Single pulse vibrational Raman scattering by a broadband KrF excimer laser in a hydrogen–air flame

1990 ◽  
Vol 29 (15) ◽  
pp. 2325 ◽  
Author(s):  
Robert W. Pitz ◽  
Joseph A. Wehrmeyer ◽  
J. M. Bowling ◽  
Tsarng-Sheng Cheng
Keyword(s):  
Raman Scattering ◽  
Excimer Laser ◽  
Single Pulse ◽  
Krf Excimer Laser

CRACKING AND EXFOLIATION OF TiO2 FILM IRRADIATED WITH EXCIMER LASER

2008 ◽  
Vol 15 (04) ◽  
pp. 473-479 ◽  
Author(s):  
H. X. QIAN ◽  
W. ZHOU ◽  
H. Y. ZHENG
Keyword(s):  
Excimer Laser ◽  
Laser Fluence ◽  
Single Pulse ◽  
Single Shot ◽  
Uv Laser ◽  
Original Surface ◽  
Excimer Laser Pulse ◽  
Surface Protrusion ◽  
Krf Excimer Laser ◽  
Effect Of Surface

TiO 2 film deposited on glass was irradiated in air with single-shot KrF excimer laser pulse. The surface roughened as the result of the laser ablation. It is further noted that single-pulse irradiation with fluence ranging from 400 to 1200 mJ/cm2 gave rise to protrusion of the irradiated surface above the original surface, which is in contrast to usual expectation that irradiated surface is below the unirradiated surface. The surface protrusion is mainly attributed to the effect of surface tension. At the laser fluence of 1000 mJ/cm2, cracks were formed in the irradiated area and severe film exfoliation was observed at the periphery of the irradiated area due to the release of internal stress. With higher laser fluence above 1000 mJ/cm2, patches of film were observed to peel off within the irradiated areas. Hydrodynamic ablation is proposed to account for film exfoliation. The observed phenomenon is useful for further understanding how TiO 2 film reacts to strong UV laser irradiation.

Millimeter-long nanofibers of PMMA spun at super-high speed by ablation with a single pulse of a KrF excimer laser

2002 ◽  
Vol 75 (6) ◽  
pp. 677-680 ◽  
Author(s):  
F. Weisbuch ◽  
V.N. Tokarev ◽  
S. Lazare ◽  
C. Belin ◽  
J.L. Bruneel
Keyword(s):  
Excimer Laser ◽  
High Speed ◽  
Single Pulse ◽  
Krf Excimer Laser

scholarly journals Bragg Gratings Induced in Birefringent Optical Fiber with an Elliptical Stress Cladding

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
I. K. Meshkovskiy ◽  
V. E. Strigalev ◽  
A. V. Kulikov ◽  
S. V. Varzhel'
Keyword(s):  
Optical Fiber ◽  
Excimer Laser ◽  
High Performance ◽  
Fiber Bragg Gratings ◽  
Single Pulse ◽  
Bragg Gratings ◽  
Type I ◽  
Type Ii ◽  
Krf Excimer Laser ◽  
Birefringent Optical Fiber

The paper presents the results of writing of type I and high-performance type II fiber Bragg gratings in birefringent optical fiber with an elliptical stress cladding by a single 20 ns pulse of KrF excimer laser (248 nm). The gratings’ efficiency produced by a single pulse was up to 100%. Experimental results on visualization of these gratings are presented.

A Systematic Study of the Formation of Nano-Tips on Silicon Thin Films by Excimer Laser Irradiation

2005 ◽  
Vol 872 ◽  
Author(s):  
D.G. Georgiev ◽  
R.J. Baird ◽  
I. Avrutsky ◽  
G. Auner ◽  
G. Newaz ◽  
...  
Keyword(s):  
Excimer Laser ◽  
Silicon Film ◽  
Single Crystal Silicon ◽  
Single Pulse ◽  
Crystal Silicon ◽  
Force Microscopy ◽  
Silicon Thin Films ◽  
Direct Laser ◽  
Direct Laser Fabrication ◽  
Krf Excimer Laser

AbstractRecently, we reported conditions for controllable, direct laser fabrication of sharp conical tips with heights of about one micrometer and apical radii of curvature of several tens of nanometers. An individual cone is formed when a single-crystal silicon film on an insulator substrate is irradiated in air environment with a single pulse from a KrF excimer laser, homogenized and shaped to a circular spot several microns in diameter. In this work, we present a study of the formation of such tips as a function of the laser fluence, the film thickness, and the diameter of the irradiated spot. Atomic force microscopy and scanning electron microscopy were used to study the topography of the structures. A simple mechanism of formation based on movement of melted material is proposed. We have also studied structures (nano-ridges) that resulted from irradiation with narrow lines (width of several microns) instead of circular spots.

scholarly journals The influence of KrF excimer laser irradiation on the surface of collagen and collagen/PVP films

2006 ◽  
Vol 2006 ◽  
pp. 1-7 ◽  
Author(s):  
M. Wisniewski ◽  
A. Sionkowska ◽  
H. Kaczmarek ◽  
J. Skopinska ◽  
S. Lazare ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Excimer Laser ◽  
Bubble Formation ◽  
Three Dimensional ◽  
Single Pulse ◽  
Local Heat ◽  
Vinyl Pyrrolidone ◽  
Excimer Laser Irradiation ◽  
Krf Excimer Laser ◽  
Poly Vinyl Pyrrolidone

The surface properties of collagen and collagen/poly(vinyl pyrrolidone) (PVP) films after KrF excimer laser irradiation (λ=248nm) were investigated by means of the technique of scanning electron microscopy (SEM) and optical microscopy (OM). The laser irradiation of the used specimens caused an expansion of materials above their surface with pronounced sings of its melting. The height of the ablated volume in a case of collagen film at a fluence of1.1J/cm2was approximately 5μm. A white damage appears on the treated surfaces at a threshold of0.5J/cm2with a single pulse and becomes more visible for a higher fluence. It is also noteworthy that along with increasing fluences (beginning from the fluence of1.7J/cm2), the characteristic filaments at the spot edges are observed. The local heat and pressure generated by the laser radiation were able to induce bubble formation on the surface. Further bubble colliding and bursting produce a three-dimensional polymer “microfoam” structure with interconnected pores. These results can be of interest for some new applications.

Single-pulse fabrication of improved fiber Bragg gratings using a phase-conjugated KrF excimer laser

1995 ◽  
Author(s):  
Martin A. Putnam ◽  
Charles G. Askins ◽  
Glen M. Williams ◽  
E. J. Friebele ◽  
Mark Bashkansky ◽  
...  
Keyword(s):  
Excimer Laser ◽  
Fiber Bragg Gratings ◽  
Single Pulse ◽  
Bragg Gratings ◽  
Krf Excimer Laser
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