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Shaista Shahzada, Palvasha Ijaz, Mehmood Shah, Sami-Ul- Haq, Mushtaq Ahmed, Ali Nadeem
In the present work, the experimentally determined oscillator strengths of the 3p P2→nd D^2 (16≤n≤43) Rydberg transitions of lithium have been reported for the first time. The experiments were performed using two dye lasers simultaneously pumped by the second ... [J. Opt. Soc. Am. B 29, 3386-3392 (2012)]
I. Galli, F. Cappelli, P. Cancio, G. Giusfredi, D. Mazzotti, S. Bartalini, P. De Natale
We report on the generation of a frequency comb around 4330 nm with an unprecedented coherence of the single teeth. Generating the comb within a Ti:sapphire laser cavity by a difference-frequency process and using a phase-lock scheme based on direct digital synthesis, we achieve a tooth linewidth ... [Opt. Express 21, 28877-28885 (2013)]
Bin Ma, Yanyun Zhang, Hongping Ma, Hongfei Jiao, Xinbin Cheng, Zhanshan Wang
The influence of the incidence angle and polarization state on the damage site characteristics of fused silica under 355 nm laser irradiation was investigated. The initial damage morphologies and growth behaviors of the damage sites on the exit surface at incidence angles of 0° and ... [Appl. Opt. 53, A96-A102 (2014)]
Jörg Körner, Joachim Hein, Hartmut Liebetrau, Reinhard Seifert, Diethard Klöpfel, Martin Kahle, Markus Loeser, Mathias Siebold, Ulrich Schramm, Malte C. Kaluza
We present a novel approach for the amplification of high peak power femtosecond laser pulses at a high repetition rate. This approach is based on an all-diode pumped burst mode laser scheme. In this scheme, pulse bursts with a total duration between 1 and 2 ms are be generated and amplified. They ... [Opt. Express 21, 29006-29012 (2013)]
Seth D. Cohen, Andrés Aragoneses, Damien Rontani, M. C. Torrent, Cristina Masoller, Daniel J. Gauthier
We demonstrate experimentally how to harness quasi-periodic dynamics in a semiconductor laser with dual optical feedback for measuring subwavelength changes in each arm of the cavity simultaneously. We exploit the multifrequency spectrum of quasi-periodic dynamics and show that independent ... [Opt. Lett. 38, 4331-4334 (2013)]
Badr Elmaanaoui, Bingqing Wang, Jordan C. Dwelle, Austin B. McElroy, Shuang S. Liu, Henry G. Rylander, Thomas E. Milner
A Swept Source Polarization-Sensitive Optical Coherence Tomography (SS-PS-OCT) instrument has been designed, constructed, and verified to provide high sensitivity depth-resolved birefringence and phase retardation measurements of the retinal nerve fiber layer. The swept-source laser had a center ... [Opt. Express 19, 10252-10268 (2011)]
S. Keyvaninia, S. Verstuyft, L. Van Landschoot, F. Lelarge, G.-H. Duan, S. Messaoudene, J. M. Fedeli, T. De Vries, B. Smalbrugge, E. J. Geluk, J. Bolk, M. Smit, G. Morthier, D. Van Thourhout, G. Roelkens
Heterogeneously integrated III-V-on-silicon second-order distributed feedback lasers utilizing an ultra-thin DVS-BCB die-to-wafer bonding process are reported. A novel DFB laser design exploiting high confinement in the active waveguide is demonstrated. A 14 mW single-facet output power ... [Opt. Lett. 38, 5434-5437 (2013)]
Source:Optics & Laser Technology, Volume 57
Author(s): Chao Meng , Hong Zhou , Ying Zhou , Ming Gao , Xin Tong , Dalong Cong , Chuanwei Wang , Fang Chang , Luquan Ren
Guojie Tu, Yu Wang, Fengzhong Dong, Hua Xia, Tao Pang, Zhirong Zhang, Bian Wu
A novel method for online correction of light intensity fluctuation in a
practical tunable diode laser absorption spectroscopy (TDLAS) system with wavelength
modulation is presented. The proposed method is developed according to the linear
relation ... [Chin. Opt. Lett. 10, 042801- (2012)]
Author(s): Stefan Schütz, Hessam Habibian, and Giovanna Morigi
The semiclassical dynamics of atoms, when the atoms are confined inside a standing-wave high-finesse resonator, is theoretically studied. The atoms are cooled by scattering processes in which the photons of a transverse laser are coherently scattered into the cavity mode. We derive a Fokker-Planck e...
[Phys. Rev. A 88, 033427] Published Mon Sep 30, 2013
Source:Optics & Laser Technology, Volume 56
Author(s): Jing Han , Jiang Yue , Yi Zhang , Lian-fa Bai
The incidence of methicillin-resistant strains of Staphylococcus aureus (MRSA) is increasing globally, making urgent the discovery of novel alternative therapies for infections. Photodynamic antimicrobial chemotherapy (PACT), based on oxidative damage to subcellular structures, has the advantage of circumventing multidrug resistance, and is becoming a potential therapeutic modality for methicillin-resistant bacteria. The key to PACT is photosensitization. This study demonstrates the efficiency of PACT using α-d-galactopyranosyl zinc phthalocyanines (T1–T4) for the photosensitization of MRSA, Escherichia coli, and Pseudomonas aeruginosa. Bacterial suspensions were illuminated with 650-nm light from a semiconductor laser at 0.2 W/cm2, and the energy density was maintained at 6 J/cm2 in the presence of different concentrations of photosensitizer.
Author(s): Fabian Berski, Hendrik Kuhn, Jan G. Lonnemann, Jens Hübner, and Michael Oestreich
We advance all optical spin noise spectroscopy (SNS) in semiconductors to detection bandwidths of several hundred gigahertz by employing a sophisticated scheme of pulse trains from ultrafast laser oscillators as an optical probe. The ultrafast SNS technique avoids the need for optical pumping and en...
[Phys. Rev. Lett. 111, 186602] Published Tue Oct 29, 2013
Lucas N. Taylor, Andrew K. Brown, Aaron J. Pung, Eric G. Johnson, Joseph J. Talghader
The laser-damage thresholds of single material and nanolaminate thin films were compared under continuous-wave (CW) illumination conditions. Nanolaminate films consist of uniform material interrupted by the periodic insertion of one or more atomic layers of an alternative material. Hafnia and ... [Opt. Lett. 38, 4292-4295 (2013)]
Andreas Molitor, Pierluigi Debernardi, Sébastien Hartmann, Wolfgang Elsäßer
We present experimental investigations on spatially resolved Stokes parameters of vertical-cavity surface-emitting lasers (VCSELs) with a small aperture diameter of 3 μm and a monolithically integrated surface grating on top of the structure to technologically control the polarization. ... [Opt. Lett. 38, 4777-4780 (2013)]
Spatially and spectrally resolved near-field images of the transverse mode patterns of vertical cavity surface emitting lasers (VCSELs) are obtained by confocal microscopy with optical spectrum analyzer. A non-circular internal effective index profile of the VCSEL is inferred from the observed wavelength splitting of the degenerated modes. Using the mode intensity patterns associated with their spectral information, an elliptical parabolic profile superposed to a step-like refractive index profile is extracted by fitting the internal structural parameters of VCSEL. Wavelength splitting of the degenerated
An innovative investigation was theoretically and experimentally carried out on a back-reflected pumping power (BRP) in the Yb:YAG thin-disk laser. Based on the Monte Carlo ray tracing method and laser rate equations, the pumping and absorption processes of a thin-disk laser are simulated in the lasing condition. The effects of pumping diameter, disk specifications, and cooling temperature on the BRP and laser efficiency are investigated. Also, an experimental method is suggested and applied to the measurement of BRP. The results show good consistency between simulations and experimental measurements. In addition, the theoretical calculations reveal that BRP is strongly dependent on the thin-disk specifications and pumping parameters.
Author(s): Emmanuel Paspalakis, Sofia Evangelou, Vassilios Yannopapas, and Andreas F. Terzis
We study the linear absorption and dispersion properties of a four-level double-V-type quantum system near a plasmonic nanostructure. The quantum system interacts with two orthogonal circularly polarized laser fields with the same frequency and different phases and electric field amplitudes. We find...
[Phys. Rev. A 88, 053832] Published Thu Nov 21, 2013
Bruno Frackowiak, Cameron Tropea
Laser-induced fluorescence (LIF) has been previously used in various forms to characterize droplets in a spray, according to either size or temperature. A rigorous examination is presented of the LIF signal obtained when a water droplet seeded by Rhodamine 6G passes through one or two highly ... [Opt. Lett. 35, 1386-1388 (2010)]