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Author(s): Stéphane Coen and Thibaut Sylvestre
A recent Brief Report [Zhang , Phys. Rev. A 80, 045803 (2009)] presents experimental results in which dark pulses are generated in a fiber laser. Contrary to what is presented, the data published in that Brief Report do not support the claim that the duration of the dark dips are in the 8 ps range a...
[Phys. Rev. A 82, 047801] Published Tue Oct 26, 2010
Reza Salem, Mark A. Foster, Alexander L. Gaeta
Manipulation and characterization of information using ultrafast optical signals is critical for numerous applications in telecommunications, biology, quantum information science, spectroscopy, and atomic and molecular physics. Femtosecond pulsed laser sources are available over a wide range of ... [Adv. Opt. Photon. 5, 274-317 (2013)]
C. Cuadrado-Laborde, M. Bello-Jiménez, A. Díez, J. L. Cruz, M. V. Andrés
We demonstrate low-frequency active mode locking of an erbium-doped all-fiber ring laser. As the mode locker, we used a new in-fiber bandpass acousto-optic modulator showing 74% modulation depth, 3.7 dB power insertion losses, 4.5 nm of optical bandwidth, and 20 dB of nonresonant ... [Opt. Lett. 39, 68-71 (2014)]
Utsav D. Dave, Sarah Uvin, Bart Kuyken, Shankar Selvaraja, Francois Leo, Gunther Roelkens
A 1000 nm wide supercontinuum, spanning from 1470 nm in the telecom band to 2470 nm in the mid-infrared is demonstrated in a 800 nm x 220 nm 1 cm long hydrogenated amorphous silicon strip waveguide. The pump source was a picosecond Thulium doped fiber laser centered at 1950 nm. The real part of the ... [Opt. Express 21, 32032-32039 (2013)]
Chao Chang, Jinyang Liang, Dongwei Hei, Michael F. Becker, Kelei Tang, Yiping Feng, Vitaly Yakimenko, Claudio Pellegrini, Juhao Wu
A normal-incident flattop laser with a tapered end is proposed as an optical undulator to achieve a high-gain and high-brightness X-ray free electron laser (FEL). The synchronic interaction of an electron bunch with the normal incident laser is realized by tilting the laser pulse front. The ... [Opt. Express 21, 32013-32018 (2013)]
Ó. Martínez-Matos, P. Vaveliuk, J. G. Izquierdo, V. Loriot
Spatial shaping of ultrashort laser beams at the focal plane is theoretically analyzed. The description of the pulse is performed by its expansion in terms of Laguerre-Gaussian orthonormal modes. This procedure gives both a comprehensive interpretation of the propagation dynamics and the required ... [Opt. Express 21, 25010-25025 (2013)]
Haowen Ruan, Melissa L. Mather, Stephen P. Morgan
A method that uses digital heterodyne holography reconstruction to extract scattered light modulated by a single-cycle ultrasound (US) burst is demonstrated and analyzed. An US burst is used to shift the pulsed laser frequency by a series of discrete harmonic frequencies which are then locked on a ... [J. Opt. Soc. Am. A 30, 1409-1416 (2013)]
Author(s): A. Waheed, D. Fregenal, Ø. Frette, M. Førre, B. T. Hjertaker, E. Horsdal, I. Pilskog, and J. Preclikova
Multiphoton intrashell transitions in strongly driven Li (n=25) Rydberg atoms are studied experimentally. Orthogonal dc electric and magnetic fields lift the degeneracy of the n shell and define the eccentricity e of the initial coherent elliptic states, which are formed by laser excitation and subs...
[Phys. Rev. A 83, 063421] Published Tue Jun 28, 2011
Cristina Elena Preda, Gautier Ravet, Patrice Mégret
Self-Q-switched operation of the all-fiber laser using erbium and samarium fibers in the cavity is realized experimentally. This passively Q-switched all-fiber laser produces very stable pulses with energy of 142?nJ and duration of 450?ns. The experimental results were well reproduced by the ... [Opt. Lett. 37, 629-631 (2012)]
Md. Sohel Mahmud Sher, Paolo Pintus, Fabrizio Di Pasquale
For the first time [to our best knowledge] a high-index-contrast z-cut Er:LiNbO_3 photonic wire waveguide laser, optically pumped at 980 nm wavelength, is designed for continuous-wave operation. Waveguide modes and laser characteristics are numerically computed using a developed full vectorial ... [Appl. Opt. 52, 4438-4445 (2013)]
Sha Tao, Ronald L. Jacobsen, and Benxin Wu
Investigations have been performed on the physical mechanisms of picosecond laser ablation of silicon carbide at 355 and 1064 nm, which have not been well understood yet. The study shows that the low-fluence ablation rates are close for 355 and 1064 nm, and the dominant material removal mechanism sh ... [Appl. Phys. Lett. 97, 181918 (2010)] published Thu Nov 4, 2010.
Yusuke Nagai, Ryushi Fujimura, Kotaro Kajikawa
A core-resonance cylindrical whispering gallery mode (WGM) laser is reported in dye-doped nematic liquid crystals (NLCs) filled in a glass capillary. This laser runs on the basis of the properties that NLC has an extraordinary refractive index much higher than that of a glass and that it plays as a ... [J. Opt. Soc. Am. B 30, 2233-2239 (2013)]
Author(s): N. Boechler, J. K. Eliason, A. Kumar, A. A. Maznev, K. A. Nelson, and N. Fang
We study the interaction of surface acoustic waves (SAWs) with a contact-based vibrational resonance of 1 μm silica microspheres forming a two-dimensional granular crystal adhered to a substrate. The laser-induced transient grating technique is used to excite SAWs and measure their dispersion. The ...
[Phys. Rev. Lett. 111, 036103] Published Wed Jul 17, 2013
The aim of the study was evaluate tooth movement, receptor activator of nuclear factor KB ligand (RANKL), osteoprotegerin (OPG), and RANKL/OPG ratio in gingival crevicular fluid (GCF) in compression side and pain level during initial orthodontic tooth treatment to determine the efficacy of low-level laser therapy (LLLT). Ten volunteers who required fixed appliance positioned from the upper first premolars to upper first molars were selected. For each patient, the upper first premolar of the quadrant 1 was chosen to be irradiated with a laser diode at 670 nm, 200 mW, and 6.37 W/cm2, applied on the distal, buccal, and lingual sides during 9 min on days 0, 1, 2, 3, 4, and 7. The same procedure was applied in the first premolar of the contralateral quadrant inserting the tip but without laser emission. Samples of GCF from the compression side of the upper first premolars to distalize were collected at baseline and after 2, 7, 30, and 45 days posttreatment for determination of RANKL and OPG by enzyme-linked immunosorbent assay.
A free space optical wireless communication system with 3 degree angular coverage and 1.25 GHz modulation bandwidth is reported, in which relatively narrow laser beam of a simultaneous high power, high modulation speed and ultra high modulation efficiency directly modulated two-electrode tapered laser diode is steered using a nematic phase-only Liquid-Crystal On Silicon Spatial Light Modulator (LCOS SLM) by displaying reconfigurable 256 phase level gratings.
L. M. Zhao, A. C. Bartnik, Q. Q. Tai, F. W. Wise
Theoretical and experimental investigations of the behavior of normal-dispersion fiber lasers with nonlinear optical loop mirrors are presented. The use of a loop mirror causes the laser to generate relatively long, flat-topped pulses. The pulse energy can be high, but the pulse duration is limited ... [Opt. Lett. 38, 1942-1944 (2013)]
Zhenkun Yu, Hongbo He, Wei Sun, Hongji Qi, Minghong Yang, Qiling Xiao, Meiping Zhu
The laser-induced damage threshold (LIDT) of a single-layer coating at the nanosecond (ns) regime is obviously lower than an uncoated substrate or a high reflectivity coating coated by the same material. To elucidate this phenomenon, we demonstrate the LIDT of three types of samples at 355 nm ... [Opt. Lett. 38, 4308-4311 (2013)]
Nature Photonics 6, 795 (2012).
Fifty years ago, researchers at a handful of laboratories around the world were reporting lasing from the first semiconductor lasers. Our IT infrastructure today relies on their diligence and success.
Alex Dinovitser, Murray W. Hamilton, Robert A. Vincent
Wavelength accuracy and stability are key requirements for differential absorption lidar (DIAL). We present a control and timing design for the dual-stabilized cw master lasers in a pulsed master-oscillator power-amplifier configuration, which forms a robust low-cost water-vapor DIAL transmitter ... [Appl. Opt. 49, 3274-3281 (2010)]