at temperature of liquid nitrogen. It is demonstrated that the formation of microcrystals occurs in the subsurface layer and is caused by the achievement of critical temperature and pressure.

Interaction of ultraviolet laser radiation with a XeCl laser

1985 ◽  
Vol 2 (6) ◽  
pp. 925 ◽  
Author(s):  
D. B. Geohegan ◽  
A. W. McCown ◽  
J. G. Eden
Keyword(s):  
Laser Radiation ◽  
Xecl Laser ◽  
Ultraviolet Laser

A Mechanistic Study of the Interaction of Ultraviolet Laser Radiation with Low Density Polymers

1986 ◽  
Vol 75 ◽  
Author(s):  
Philip J. Hargis
Keyword(s):  
Laser Radiation ◽  
Laser Fluence ◽  
Emission Spectra ◽  
Mechanistic Study ◽  
Etch Depth ◽  
Low Density ◽  
Foam Density ◽  
Absorption Mechanism ◽  
Linear Absorption ◽  
Ultraviolet Laser

AbstractUltraviolet laser radiation at 248 nm and 266 nm was used to ablate low density (0.04 to 0.14 g/cm3) microcellular polystyrene and TPX foams at laser fluences between 0.1 and 1000 J/cm2, The dependence of the etch rate on laser fluence and foam density is consistent with a linear absorption mechanism for the initial stages of polystyrene ablation. Studies of the morphology and chemical composition of the ablated foams as a function of laser fluence and foam density show that the degree of melting increases at the higher foam densities. Blackbody and radical specie contributions to optical emission from the ablated foam were readily resolved for correlation with laser fluence, foam density, absorption spectra, and etch depth. Temperatures in excess of 3000 °K are calculated from emission spectra observed during the ablation of polystyrene foams. From this data we conclude that chemical and thermal changes in the ablated foam are influenced by the absorption spectrum as well as the density of the foam.

Multiphoton ionization of CF3I clusters by ultraviolet laser radiation

2011 ◽  
Vol 112 (1) ◽  
pp. 1-9 ◽  
Author(s):  
V. M. Apatin ◽  
V. N. Lokhman ◽  
D. D. Ogurok ◽  
D. G. Poydashev ◽  
E. A. Ryabov
Keyword(s):  
Laser Radiation ◽  
Multiphoton Ionization ◽  
Ultraviolet Laser
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