Preparation of polythiophene thin films by UV laser-assisted deposition of 2,5-dichlorothiophene with a 248 nm excimer laser beam

1998 ◽  
Vol 116 (3) ◽  
pp. 245-249 ◽  
Author(s):  
Satoru Nishio ◽  
Shin-ichi Okada ◽  
Yae Minamimoto ◽  
Motoyoshi Okumura ◽  
Akiyoshi Matsuzaki ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Beam ◽  
Excimer Laser ◽  
Uv Laser

The Accuracy of Micro-molds Produced by a UV Laser Induced Polymerization

1994 ◽  
Vol 116 (3) ◽  
pp. 370-376 ◽  
Author(s):  
K. Yamaguchi ◽  
T. Nakamoto ◽  
P. A. Abbay ◽  
S. Mibu
Keyword(s):  
Thin Films ◽  
Aspect Ratio ◽  
Laser Beam ◽  
High Aspect Ratio ◽  
Research Work ◽  
Practical Method ◽  
High Accuracy ◽  
Uv Laser ◽  
Ultraviolet Laser ◽  
Absorption Of Light

This research work deals with the development of a simple and practical method for manufacturing metallic micromachine parts on the order of 0.01–1.0 mm in size. In this method, an ultraviolet laser beam is irradiated onto the surface of a liquid photopolymer material through a mask. The irradiated pattern is then developed to produce a solidified photopolymer mold. Finally, the metallic part is made by an electroforming process. This paper deals with the first process, the making of the photopolymer mold. At first, the accuracy of the mold is estimated by applying the theories of diffraction and absorption of light. Next, the accuracy is examined experimentally. The results show an accuracy of ± 1 μm can be obtained when a proximity transfer of 10 μm between the mask and the photopolymer surface is used. By stacking thin films, thick and high aspect ratio molds with a reasonably high accuracy are made.

UV laser beam/YBCO target interaction for optimum preablation for the growth of YBCO thin films

1998 ◽  
Author(s):  
C. Andreouli ◽  
S. Christoulakis ◽  
Tom Efthimiopoulos ◽  
Athena Tsetsekou ◽  
M. Holiastou ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Beam ◽  
Uv Laser ◽  
Target Interaction ◽  
Ybco Thin Films

Comparison of CW and Pulsed UV Laser Etching of LiNbO3

1988 ◽  
Vol 129 ◽  
Author(s):  
K.W. Beeson ◽  
N.S. Clements
Keyword(s):  
Lithium Niobate ◽  
Laser Beam ◽  
Excimer Laser ◽  
Uv Laser ◽  
Laser Etching ◽  
Argon Ion Laser ◽  
Ion Laser ◽  
Argon Ion

ABSTRACTThe results of CW frequency-doubled argon-ion laser etching and pulsed excimer laser etching of lithium niobate (LiNbO3) are compared. Argon-ion laser etching occurs in the presence of Cl2 at laser intensities of 1.1 MW/cm2 or higher. The 257 nm laser beam with up to 25 mW power is focused to a 1.5 μm diameter spot and scanned at speeds of 10 μm/s or less. Excimer laser etching is done at 248 nm (KrF) with the laser beam focused onto the sample with cylindrical optics. Trenches <20 μm wide and several millimeters long are produced by ablating the target and without scanning the beam. Excimer laser etching of lithium niobate has been attempted in the presence of C12, O2, N2, H2 or air. Excellent results are obtained with air as the etching medium.

Microfabrication of Polymers Using KrF Excimer Laser Beam

2006 ◽  
Vol 326-328 ◽  
pp. 115-118
Author(s):  
Dong Sig Shin ◽  
Jae Hoon Lee ◽  
Jeong Suh
Keyword(s):  
Laser Ablation ◽  
Binding Energy ◽  
Laser Beam ◽  
Excimer Laser ◽  
Polymer Chains ◽  
Laser Beams ◽  
Adhesive Tape ◽  
Uv Laser ◽  
Laser Process ◽  
Krf Excimer Laser

Pulsed UV laser beams, which are widely used in the processing of polymers, offer many advantages in the field of polymer production, primarily because their photon energy is higher than the binding energy of the polymer. In particular, the fabrication of polymers with an excimer laser process is faster and more convenient than with other processes. Nevertheless, some problems occur in the precision microprocessing of polymers, including the formation and deposition of surface debris, which is produced from the breakdown of either polymer chains or radical bonds. In the present work, a process for eliminating carbonized surface debris contamination generated by the laser ablation of a polymer was developed. The proposed approach for removing surface debris utilizes an erasable ink pasted on the polymer. The surface debris ejected from the polymer is then combined with the ink layer on the polymer. Finally, both the surface debris and the ink layer can be removed using adhesive tape.

Inactivation of Bacillus subtilis Spores on Aluminum and Polyethylene Preformed Cartons by UV-Excimer Laser Irradiation

2000 ◽  
Vol 63 (6) ◽  
pp. 753-757 ◽  
Author(s):  
K. WARRINER ◽  
G. RYSSTAD ◽  
A. MURDEN ◽  
P. RUMSBY ◽  
D. THOMAS ◽  
...  
Keyword(s):  
Bacillus Subtilis ◽  
Laser Beam ◽  
Excimer Laser ◽  
Laser Light ◽  
Excimer Lasers ◽  
Uv Laser ◽  
Irradiation Treatment ◽  
Excimer Laser Irradiation ◽  
Krf Excimer Laser ◽  
Optimized Conditions

The efficacy of UV KrF-excimer laser light (at 248 nm) to inactivate Bacillus subtilis spores loaded onto preformed cartons was found to be dependent on the interior carton coating and scheme by which the irradiation was applied. When the carton was held static during UV laser treatment, the majority of the dose was delivered to the base of the carton and to a lesser extent to the upper part of the pack. In this arrangement no irradiation of the interior sides of the carton was observed. A more even distribution of dose was achieved, however, by moving the carton within the laser beam during irradiation treatment. The distribution of UV was also found to be dependent on the type of carton interior coating. With aluminum cartons the dose measured was found to be significantly greater (P &lt; 0.01) and more evenly distributed across the interior compared to when polyethylene packs were tested. Under optimized conditions no spore survivors were detected on aluminum cartons preloaded with 9.5 × 105 B. subtilis spores by applying a UV laser output dose of 160 J. In comparison, the same conditions only achieved a significantly lower (P &lt; 0.01) reduction in spore numbers (log count reduction 4.2) when polyethylene cartons were used. This difference in lethality and UV distribution of laser light was associated with the higher internal reflection of photons with aluminum cartons. The suitability of UV-excimer lasers for sterilizing preformed cartons over traditional germicidal lamp-based methods is discussed.

High Resolution Displacement of Functional Groups onto Fluorocarbon Resin Surface by Using ArF Excimer Laser

1996 ◽  
Vol 451 ◽  
Author(s):  
T. Shimizu ◽  
M. Murahara
Keyword(s):  
Contact Angle ◽  
High Resolution ◽  
Laser Beam ◽  
Thin Layer ◽  
Functional Groups ◽  
Excimer Laser ◽  
Laser Fluence ◽  
Large Area ◽  
Three Solutions ◽  
Arf Excimer Laser

ABSTRACTA Fluorocarbon resin surface was selectively modified by irradiation with a ArF laser beam through a thin layer of NaAlO2, B(OH)3, or H2O solution to give a hydrophilic property. As a result, with low fluence, the surface was most effectively modified with the NaAlO2 solution among the three solutions. However, the contact angle in this case changed by 10 degrees as the fluence changed only 1mJ/cm2. When modifying a large area of the surface, high resolution displacement could not be achieved because the laser beam was not uniform in displacing functional groups. Thus, the laser fluence was successfully made uniform by homogenizing the laser beam; the functional groups were replaced on the fluorocarbon resin surface with high resolution, which was successfully modified to be hydrophilic by distributing the laser fluence uniformly.

Phase Variation of Amorphous-Si and Poly-Si Thin Films with Excimer Laser Irradiation

1996 ◽  
Vol 35 (Part 2, No. 11B) ◽  
pp. L1473-L1475 ◽  
Author(s):  
Kuninori Kitahara ◽  
Katsuyuki Suga ◽  
Akito Hara ◽  
Kazuo Nakajima
Keyword(s):  
Thin Films ◽  
Laser Irradiation ◽  
Excimer Laser ◽  
Phase Variation ◽  
Excimer Laser Irradiation ◽  
Amorphous Si

scholarly journals Preparation and Properties of Superconducting thin Films by Excimer Laser Ablation

1990 ◽  
Vol 191 ◽  
Author(s):  
Michael E. Geusic ◽  
Alan F. Stewart ◽  
Larry R. Pederson ◽  
William J. Weber ◽  
Kenneth R. Marken ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Excimer Laser ◽  
Laser Energy ◽  
Substrate Surface ◽  
Xrd Analysis ◽  
Zero Field ◽  
Superconducting Transition ◽  
X Ray Diffraction ◽  
Excimer Laser Ablation

ABSTRACTExcimer laser ablation with an in situ heat treatment was used to prepare high quality superconducting YBa2Cu3O7−x thin films on (100)-SrTiO3 and (100)-LaAlO3 substrates. A pulsed excimer laser (XeCl; 308 nm) was used to ablate a rotating, bulk YBa2Cu3O7−x target at a laser energy density of 2–3 J/cm2. Based on four-probe dc resistance measurements, the films exhibited superconducting transition temperatures (Tc, midpoint) of 88 and 87K with 2K (90–10%) transition widths for SrTiO3 and LaAlO3, respectively. Transport critical current densities (Jc) measured at 77K were 2 × 106 and 1 × 106 A/cm2 in zero field for SrTiO3 and LaAlO3, respectively. X-ray diffraction (XRD) analysis showed the films to be highly oriented, with the c-axis perpendicular to the substrate surface.

Sign in / Sign up

Export Citation Format

Share Document