Virtual Journal of Laser is a web tool to help laser researchers follow new publications from major academic journals, discover and promote interesting works by voting, commenting and simply visiting. Subscribe Virtual Journal of Laser to take the advantage! Read more...
If you find VJLaser helpful, please consider donation for covering the host costage. Many thanks!
Vaibhav Gaind, Hsiao-Rho Tsai, Kevin J. Webb, Venkatesh Chelvam, Philip S. Low
Despite the broad impact in medicine that optics can bring, thus far practical approaches are limited to weak scatter or near-surface monitoring. We show a method that utilizes a laser topography scan and a diffusion equation model to describe the photon transport, together with a multiresolution ... [J. Opt. Soc. Am. A 30, 1146-1154 (2013)]
V. Ménoret, R. Geiger, G. Stern, N. Zahzam, B. Battelier, A. Bresson, A. Landragin, P. Bouyer
We present a compact and stable dual-wavelength laser source for onboard atom interferometry with two different atomic species. It is based on frequency-doubled telecom lasers locked on a femtosecond optical frequency comb. We take advantage of the maturity of fiber telecom technology to reduce the ... [Opt. Lett. 36, 4128-4130 (2011)]
Antonio Agnesi, Alessandro Greborio, Federico Pirzio, Elena Ugolotti, Giancarlo Reali, Annalisa Guandalini, Juerg Aus der Au
In this paper, we present a simple, compact, and efficient Yb:CALGO laser system that can produce sub-100 fs pulses easily tunable over a 38 nm wide wavelength range between 1034 and 1072 nm. The laser is passively mode locked with a semiconductor saturable absorber and generates up ... [J. Opt. Soc. Am. B 30, 1513-1516 (2013)]
L. Greusard, D. Costantini, A. Bousseksou, J. Decobert, F. Lelarge, G.-H. Duan, Y. De Wilde, R. Colombelli
We image in near-field the transverse modes of semiconductor distributed feedback (DFB) lasers operating at λ ≈1.3 μm and employing metallic gratings. The active region is based on tensile-strained InGaAlAs quantum wells emitting transverse magnetic polarized light and is ... [Opt. Express 21, 10422-10429 (2013)]
Jennifer L. Gottfried
Laser-induced breakdown spectroscopy is a promising approach for explosive residue detection, but several limitations to its widespread use remain. One issue is that the emission spectra of the residues are dependent on the substrate composition because some of the substrate is usually entrained in ... [Appl. Opt. 52, B10-B19 (2013)]
Publication year: 2010
Source: Optics Communications, In Press, Uncorrected Proof, Available online 21 May 2010
Xiaofeng, Jin , Jianfeng, Sun , Yi, Yan , Yu, Zhou , Liren, Liu
In range-resolved reflective tomography laser radar imaging system, for accurate image reconstruction, all projections must be aligned to the center of target rotation. Due to the unknown location of the axis of rotation and random target translation, the center of target rotation in each projection cannot be measured accurately and images reconstructed based on range-resolved projections without registration would be dislocated. Here, we apply a feature tracking method to align projections data for tomographic reconstruction in laboratory-scale laser radar imaging. The target was placed on a spin table with an unknown and fixed axis, and the oscillatory motion of the...
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.
Jianmin Li, Ye Tian, Chongxiang Li
A theoretical model of far-field interference from a sphere has been established, and its applications have been investigated. When two coherent parallel laser beams shine on a smooth sphere surface from opposite directions, the reflected lights form interference fringes at far field. The fringes ... [Appl. Opt. 51, 2501-2504 (2012)]
A full multicore fiber optic link is demonstrated, transmitting greater than 100 Gb/s through a single strand of multimode fiber for the first time. The fiber, which consists of seven graded-index multimode cores, is used to transmit up to 120 Gb/s over 100 m using a custom multicore-fiber interfacing transmitter and receiver. 2-D arrays of vertical-cavity surface-emitting lasers (VCSELs) and vertically illuminated photodiodes (PDs) are fabricated with a geometry corresponding to the outer six cores of the seven-core fiber, which is arranged in a hexagonal pattern. Both flip-chip and wire-bonding technologies are used to package the VCSEL and PD chips with multichannel transmitter and receiver integrated circuits. Amplitude and timing margins of the end-to-end signals are analyzed through bit-error-rate (BER) measurements. The effects of electrical and optical crosstalk are shown to result in negligible degradation to the BER performance.
Author(s): Hong Liu, Yunquan Liu, Libin Fu, Guoguo Xin, Difa Ye, Jie Liu, X. T. He, Yudong Yang, Xianrong Liu, Yongkai Deng, Chengyin Wu, and Qihuang Gong
We measure photoelectron angular distributions of single ionization of krypton and xenon atoms by laser pulses at 1320 nm, 0.2–1.0×1014 W/cm2, and observe that the yield of near-zero-momentum electrons in the strong-field tunneling ionization regime is significantly suppressed. Semiclassical simula...
[Phys. Rev. Lett. 109, 093001] Published Mon Aug 27, 2012
Igor Alexeenko, Jean-François Vandenrijt, Giancarlo Pedrini, Cédric Thizy, Birgit Vollheim, Wolfgang Osten, Marc P. Georges
We describe three different interferometric techniques (electronic speckle pattern interferometry, digital holographic interferometry, and digital shearography), using a long-wave infrared radiation produced by a CO_2 laser and recorded on a microbolometer array. Experimental results showing how ... [Appl. Opt. 52, A56-A67 (2013)]
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)]
Publication year: 2012
Source: Optics & Laser Technology, Volume 44, Issue 1, February 2012, Pages 210-217
Xin, Sun , Bing-liang, Hu , Li-bo, Li , Zhong-hou, Wang
An engineering prototype of Hadamard transform spectral imager for object detection is presented. The programmable mask, using Digital Micro-mirror Device, is set on the second image plane to implement the function of spectral domain encoding. This method can significantly increase the detecting possibility with improved SNR of the relatively weak spectrum signature. A refractive configuration designed for visible spectrum application is proposed, and the optical design strategies of each functional unit are described in detail in order to meet both the image quality and the structural feasibility. The method of mask positioning is studied and the promising spectral recovery results...
Highlights: ► Engineering prototype of visible spectrum-encoding HTSI is constructed. ► Optical design strategies of the refractive configuration are discussed in detail. ► Mask positioning method is presented and its validity is verified by experimental results.
Wilfried Glastre, Olivier Jacquin, Olivier Hugon, Hugues Guillet de Chatellus, Eric Lacot
In this paper we study the origin and the effect of amplitude and phase noise on laser optical feedback imaging associated with a synthetic aperture (SA) imaging system. Amplitude noise corresponds to photon noise and acts as an additive noise; it can be reduced by increasing the global measurement ... [J. Opt. Soc. Am. A 29, 2247-2255 (2012)]
Zachary M. Geballe and Raymond Jeanloz
Many high-pressure high-temperature studies using laser-heated diamond cells have documented plateaus in the increase of temperature with increasing laser power or with time. By modeling heat transfer in typical laser-heated diamond anvil cell experiments, we demonstrate that latent heat due to melt ... [J. Appl. Phys. 111, 123518 (2012)] published Mon Jun 25, 2012.
Gang Chen, Rainer Martini, Seong-wook Park, Clyde G. Bethea, I.-Chun A. Chen et al.
An optically induced fast wavelength shift is demonstrated in a standard middle infrared (MIR) quantum cascade laser (QCL) by illuminating the front facet with a femtosecond (fs) near infrared (NIR) laser, allowing fast optical frequency modulation (FM) for free space optical communication (FSOC) an ... [Appl. Phys. Lett. 97, 011102 (2010)] published Wed Jul 7, 2010.
Author(s): M. Holler, F. Schapper, L. Gallmann, and U. Keller
We perform attosecond time-resolved transient absorption spectroscopy around the first ionization threshold of helium and observe rapid oscillations of the absorption of the individual harmonics as a function of time delay with respect to a superimposed, moderately strong infrared laser field. The p...
[Phys. Rev. Lett. 106, 123601] Published Mon Mar 21, 2011
Tsai-wei Wu, Wei-zung Chang, Almantas Galvanauskas, Herbert G. Winful
We generalize the recently proposed model for coherent beam combining in passive fiber laser arrays [Opt. Express 17, 19509 (2009)] to include the transient gain dynamics and the complication of counterpropagating waves, two important features characterizing actual experimental conditions. The ... [Opt. Express 18, 25873-25886 (2010)]
J. Javaloyes, S. Balle
Multimode dynamics in bidirectional laser cavities can be accurately described by folding space into time delay. This results in a set of delayed algebraic equations that preserve the dynamics of all cavity modes while drastically reducing number of degrees of freedom. This reduction allows for ... [Opt. Express 20, 8496-8502 (2012)]
Publication year: 2013
Source:Optics & Laser Technology, Volume 49