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Production of Picosecond, Kilojoule, and Petawatt Laser Pulses via Raman Amplification of Nanosecond Pulses
Wed, 2011-08-31 02:00 — GuestAuthor(s): R. M. G. M. Trines, F. Fiúza, R. Bingham, R. A. Fonseca, L. O. Silva, R. A. Cairns, and P. A. Norreys
Raman amplification in plasma has been promoted as a means of compressing picosecond optical laser pulses to femtosecond duration to explore the intensity frontier. Here we show for the first time that it can be used, with equal success, to compress laser pulses from nanosecond to picosecond duratio...
[Phys. Rev. Lett. 107, 105002] Published Wed Aug 31, 2011
Fiber-delivered picosecond source for coherent Raman scattering imaging
Tue, 2011-11-01 02:00 — GuestKe Wang, Chris Xu
We demonstrate a two-color, fiber-delivered picosecond source for coherent Raman scattering (CRS) imaging. The wavelength-tunable picosecond pump is generated by nonlinear spectral compression of a prechirped femtosecond pulse from a mode-locked titanium:sapphire (Ti:S) laser. The 1064?nm ... [Opt. Lett. 36, 4233-4235 (2011)]
III-V photonic crystal wire cavity laser on silicon wafer
Fri, 2010-10-01 02:00 — GuestYacine Halioua, Alexandre Bazin, Paul Monnier, Timothy J. Karle, Isabelle Sagnes, Gunther Roelkens, Dries Van Thourhout, Fabrice Raineri, Rama Raj
We report on the modeling and experimental characterization of an InP-based photonic crystal wire cavity laser bonded to a silicon wafer. Simulations give an insight into the variation of the resonant mode frequency and the dependence of the Q-factor on the geometrical parameters of the laser ... [J. Opt. Soc. Am. B 27, 2146-2150 (2010)]
Multiple solitons grouping in fiber lasers by dispersion management and nonlinearity control
Mon, 2013-04-01 02:00 — GuestRegina Gumenyuk, Oleg G. Okhotnikov
Dispersion-managed bound solitons and soliton bunches have been studied experimentally in a fiber laser mode-locked by saturable absorber with biexponential recovery dynamics, which enforces strongly the soliton interaction. The excessive nonlinearity and dispersion in a cavity was found to provoke ... [J. Opt. Soc. Am. B 30, 776-781 (2013)]
Spray pyrolysed Cu2ZnSnS4 absorbing layer: A potential candidate for photovoltaic applications
Sun, 2013-02-10 01:03 — GuestJuly 2013
Publication year: 2013
Source:Optics & Laser Technology, Volume 49
Hyperspectral imaging for thermal analysis and remote gas sensing in the short wave infrared
Sat, 2012-04-28 07:51 — Guest
interferometer has been demonstrated in the short wave infrared (SWIR) region. The technique allows the realization of a lightweight
and compact instrument yet allowing much faster and/or better quality hyperspectral images with respect to classical instruments
based on a dispersive means or on a tunable band-pass filter. The potentialities in spectroscopic applications like remote
gas sensing are presented as well as accurate thermal imaging capabilities.
Pulse propagation in atomic media in the triangular configuration
Sat, 2013-06-01 02:00 — GuestJakub Korociński, Andrzej Raczyński, Jarosław Zaremba, Sylwia Zielińska-Kaniasty
Weak probe-pulse propagation is studied in a three-level atomic system irradiated by a strong control laser field and a strong microwave field in the closed-loop triangular (Δ) configuration. In addition to the direct absorption channel, a second channel is activated in which a probe ... [J. Opt. Soc. Am. B 30, 1517-1523 (2013)]
Fiber Dispersion Measurement With a Swept-Wavelength Pulse Light Source
Thu, 2010-04-01 21:00 — GuestA new fiber dispersion measurement method by utilizing a periodically swept-wavelength pulse light source is proposed and demonstrated. The periodic pulse timing variation of the pulse train induced by wavelength sweeping can be directly detected by a radio-frequency spectrum analyzer. Experiments by using an asynchronous mode-locked fiber soliton laser as the swept-wavelength pulse source have been successfully carried out to demonstrate the feasibility.
Changes in the state of polarization of partially coherent flat-topped beam in turbulent atmosphere for different source conditions
Wed, 2010-12-22 22:13 — Guest
(PCFT) beams passing through atmospheric turbulence are studied in detail. The effects are studied of different source conditions
on the polarization states of a PCFT beam propagating through atmospheric turbulence. Based on the unified theory of the polarization
states for random electromagnetic beams, we have established the detailed formula for calculating the change of the polarization
states of such beams.
beam “N” under different source conditions were investigated.
Laser-Enabled Auger Decay in Rare-Gas Atoms
Mon, 2011-01-31 07:00 — GuestAuthor(s): P. Ranitovic, X. M. Tong, C. W. Hogle, X. Zhou, Y. Liu, N. Toshima, M. M. Murnane, and H. C. Kapteyn
In rare-gas atoms, Auger decay in which an inner-valence shell ns hole is filled is not energetically allowed. However, in the presence of a strong laser field, a new laser-enabled Auger decay channel can open up to increase the double-ionization yield. This process is efficient at high laser intens...
[Phys. Rev. Lett. 106, 053002] Published Mon Jan 31, 2011
Polarization properties of partially coherent electromagnetic elegant Laguerre–Gaussian beams in turbulent atmosphere
Wed, 2011-02-16 08:59 — Guest
for the polarization degree and spectral coherence degree of partially coherent electromagnetic elegant Laguerre–Gaussian
(PCEELG) beams through turbulent atmosphere are obtained theoretically in detail. It is found that the polarization degree
of PCEELG beams tends to the value of its source plane after a sufficiently long propagation distance in turbulent atmosphere.
Furthermore, this value is independent of the beam orders, the correlation length in the source plane and the structure constant
of the turbulent atmosphere (
). The polarization degree of PCEELG beams also acquires a particular value at a certain distance in free space, which isdifferent from the value in the source plane.
Quantitative model for the change of optical resonance in neural activity detection systems based on surface plasmon resonance
Sun, 2011-01-16 08:33 — GuestPublication year: 2011
Source: Optics & Laser Technology, In Press, Corrected Proof, Available online 15 January 2011
Seung Ho, Choi , Sung June, Kim , Chang-Hwan, Im , Shin Ae, Kim , Daejoong, Kim
The mechanism of neural activity detection using the surface plasmon resonance (SPR) phenomenon was theoretically explored in this paper. Investigating the mechanism of SPR neural recordings has been difficult due to the complex relationship between different physiological and physical processes such as excitation of a nerve fiber and coherent charge fluctuations on the metal surface. This paper examines how these different processes may be connected by introducing a set of compartmental theoretical models that deal with the molecular scale phenomena; Poisson–Boltzmann (PB) equation, which was used to describe the ion concentration change under the time varying electrostatic potential, Drude–Lorentz electron...
Spatially resolved argon microplasma diagnostics by diode laser absorption
Tue, 2011-01-11 01:01 — GuestNaoto Miura and Jeffrey Hopwood
Microplasmas were diagnosed by spatially resolved diode laser absorption using the Ar 801.4 nm transition (1s-2p). A 900 MHz microstrip split ring resonator was used to excite the microplasma which was operated between 100760 Torr (13101 kPa). The gas temperatures and the Ar 1s line-integrated dens ... [J. Appl. Phys. 109, 013304 (2011)] published Mon Jan 10, 2011.
Sooting turbulent jet flame: characterization and quantitative soot measurements
Sat, 2011-02-05 08:48 — Guest
tools. Preferred features for numerical simulations of a sooting, turbulent test case flame are simplicity (no pilot flame),
well-defined boundary conditions, and sufficient soot production. This paper proposes a non-premixed C2H4/air turbulent jet flame to fill this role and presents an extensive database for soot model validation.
10,000. The flame has a measured lift-off height of 26 mm which acts as a sensitive marker for CFD model validation, while
this novel compiled experimental database of soot properties, temperature and velocity maps are useful for the validation
of kinetic soot models and numerical flame simulations.
Stabilization of Helium in Intense xuv Laser Fields
Fri, 2010-04-23 02:00 — GuestAuthor(s): T. Birkeland, R. Nepstad, and M. Førre
We investigate the impact of electron-electron correlation on the ionization dynamics of helium in intense, high-frequency laser fields by solving the time-dependent Schrödinger equation from first principles. Although we observe a decrease in the total ionization yield at high field strengths, the...
[Phys. Rev. Lett. 104, 163002] Published Fri Apr 23, 2010
Frequency signature of water activity by biospeckle laser
Sat, 2011-01-15 08:06 — GuestPublication year: 2011
Source: Optics Communications, In Press, Uncorrected Proof, Available online 14 January 2011
Rafael Rodrigues, Cardoso , Anderson Gomide, Costa , Cassia Marques Batista, Nobre , Roberto Alves, Braga Jr.
Biospeckle laser technique has become an important tool to investigate biological activity in several areas of science. However, due to the complexity of biological materials it is necessary to develop research processes that ensure greater efficiency in isolating areas of different activities in the same material using the biospeckle. Thus, alternative techniques, such as those related to spectral domain, allow approaches that provide a means for frequency and isolation marking of various observed phenomena. The possibility of creating frequency markers related to physical or chemical phenomena under biospeckle laser monitoring opens the way for important applications in the analysis of...
Polarization-switchable Q-switched DFB fiber laser
Wed, 2010-03-31 07:00 — GuestAlex Fraser, Martin Bernier, Jean-Daniel Deschênes, Éric Weynant, Jérome Genest, Réal Vallée
A polarization switchable Q-switched distributed feedback (DFB) fiber laser is presented. This what we believe to be a new Q-switching method allows one to obtain linearly polarized laser emission in either x or y direction. The principle of this method is based on a variable birefringent phase ... [Opt. Lett. 35, 1046-1048 (2010)]
Direct observation of dynamic surface acoustic wave controlled carrier injection into single quantum posts using phase-resolved optical spectroscopy
Thu, 2011-01-13 23:01 — GuestS. Volk, F. Knall, F. J. R. Schulein, T. A. Truong, H. Kim et al.
A versatile stroboscopic technique based on active phase-locking of a surface acoustic wave to picosecond laser pulses is used to monitor dynamic acoustoelectric effects. Time-integrated multichannel detection is applied to probe the modulation of the emission of a quantum well for different frequen ... [Appl. Phys. Lett. 98, 023109 (2011)] published Thu Jan 13, 2011.
Gain of blue and cyan InGaN laser diodes
Thu, 2011-01-13 23:01 — GuestT. Lermer, A. Gomez-Iglesias, M. Sabathil, J. Muller, S. Lutgen et al.
Experimental gain spectra of 450 and 490 nm laser diodes on c-plane GaN are analyzed by detailed comparison with the results of a fully microscopic theory. The gain calculation shows the importance of electron LO-phonon coupling. The whole spectral gain shape, not only the low energy tail, is strong ... [Appl. Phys. Lett. 98, 021115 (2011)] published Thu Jan 13, 2011.
Efficient 460-nm Second-Harmonic Generation With Optically Pumped Semiconductor Disk Lasers
Thu, 2011-01-13 20:00 — GuestWe present a semiconductor disk laser with a fundamental emission at 920 nm which is frequency-doubled utilizing a bismuth triborate nonlinear crystal. The generated blue emission at 460 nm is the most suitable wavelength for display applications. The device layer design and the applied resonator geometry are discussed. Experimental results reveal overall optical-to-optical conversion efficiencies of up to 41.5% for the fundamental and up to 14.5% for the second-harmonic emission.<?Pub _bookmark Command="[Quick Mark]"?>
