共查询到20条相似文献,搜索用时 46 毫秒
1.
E. Millon J. Perrière R.M. Défourneau D. Défourneau O. Albert J. Etchepare 《Applied Physics A: Materials Science & Processing》2003,77(1):73-80
The elemental composition and the surface morphology of thin films grown by laser ablation of barium titanate with femtosecond
pulses at 620 nm laser wavelength have been systematically studied according to the experimental pulsed-laser deposition parameters
: laser energy density, oxygen pressure, substrate temperature, target–substrate distance and substrate position (in- and
off-axis geometry). Firstly, even at high temperature (700 °C), the deposits consist of coalesced particles up to 1-μm in
size, mixed in a poorly crystallised tetragonal BaTiO3 thin film. The particles formed in femtosecond pulsed-laser deposition induce a high surface roughness, which is observed
whatever the experimental growth conditions and does not correspond to the droplets often observed during laser ablation in
the nanosecond regime. As shown by plasma expansion dynamics, these particles propagate toward the substrate in the plasma
plume with a low velocity, and are assumed to be produced by gas-phase reactions. Moreover, the cationic concentration evaluated
through the Ba/Ti ratio strongly depends on the oxygen pressure in the ablation chamber and the angular position of the substrate
along the normal to the target at laser impact. Indeed, the films appear to be enriched in the heavy element (Ba) when the
substrate is located at high angular deviation. This fact is correlated to an increase in the lighter species (i.e. Ti) in
the central part of the plasma plume.
Received: 30 April 2002 / Accepted: 26 August 2002 / Published online: 8 January 2003
RID="*"
ID="*"Corresponding author. Fax: +33-1/4354-2878, E-mail: millon@gps.jussieu.fr
RID="**"
ID="**"Also at: LSMCL, Université de Metz, 57078 Metz Cedex 3, France 相似文献
2.
Ch. Schwedes E. Peik J. von Zanthier A.Y. Nevsky H. Walther 《Applied physics. B, Lasers and optics》2003,76(2):143-147
A compact, tunable and narrow-bandwidth laser source for blue and ultraviolet radiation is presented. A grating-stabilized
diode laser at 922 nm is frequency-stabilized to below 100 Hz relative to a reference resonator. Injection of the diode-laser
light into a tapered amplifier yields a power of 0.5 W. In a first frequency-doubling stage, more than 200 mW of blue light
at 461 nm is generated by use of a periodically poled KTP crystal. Subsequent second-harmonic generation employing a BBO crystal
leads to about 1 mW of ultraviolet light at 231 nm.
Received: 12 August 2002 / Published online: 15 January 2003
RID="*"
ID="*"Corresponding author. Fax: +49-89/32905-200, E-mail: christian.schwedes@mpq.mpg.de
RID="**"
ID="**"Present address: PTB, Bundesallee 100, 38116 Braunschweig, Germany 相似文献
3.
A. Borowiec M. MacKenzie G.C. Weatherly H.K. Haugen 《Applied Physics A: Materials Science & Processing》2003,76(2):201-207
The final state of the material resulting from laser irradiation of silicon using 130 fs pulses at 790 nm was studied using
a number of techniques including scanning and transmission electron microscopies, as well as atomic force microscopy. Structural
details and the level of damage to the nearby solid following irradiation were characterized and are discussed in the context
of recent dynamical studies.
Received: 28 September 2001 / Accepted: 3 March 2002 / Published online: 19 July 2002
RID="*"
ID="*"Department of Engineering Physics, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
RID="**"
ID="**"Corresponding author. Fax: +1-905/521-2773, E-mail: borowia@mcmaster.ca
RID="***"
ID="***"Present address: Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK
RID="****"
ID="****"Department of Materials Science and the CEMD, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
RID="*****"
ID="*****"Departments of Engineering Physics, and Physics and Astronomy, and the CEMD, McMaster University, Hamilton, Ontario,
L8S 4M1, Canada 相似文献
4.
A. Di Lieto P. Minguzzi A. Pirastu S. Sanguinetti V. Magni 《Applied physics. B, Lasers and optics》2002,75(4-5):463-466
A Nd:YVO4 laser, end-pumped by a fiber-coupled diode-laser array, generates 7.3 W of output power at 1342 nm, the highest so far reported
for this host crystal. The slope efficiency is 40% and the output-beam divergence is close to the diffraction limit. An important
point in attaining such results is the choice of crystals with low Nd concentration.
Received: 16 July 2002 / Published online: 25 October 2002
RID="*"
ID="*"Corresponding author. Fax: +39-050/844333, E-mail: dilieto@df.unipi.it
RID="**"
ID="**"Permanent address: Scuola Normale Superiore, Piazza dei Cavalieri 7, Pisa, Italy 相似文献
5.
D. Ashkenasi G. Müller A. Rosenfeld R. Stoian I.V. Hertel N.M. Bulgakova E.E.B. Campbell 《Applied Physics A: Materials Science & Processing》2003,77(2):223-228
Experimental investigations using femtosecond and picosecond laser pulses at 800 nm illuminate the distinctions between the
dynamics and nature of ultrafast processing of dielectrics compared with semiconductors and metals. Dielectric materials are
strongly charged at the surface on the sub-ps time scale and undergo an impulsive Coulomb explosion prior to thermal ablation.
Provided the laser pulse width remains in the ps or sub-ps time domain, this effect can be exploited for processing. In the
case of thermal ablation alone, the high localization of energy accompanied by ultrafast laser micro-structuring is of great
advantage also for high quality processing of thin metallic or semiconducting layers, in which the surface charge is effectively
quenched.
Received: 17 January 2003 / Accepted: 8 February 2003 / Published online: 28 May 2003
RID="*"
ID="*"Corresponding author. Fax: +49-30/670-53-500, E-mail: d.ashkenasi@lmtb.dt
RID="**"
ID="**"Present address: LMTB GmbH, Berlin, Fabeckstr. 60–62, D-14195 Berlin, Germany 相似文献
6.
A.J.S. McGonigle A.J. Andrews G.P. Hogan D.W. Coutts C.E. Webb 《Applied physics. B, Lasers and optics》2003,76(3):307-311
A 10-kHz pulse-repetition-frequency dye-laser master-oscillator power amplifier, end-pumped by a copper vapour laser (CVL),
is reported. This laser was based on recently available, lightweight and compact CVL and dye laser components. Dye laser tunability
was achieved from 592 to 622 nm and, when the oscillator was etalon line-narrowed, up to 1.5 W of single-etalon-mode output
was obtained from the amplifier at the 608-nm peak tuning wavelength. By frequency doubling this amplified output in a BBO
crystal we obtained up to 225 mW of 5-GHz 308-nm output, which is suitable for the performance of tropospheric hydroxyl radical
concentration measurements.
Received: 16 July 2002 / Revised version: 6 November 2002 / Published online: 5 February 2003
RID="*"
ID="*"Present address: Department of Geography, University of Cambridge, Cambridge, CB2 3EN, UK
RID="**"
ID="**"Corresponding author. Fax: +44-1865/272400, E-mail: d.coutts1@physics.ox.ac.uk 相似文献
7.
A high-sensitivity in situ optical diagnostic technique for laser cleaning of transparent substrates
N. Chaoui J. Solis C.N. Afonso T. Fourrier T. Muehlberger G. Schrems M. Mosbacher D. Bäuerle M. Bertsch P. Leiderer 《Applied Physics A: Materials Science & Processing》2003,76(5):767-771
A differential optical transmission technique has been used to monitor in situ the efficiency of laser cleaning for the removal
of sub-micrometer-sized particles on substrates transparent at the monitoring wavelength. This technique has been applied
to the removal of sub-micrometer polystyrene particles on polyimide substrates using laser pulses of 30 ps duration at 292 nm
while probing the material transmission at 633 nm. The sensitivity achieved -1/104 for the transmission changes induced upon single-pulse laser exposure – allows us to monitor the removal of just a few sub-micron-sized
particles from the probed region inside the irradiated area.
Received: 2 October 2002 / Accepted: 7 October 2002 / Published online: 29 January 2003
RID="*"
ID="*"Corresponding author. Fax: +33-3/87844082, E-mail: nchaoui@iut.univ-metz.fr
RID="**"
ID="**"Present address: Laboratoire de Chimie et Applications, Institut Universitaire de Technologie de Metz, Département
Chimie, Rue Victor Demange, 57500 Saint-Avold, France 相似文献
8.
G. Stobrawa M. Hacker R. Netz M. Bischoff R. Sauerbrey 《Applied physics. B, Lasers and optics》2003,76(3):333-336
We present a novel method for measuring the linear and nonlinear dispersion properties of conventional and micro-structured
fibers. It is based on the automated compensation of phase modulations using a high-resolution pulse-shaping device. No tunable
laser source is required.
Received: 20 December 2002 / Published online: 19 March 2003
RID="*"
ID="*"Corresponding author. Fax: +49-3641/947202, E-mail: stobrawa@ioq.uni-jena.de
RID="**"
ID="**"Present address: Carl Zeiss Meditec AG, G?schwitzer Strasse 51–52, 07745 Jena, Germany 相似文献
9.
10.
T.J. Kulp S.E. Bisson R.P. Bambha T.A. Reichardt U.-B. Goers K.W. Aniolek D.A.V. Kliner B.A. Richman K.M. Armstrong R. Sommers R. Schmitt P.E. Powers O. Levi T. Pinguet M. Fejer J.P. Koplow L. Goldberg T.G. McRae 《Applied physics. B, Lasers and optics》2002,75(2-3):317-327
Quasi-phase-matched (QPM) materials allow the generation of spectroscopically useful infrared radiation in an efficient and
broadly tunable format. Here, we describe several applications of QPM-based light sources to remote and local chemical sensing.
The remote systems are gas imagers that employ a fiber-pumped continuous-wave optical parametric oscillator or a microlaser-pumped,
diode-seeded optical parametric amplifier as the illumination source. Technology described for local sensing includes a cavity
ring down spectrometer that employs a novel optical parametric generator–amplifier to achieve ≥350 cm-1 of contiguous tuning and a long-wave infrared light source based on QPM GaAs. In each case the use of QPM materials in conjunction
with effective pump sources instills simplicity and ruggedness into the sensing systems.
Received: 15 April 2002 / Revised version: 6 June 2002 / Published online: 12 September 2002
RID="*"
ID="*"Corresponding author. Fax: +1-925/294-2595, E-mail: tjkulp@sandia.gov
RID="**"
ID="**"Present address: Corning Inc., Corning, NY 14831, USA
RID="*"
ID="*"Present address: Corning Inc., Corning, NY 14831, USA
RID="**"
ID="**"Present address: Blue Leaf Networks, Sunnyvale, CA 94086, USA
RID="***"
ID="***"Present address: Sandia National Laboratories, Albuquerque, NM 87185, USA 相似文献
11.
V. Shutthanandan J. Zhang P. Ray 《Applied Physics A: Materials Science & Processing》2003,76(7):1093-1097
Silver, copper, and boron (from a boron nitride target) were sputtered with xenon ions. The isotopic composition of secondary
ions of silver was measured at ion energies ranging from 300 eV to 3 keV and, for copper and boron, at 2.0, 2.5, and 3.0 keV.
An ion gun was used to generate the ion beam. The secondary ions were detected at a small emission angle by a quadrupole mass
spectrometer. The secondary-ion flux of silver was found to be enriched in heavy isotopes at lower incident-ion energies.
The heavy-isotope enrichment was observed to decrease with increasing primary-ion energy. Beyond 500 eV, light isotopes of
silver were sputtered preferentially with the enrichment increasing to a constant value of 1.018. The sputtered flux of copper
and boron also indicated constant enrichments (1.008 and 1.281 for copper and boron respectively) in light isotopes at high
ion energies.
Received: 2 August 2002 / Accepted 9 August 2002: / Published online: 4 December 2002
RID="*"
ID="*"Present address: Pacific Northwest National Laboratory, Richland, WA 99 352, USA
RID="**"
ID="**"Present address: Philips Display Components Company, Ottawa, OH 45 875 USA
RID="***"
ID="***"Corresponding author. Fax: +1-334/727-8090, E-mail: pkray@tusk.edu 相似文献
12.
C. Keyser G. Schriever M. Richardson E. Turcu 《Applied Physics A: Materials Science & Processing》2003,77(2):217-221
The water droplet laser plasma source has been shown to have many attractive features as a continuous, almost debris-free
source for extreme ultraviolet (EUV) and X-ray applications. Through a dual experimental and theoretical study, we analyze
the interaction physics between the laser light and the target. The hydrodynamic laser plasma simulation code, Medusa103 is
used to model the electron density distribution for comparison to electron density distributions obtained through Abel inversion
of plasma interferograms. In addition, flat field EUV spectra are compared to synthetic spectra calculated with the atomic
physics code RATION.
Received: 31 October 2002 / Accepted: 8 February 2003 / Published online: 28 May 2003
RID="*"
ID="*"Present address: Naval Reseach Laboratory, Washington D.C.
RID="**"
ID="**"Present address: Xtreme Technologies, G?ttingen, Germany.
RID="***"
ID="***"Corresponding author. Fax: +1-407/823-3570, E-mail: mrichard@mail.ucf.edu 相似文献
13.
E. Gehrig O. Hess C. Seibert D. Woll R. Wallenstein 《Applied physics. B, Lasers and optics》2003,76(3):285-288
We theoretically describe and experimentally investigate the spatio-spectral wave mixing of induced and spontaneous emission
in large-area InGaAs-semiconductor laser amplifiers. The dynamic light-matter-coupling is described by a spatially resolved
theory based on Maxwell–Bloch–Langevin equations, taking into account many-body-carrier interactions, energy transfer between
the carrier and phonon systems and, in particular, the spatio-temporal interplay of stimulated and amplified spontaneous emission
and the noise caused by spontaneous emission. Our numerical model reveals the fundamental physical processes which are responsible
for the spectral power distribution of the amplified laser light and predicts the emission properties of high-power semiconductor
laser amplifiers, such as emission spectra and input power–output power characteristics.
Received:30October2002/Revisedversion:21November2002 / Published online: 12 February 2003
RID="*"
ID="*"Corresponding author. Fax: +49-711/6862-349, E-mail: Edeltraud.Gehrig@dlr.de
RID="**"
ID="**"Also at: Institute of Physics, Tampere University of Technology, P.O. Box 692, FIN-33101, Tampere, Finland
RID="***"
ID="***"Present address: Heidelberger Druckmaschinen AG, Speyerer Strasse 6, 69115 Heidelberg, Germany
RID="****"
ID="****"Present address: Lightbit Corporation, 411 Clyde Avenue, Mountain View, CA 94043, USA 相似文献
14.
Bulk heating of transparent materials using a high-repetition-rate femtosecond laser 总被引:7,自引:0,他引:7
C.B. Schaffer J.F. García E. Mazur 《Applied Physics A: Materials Science & Processing》2003,76(3):351-354
Femtosecond laser pulses can locally induce structural and chemical changes in the bulk of transparent materials, opening
the door to the three-dimensional fabrication of optical devices. We review the laser and focusing parameters that have been
applied to induce these changes and discuss the different physical mechanisms that play a role in forming them. We then describe
a new technique for inducing refractive-index changes in bulk material using a high-repetition-rate femtosecond oscillator.
The changes are caused by a localized melting of the material, which results from an accumulation of thermal energy due to
nonlinear absorption of the high-repetition-rate train of laser pulses.
Received: 21 November 2001 / Accepted: 9 July 2002 / Published online: 25 October 2002
RID="*"
ID="*"Corresponding author. Fax: +1-858/534-7697, E-mail: cschaffer@ucsd.edu
RID="**"
ID="**"Current address: University of California, San Diego, Department of Physics, La Jolla, CA 92 093, USA 相似文献
15.
We have developed a novel interferometric autocorrelator composed of only reflective elements, which functions as a beam splitter
and an optical delay line. Analytical expressions are derived to give second-order autocorrelation functions and deconvolution
factors for various conditions. The measurement of femtosecond laser pulses by interferometric autocorrelation is demonstrated
in the visible region. The results are compared with those by calculation.
Received: 9 December 2002
Revised version: 18 February 2003 / Published online: 5 May 2003
RID="*"
ID="*"Present address: Department of Physics, Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa 259-1207, Japan
RID="**"
ID="**"Corresponding author. Fax: +81-48/462-4682, E-mail: asuda@postman.riken.go.jp 相似文献
16.
R.A. Ganeev R.I. Tugushev A.A. Ishchenko N.A. Derevyanko A.I. Ryasnyansky T. Usmanov 《Applied physics. B, Lasers and optics》2003,76(6):683-686
We investigated nonlinear refraction, nonlinear absorption, and saturable absorption of polymethine dyes by the Z-scan technique
(λ=1064 nm). The analysis of simultaneous appearance of several nonlinear optical processes in dye solutions excited by picosecond
pulses was carried out. The saturable absorption was analyzed taking into account various models. Nonlinear refractive indices,
nonlinear absorption coefficients, and saturation intensities of various polymethine dyes were measured.
Received: 27 December 2002 / Revised version: 6 March 2003 / Published online: 5 May 2003
RID="*"
ID="*"Corresponding author. Fax: +81-471/363-366, E-mail: r_ganeev@issp.u-tokyo.ac.jp
RID="**"
ID="**"Present address: The Institute for Solid State Physics, The Tokyo University, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581,
Japan 相似文献
17.
R. Stoian M. Boyle A. Thoss A. Rosenfeld G. Korn I.V. Hertel 《Applied Physics A: Materials Science & Processing》2003,77(2):265-269
Phase-manipulated ultrafast laser pulses and temporally tailored pulse trains with THz repetition rates are promising new
tools for quality micromachining of brittle dielectrics, allowing to adapt the laser energy delivery rate to the material
properties for optimal processing. Different materials respond with specific reaction pathways to the sudden energy input
depending on the efficiency of electron generation and on the ability to release the energy into the lattice. The sequential
energy delivery with judiciously chosen pulse trains may induce softening of the material during the initial steps of excitation
and change the energy coupling for the subsequent steps. We show that this can result in lower stress, cleaner structures,
and allow for a material-dependent optimization process.
Received: 7 October 2002 / Accepted: 20 January 2003 / Published online: 28 May 2003
RID="*"
ID="*"Corresponding author. Fax: +49-30/6392-1229, E-mail: stoian@mbi-berlin.de
RID="**"
ID="**"Now at Katana Technologies GmbH, Albert-Einstein-Ring 7, 14532 Kleinmachnow, Germany 相似文献
18.
J. Ihlemann S. Müller S. Puschmann D. Schäfer M. Wei J. Li P.R. Herman 《Applied Physics A: Materials Science & Processing》2003,76(5):751-753
Submicron surface-relief gratings were fabricated on fused silica by F2-laser ablation with nanosecond duration pulses from a high-resolution 157-nm optical processing system. A 157 nm wavelength
projection mask was prepared by ArF-laser ablation to form a 20-μm period grating of equal lines and spaces. A 25-fold demagnification
of the mask by a Schwarzschild objective generated gratings of an 830-nm period and a 250 nm modulation depth, as characterized
by SEM, AFM and HeNe-laser beam diffraction.
Received: 24 April 2002 / Accepted: 25 April 2002 / Published online: 4 December 2002
RID="*"
ID="*"Corresponding author. Fax: +49-551/503 599, E-mail: jihle@llg.gwdg.de 相似文献
19.
K.P. Unnikrishnan J. Thomas V.P.N. Nampoori C.P.G. Vallabhan 《Applied physics. B, Lasers and optics》2002,75(8):871-874
The wavelength dependence of the nonlinear absorption of a bis-phthalocyanine, Nd(Pc)2, dissolved in dimethyl formamide was studied in the rising part of the Q-band using the open aperture Z-scan technique, to
determine the wavelength region over which the nonlinear absorption changes from reverse saturable absorption to saturable
absorption. It was found that the sample could be used as a reverse saturable absorber, and hence as an optical limiter, up
to a wavelength of about 604 nm. The imaginary part of the third order susceptibility was also calculated for these wavelengths.
Resonant enhancement of the imaginary part of the third order susceptibility was clearly observed.
Received: 26 April 2002 / Revised version: 30 June 2002 / Published online: 20 December 2002
RID="*"
ID="*"Corresponding author. Fax: +91-484/576-714, E-mail: kpu@cusat.ac.in
RID="**"
ID="**"Present address: Optical Sciences Center, University of Arizona, Tucson, USA 相似文献
20.
A versatile CO laser-based photoacoustic spectrometer is presented equipped with three photoacoustic cells placed inside the
laser cavity. The newly designed CO laser can operate both in the Δv=1 and the Δv=2 modes (5.1–8.0 μm and 2.8–4.1 μm) on 400
laser lines. Improved laser operation originating from a better cooling of the gas discharge was evidenced by a shift of the
laser output power to lower J-values. Due to the wide emission range of the source, many molecules of biological and atmospheric
interest, including methane and ethane, can be detected with sensitivities typically at the (sub)ppb level. Measurement of
the respiration of a cockroach showed that the spectrometer is not only sensitive, but also has a good time response (8 s
at a flow rate of 10 l/h).
Received: 3 April 2002 / Revised version: 14 June 2002 / Published online: 21 August 2002
RID="*"
ID="*"Current address: Soegijapranata Catholic University, Department of Food Technology, Jalan Pawiyatan Luhur IV/1 Bendan
Duwur, P.O. Box 8033/SM, Semarang 50234, Indonesia
RID="**"
ID="**"Current address: Sanata Dharma University, FMIPA, Kampus III, Paingan, Maguwoharjo, Depok, Sleman, Tromol Pos 29, Yogyakarta
55002, Indonesia
RID="***"
ID="***"Corresponding author. Fax: +31-24/365-3311, E-mail: fransh@ sci.kun.nl 相似文献