共查询到20条相似文献,搜索用时 187 毫秒
1.
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
2.
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
3.
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
4.
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
5.
From laser-induced line narrowing to electro- magnetically induced transparency: closed system analysis 总被引:1,自引:0,他引:1
The laser-induced line-narrowing effect, discovered more than thirty years ago, can also be applied to recent studies in high
resolution spectroscopy based on electromagnetically induced transparency. In this paper we first present a general form of
the transmission width of electromagnetically induced transparency in a homogeneously broadened medium. We then analyze a
Doppler broadened medium by using a lorentzian function as the atomic velocity distribution. The dependence of the transmission
linewidth on the driving field intensity is discussed and compared to the laser-induced line-narrowing effect. This dependence
can be characterized by a parameter which can be regarded as “the degree of optical pumping.”
Received: 17 December 2001 / Published online: 15 January 2003
RID="*"
ID="*"Corresponding author. E-mail: hwang.Lee@jpl.nasa.gov
RID="**"
ID="**"Present address: Jet Propulsion Laboratory, MS 126-347, California Institute of Technology, Pasadena, CA 91109, USA 相似文献
6.
J. Luque R.J.H. Klein-Douwel J.B. Jeffries G.P. Smith D.R. Crosley 《Applied physics. B, Lasers and optics》2003,76(6):715-715
/ Published online: 11 June 2003
RID="*"
ID="*"Present address: Lam Research Corporation, Fremont, CA 94538, USA
RID="**"
ID="**"Present address: Mechanical Engineering, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
RID="***"
ID="***"Present address: Mechanical Engineering Dept., Stanford University, Stanford CA 94305, USA
RID="****"
ID="****"Corresponding author. Fax: +1-650/859-6196, E-mail: smith@mplvax.sri.com 相似文献
7.
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
8.
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
9.
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
10.
A. Sasoh N. Urabe S.S.M. Kim I.-S. Jeung 《Applied Physics A: Materials Science & Processing》2003,77(2):349-352
The laser-driven in-tube accelerator (LITA) is a unique device for laser propulsion. It is characterized by the acceleration
of a projectile in a tube. The thrust performance can be improved by exploiting a confinement effect. In the experiment, a
3.0-g projectile is vertically launched, and the momentum coupling coefficient is measured for various monoatomic gases. The
measured coupling coefficient is almost proportional to the reciprocal of the speed of sound. The same impulse generation
characteristics are obtained in simplified situations that are analyzed based on conservation relations.
Received: 26 August 2002 / Accepted: 8 February 2003 / Published online: 28 May 2003
RID="*"
ID="*"Corresponding author. Fax: +81-22/217-5284, E-Mail: sasoh@ifs.tohoku.ac.jp
RID="**"
ID="**"Present address: also at Institute of Advanced Aerospace Technology, Seoul National University, Seoul, 151-742, Korea 相似文献
11.
J. Fassbender S. Poppe T. Mewes J. Juraszek B. Hillebrands K.-U. Barholz R. Mattheis D. Engel M. Jung H. Schmoranzer A. Ehresmann 《Applied Physics A: Materials Science & Processing》2003,77(1):51-56
It has been demonstrated that He+ ion irradiation is an excellent tool for modifying magnetic properties, like the magnetic anisotropy, the interlayer exchange
coupling strength and the exchange bias field of ultra-thin magnetic layered systems. This paper summarizes the effects of
ion irradiation on exchange bias systems. As a first example, for possible applications of the ion induced magnetic effects,
the realization of an angle sensing device is described.
Received: 11 November 2002 / Accepted: 12 November 2002 / Published online: 4 April 2003
RID="*"
ID="*"Corresponding author. Fax: +49-631-205-4095, E-mail: fassbend@physik.uni-kl.de
RID="**"
ID="**"Present address: Université de Rouen, Rouen, France 相似文献
12.
We examine in detail the theory of the intrinsic non-linearities in the dynamics of trapped ions due to the Coulomb interaction.
In particular, the possibility of mode–mode coupling, which can be a source of decoherence in trapped ion quantum computation,
or can be exploited for parametric down-conversion of phonons, is discussed and conditions under which such coupling is possible
are derived.
Received: 8 November 2002 / Published online: 26 March 2003
RID="*"
ID="*"Permanent address: MIP, Université Pierre et Marie Curie and Département de Physique, école Normale Supérieure, 75005
Paris, France
RID="**"
ID="**"Corresponding author. Fax: +1-505/667-1931, E-mail: dfvj@lanl.gov 相似文献
13.
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
14.
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
15.
We investigate the long-time behavior of the Glauber dynamics for the random energy model below the critical temperature.
We establish that for a suitably chosen timescale that diverges with the size of the system, one can prove that a natural
autocorrelation function exhibits aging. Moreover, we show that the long-time asymptotics of this function coincide with those
of the so-called ``REM-like trap model' proposed by Bouchaud and Dean. Our results rely on very precise estimates on the
distribution of transition times of the process between different states of extremely low energy.
Received: 9 October 2001 / Accepted: 17 October 2002
Published online: 21 March 2003
RID="*"
ID="*" Work Partially supported by the Swiss National Science Foundation under contract 21-65267.01
RID="**"
ID="**" On leave from CPT-CNRS, Luminy, Case 907, 13288 Marseille Cedex 9, France. E-mail: veronique.gayrard@epfl.ch
Communicated by M. Aizenman 相似文献
16.
A deconvolution filtering model of multiple scattering in ground-based single field of view (SFOV) LIDAR returns is described.
It is based on time series deconvolution techniques. The contribution of multiply scattered photons in SFOV LIDAR returns
can be numerically modeled by processing LIDAR signals without additional information about aerosol properties and measurement
geometry. Deconvolution results are in good agreement with those performed by Monte Carlo calculations, showing that the significance
of multiply scattered photons is strongly correlated with aerosol concentration. It is found that, for ground-based LIDAR,
the contribution of multiply scattered photons to LIDAR signals is typically below 5% in a clear urban atmosphere, and up
to 14% in a very dirty urban atmosphere in Hong Kong during winter seasons.
Received: 8 October 2002 / Revised version: 29 January 2003 / Published online: 22 May 2003
RID="*"
ID="*"Corresponding author. Fax: +81-298/51-8229, E-mail: gao@proteo.gr.jp
RID="**"
ID="**"Present address: Preteomics Lab., Amakubo 1-16-1, Tsukuba 305-0005, Japan 相似文献
17.
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
18.
R.A. Pérez F. Dyment G. García Bermúdez D. Abriola M. Behar 《Applied Physics A: Materials Science & Processing》2003,76(2):247-250
The diffusion of Ta in the hcp (α) phase of high-purity Ti (99.99%) was studied at different temperatures from 911 K up to
1123 K. The Rutherford Backscattering Spectrometry (RBS) and Heavy Ion RBS (HIRBS) techniques were used to obtain the penetration
profiles. The evolution of the diffusion coefficient, D, as a function of temperature follows prediction of the Arrhenius
law. The activation energy of the diffusion process is (318±7)kJ/mol, similar to that corresponding to self-diffusion in α-Ti.
On the other hand, the measured values of D are systematically lower than those corresponding to self-diffusion by a factor
of approximately 5. This reduction could be explained by taking into account the mass difference between Ta and Ti. An increase
of the diffusion coefficient was measured when the diffusion proceeds on a less pure Ti (99.9%) matrix. This increment is
higher at lower temperatures.
Received: 12 November 2001 / Accepted: 12 March 2002 / Published online: 5 July 2002
RID="*"
ID="*"
RID="*"
ID="*"
RID="**"
ID="**"Corresponding author. Fax: +54-11/6772-7362, E-mail: dyment@cnea.gov.ar
RID="*"
ID="*"Members of the Carrera del Investigador Científico del Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET),
Argentina 相似文献
19.
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
20.
Sub-nanosecond microchip laser with intracavity Raman conversion 总被引:3,自引:0,他引:3
A.A. Demidovich P.A. Apanasevich L.E. Batay A.S. Grabtchikov A.N. Kuzmin V.A. Lisinetskii V.A. Orlovich O.V. Kuzmin V.L. Hait W. Kiefer M.B. Danailov 《Applied physics. B, Lasers and optics》2003,76(5):509-514
Efficient sub-nanosecond pulse operation of microchip lasers with intracavity Raman conversion and pulse compression is presented
for the first time. The microchip lasers were composed of Nd:LSB or Nd:YAG laser crystals, Cr4+:YAG saturable absorber, and Ba(NO3)2 Raman medium. The pulse duration obtained at the Stokes wavelength (1196 nm) was as short as 118 ps. Optical conversion efficiency
of laser-diode pump power to the Stokes power of 8% was reached. Pulse energy and peak power of Stokes emission were 1.2 μJ
and 5.4 kW, correspondingly. Numerical calculations are in good agreement with obtained experimental results.
Received: 20 December 2002 / Revised version: 6 March 2003 / Published online: 5 May 2003
RID="*"
ID="*"Corresponding author. Fax: +1-716/645-6945, E-mail: ankuzmin@acsu.buffalo.edu
RID="**"
ID="**"Present address: University at Buffalo, SUNY, The Institute for Lasers, Photonics, and Biophotonics, 458 NSC, Buffalo,
NY 14 260-3000, USA 相似文献