Concerning the articles "destruction of transparent polymers by laser beams" and "fracture under cubic compression of polymethyl methacrylate subject to laser radiation"

1974 ◽  
Vol 7 (4) ◽  
pp. 688-688
Author(s):  
N. P. Novikov
Keyword(s):  
Laser Radiation ◽  
Polymethyl Methacrylate ◽  
Laser Beams ◽  
Transparent Polymers

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.

Laser-induced damage to transparent polymers: chemical effect of short-pulsed (Q-switched) Nd:YAG laser radiation on ophthalmic acrylic biomaterials

Biomaterials ◽  
1990 ◽  
Vol 11 (5) ◽  
pp. 313-320 ◽  
Author(s):  
Traian V Chirila ◽  
Graham D Barrett ◽  
Albert V Russo ◽  
Iau J Constable ◽  
Paul P van Saarloos ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Nd:Yag Laser ◽  
Chemical Effect ◽  
Laser Induced Damage ◽  
Transparent Polymers

Ultrafast Imaging of Ultraviolet Laser Ablation and Etching of Polymethyl Methacrylate

1989 ◽  
Vol 158 ◽  
Author(s):  
Bodil Braren ◽  
R. Srinivasan ◽  
Kelly G. Casey ◽  
Mildred Yeh
Keyword(s):  
Laser Radiation ◽  
Polymethyl Methacrylate ◽  
Initial Velocity ◽  
Average Velocity ◽  
Solid Material ◽  
Low Molecular Weight ◽  
Molecular Weight Polymer ◽  
Ultrafast Imaging ◽  
Visible Laser ◽  
Modification Of The Surface

ABSTRACTAblation and etching of the surface of polymethyl methacrylate (=PMMA) by pulses of 248 nm laser radiation ∼20 ns full width at half maximum (FWHM) have been probed by pulses of visible laser radiation (596 nm; < 1 ns FWHM). The results were recorded photographically in real time with a set time delay between the 248 nm ablation pulse and the 596 nm probe pulse. Modification of the surface structure of the polymer at a fluence ∼ 3 J/cm2 is first visible at 12 ns and appears to be complete in ∼ 60 ns. The first manifestation of the ablation does not occur until the UV pulse is over and consists of a nearly transparent shock-wave that has an initial velocity of 6 ∼ 104 cm/sec. Solid material from the ablated zone begins to leave the surface at ∼150 - 200 ns and reaches a maximum in intensity at 6 µs, continuing for ∼ 20 µs. The average velocity of the solid material, which is probably a low molecular weight polymer of PMMA, is 1.5 ∼ 104 cm/sec. The conclusion to be drawn from the present work is that the signal measured by photoacoustic detectors does not coincide with the bulk of the material leaving the surface.

Study of mechanical properties of aluminum, AMg6M alloy, and polymethyl methacrylate at high strain rates under the action of picosecond laser radiation

2012 ◽  
Vol 57 (2) ◽  
pp. 64-66 ◽  
Author(s):  
S. A. Abrosimov ◽  
A. P. Bazhulin ◽  
V. V. Voronov ◽  
I. K. Krasyuk ◽  
P. P. Pashinin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Laser Radiation ◽  
Polymethyl Methacrylate ◽  
High Strain ◽  
Picosecond Laser ◽  
Strain Rates ◽  
High Strain Rates

scholarly journals An interference scheme for generating inhomogeneously polarized laser radiation using a spatial light modulator

2020 ◽  
Vol 44 (2) ◽  
pp. 214-218 ◽  
Author(s):  
S.V. Karpeev ◽  
V.V. Podlipnov ◽  
A.M. Algubili
Keyword(s):  
Laser Radiation ◽  
Phase Transformations ◽  
Optical System ◽  
Spatial Light Modulator ◽  
Laser Beams ◽  
Light Modulator ◽  
Optical Setup ◽  
Linearly Polarized ◽  
Polarization Phase ◽  
Cylindrical Vector Beam

An optical system for converting linearly polarized laser beams into cylindrical vector beams is developed and experimentally investigated. The scheme is based on the coherent addition of mode beams using a Mach-Zehnder interferometer. The simplicity and versatility of the optical setup is achieved through the use of different sections in the area of the spatial light modulator for the si-multaneous generation of two spatially separated given mode beams. Each of the beams then propagates in one of the arms of the interferometer and undergoes the necessary polarization-phase transformations to obtain a cylindrical vector beam after the addition of mode beams.

Features of the Polymethyl Methacrylate Destruction Process by Various Types of Dynamic Loading

2021 ◽  
Vol 899 ◽  
pp. 473-478
Author(s):  
B.I. Kunizhev ◽  
A.M. Kugotova ◽  
Z.S. Torshhoeva ◽  
Ruslan A. Shetov
Keyword(s):  
Comparative Analysis ◽  
Laser Radiation ◽  
Polymethyl Methacrylate ◽  
Dynamic Loading ◽  
High Speed ◽  
Laser Action ◽  
Initial Energy ◽  
Destruction Process ◽  
Energy Characteristics ◽  
Similarities And Differences

The paper presents a comparative analysis of the dynamic loading of a polymethyl methacrylate (PMMA) target by a polyethylene (PE) projectile exposed to laser radiation with similar initial energy characteristics of the projectile and the laser pulse. The similarities and differences in the mechanisms of the target's response and its destruction to high-speed mechanical and laser action are shown. A higher efficiency of laser irradiation in the destruction of PMMA was found, and the conditions for the transition of the fracture mechanism from brittle to elastic-plastic were shown.

scholarly journals Can Self-focusing of Intense Laser Beams Cause Bose -Einstein Condensation in to a Superfluid State ?

1989 ◽  
Vol 44 (3) ◽  
pp. 243-244 ◽  
Author(s):  
F. Winterberg
Keyword(s):  
Refractive Index ◽  
Laser Radiation ◽  
Intense Laser ◽  
Laser Beams ◽  
Einstein Condensation ◽  
Superfluid State ◽  
Bose Einstein Condensation ◽  
Self Focusing ◽  
Intense Laser Radiation ◽  
Bose Einstein

Abstract The cause of the phenomenon of self-focusing of intense laser radiation in solids is the nonlinear inten­ sity dependent refractive index [1] n = nl + n 2E2, (1)

An Investigation of the Effect of Laser Radiation on the Dielectric Parameters of Polymethyl Methacrylate

2018 ◽  
Vol 45 (5) ◽  
pp. 205-207
Author(s):  
Z.S. Torshkhoeva ◽  
A.S. Akhriev ◽  
B.I. Kunizhev
Keyword(s):  
Laser Radiation ◽  
Dielectric Loss ◽  
Dielectric Permittivity ◽  
Laser Pulse ◽  
Polymethyl Methacrylate ◽  
Loss Tangent ◽  
Dielectric Loss Tangent ◽  
Pulse Treatment ◽  
Dielectric Parameters ◽  
Temperature Range

The effect of laser radiation on the dielectric parameters of polymethyl methacrylate at a frequency of 50 kHz in the 170–420 K temperature range was investigated. It was shown that the laser pulse treatment of specimens leads to considerable changes in their dielectric permittivity and dielectric loss tangent.

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