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Author(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
Ke 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)]
Yacine 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)]
Regina 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)]
Publication year: 2013
Source:Optics & Laser Technology, Volume 49
Jakub 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)]
A 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.
Author(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
Publication 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...
Naoto 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.
Author(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
Publication 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...
Alex 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)]
S. 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.
T. 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.
We 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]"?>