Pulse-Train Amplification Of Subnanosecond Near-Transform-Limited KRF Laser Pulses

1988 ◽  
Author(s):  
T D. Raymond ◽  
C Reiser ◽  
R G. Adams ◽  
R B. Michie ◽  
C Woods
Keyword(s):  
Pulse Train ◽  
Laser Pulses ◽  
Krf Laser

Characterization of columns grown during KrF laser micromachining of Al2O3–TiC ceramics

2003 ◽  
Vol 18 (5) ◽  
pp. 1123-1130 ◽  
Author(s):  
V. Oliveira ◽  
R. Vilar
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Laser Pulses ◽  
Formation Mechanisms ◽  
X Ray ◽  
Reducing Conditions ◽  
Transmission Electron ◽  
Column Formation ◽  
Krf Laser

This paper aims to contribute to the understanding of column formation mechanisms in Al2O3–TiC ceramics micromachined using excimer lasers. Chemical and structural characterization of columns grown in Al2O3–TiC composite processed with 200 KrF laser pulses at 10 J/cm2 was carried out by scanning electron microscopy, transmission electron microscopy, x-ray photoelectron spectroscopy, and x-ray diffraction analysis. Fully developed columns consist of a core of unprocessed material surrounded by an outer layer of Al2TiO5, formed in oxidizing conditions, and an inner layer, formed in reducing conditions, composed of TiC and Al3Ti or an AlTi solid solution. Possible mechanisms of column formation are discussed.

Doping and crystallization of amorphous SiGe films with an excimer (KrF) laser

1995 ◽  
Vol 10 (8) ◽  
pp. 1884-1888 ◽  
Author(s):  
S. Krishnan ◽  
M.I. Chaudhry ◽  
S.V. Babu
Keyword(s):  
Silicon Germanium ◽  
Room Temperature ◽  
Laser Pulses ◽  
Laser Exposure ◽  
Silicon Substrates ◽  
A Value ◽  
Crystal Film ◽  
Krf Laser ◽  
Amorphous Silicon Germanium

Amorphous silicon germanium (a-SiGe) films, deposited on silicon substrates at room temperature in a molecular beam epitaxy system, were transformed into a single-crystal film and doped with phosphorus by exposure to KrF laser pulses. Electron channeling patterns showed that laser exposure resulted in crystallization of the undoped a-SiGe films. The SiGe films were doped by laser irradiation, using a phosphorus spin-on-dopant. The sheet resistance of the doped films decreased with increasing numbers of pulses, reaching a value of about ∼ 5 × 104 ohms/□ after 15 pulses. I-V data from mesa-type n-SiGe/p-Si diode devices were used to determine the effect of laser processing on the quality of the SiGe films.

scholarly journals Large Spectral Shift of Reflected Radiation From Laser Plasmas Generated by High Contrast KrF Laser Pulses

2020 ◽  
Vol 8 ◽  
Author(s):  
Zsolt Kovács ◽  
Barnabás Gilicze ◽  
Sándor Szatmári ◽  
István B. Földes
Keyword(s):  
Laser Pulses ◽  
Spectral Shift ◽  
High Contrast ◽  
Laser Plasmas ◽  
Krf Laser

Vaporization of aluminum by 50 ps KrF laser pulses

1996 ◽  
Vol 80 (1) ◽  
pp. 509-512 ◽  
Author(s):  
Y. Y. Tsui ◽  
R. Fedosejevs ◽  
C. E. Capjack
Keyword(s):  
Laser Pulses ◽  
Krf Laser

Dependence of keV x‐ray generation on the temporal and spatial separation of two KrF laser pulses

1994 ◽  
Vol 76 (9) ◽  
pp. 5047-5053 ◽  
Author(s):  
R. Bobkowski ◽  
J. N. Broughton ◽  
R. Fedosejevs ◽  
R. J. Willis ◽  
M. R. Cervenan
Keyword(s):  
Spatial Separation ◽  
Laser Pulses ◽  
X Ray ◽  
Krf Laser ◽  
Temporal And Spatial

Ablation and thermal effects in treatment of hard and soft materials and biotissues using ultrafast-laser pulse-train bursts

2012 ◽  
Vol 1 (3) ◽  
Author(s):  
Robin S. Marjoribanks ◽  
Christian Dille ◽  
Joshua E. Schoenly ◽  
Luke McKinney ◽  
Aghapi Mordovanakis ◽  
...  
Keyword(s):  
Pulse Train ◽  
Soft Tissues ◽  
Strong Field ◽  
Laser System ◽  
Soft Materials ◽  
Laser Pulses ◽  
Ultrafast Laser ◽  
Field Mode ◽  
Ultrafast Laser Pulses ◽  
Tissue Therapy

AbstractUltrafast laser pulses (≤1 ps) are qualitatively different in the nature of their interaction with materials, including biotissues, as compared to nanosecond or longer pulses. This can confer pronounced advantages in outcomes for tissue therapy or laser surgery. At the same time, there are distinct limitations of their strong-field mode of interaction. As an alternative, it is shown here that ultrafast laser pulses delivered in a pulse-train burst mode of radiant exposure can access new degrees of control of the interaction process and of the heat left behind in tissues. Using a laser system that delivers 1 ps pulses in 20 μs pulse-train bursts at 133 MHz repetition rates, a range of heat and energy-transfer effects on hard and soft tissue have been studied. The ablation of tooth dentin and enamel under various conditions, to assess the ablation rate and characterize chemical changes that occur, are reported. This is compared to ablation in agar gels, useful live-cell-culture phantom of soft tissues, and presenting different mechanical strength. Study of aspects of the optical science of laser-tissue interaction promises to make qualitative improvements to medical treatments using lasers as cutting and ablative tools.

Erratum: Analysis of multiphoton ionization of metal atoms in the saturation regime using subpicosecond KrF laser pulses [Phys. Rev. A58, 3836 (1998)]

1999 ◽  
Vol 59 (4) ◽  
pp. 3141-3141
Author(s):  
B. Witzel ◽  
C. J. G. J. Uiterwaal ◽  
H. Schröder ◽  
D. Charalambidis ◽  
K.-L. Kompa
Keyword(s):  
Multiphoton Ionization ◽  
Laser Pulses ◽  
Saturation Regime ◽  
Metal Atoms ◽  
Krf Laser

Ionization-induced blue shift of KrF laser pulses in an underdense plasma

1996 ◽  
Vol 54 (2) ◽  
pp. 2166-2169 ◽  
Author(s):  
Y. M. Li ◽  
R. Fedosejevs
Keyword(s):  
Blue Shift ◽  
Laser Pulses ◽  
Krf Laser ◽  
Underdense Plasma

Formation of plasma columns in atmospheric pressure gases by picosecond KrF laser pulses

1992 ◽  
Vol 93 (5-6) ◽  
pp. 366-377 ◽  
Author(s):  
Y.M. Li ◽  
J.N. Broughton ◽  
R. Fedosejevs ◽  
T. Tomie
Keyword(s):  
Atmospheric Pressure ◽  
Laser Pulses ◽  
Krf Laser
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