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Ultra-low-noise microwave extraction from fiber-based optical frequency combEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In this Letter we report on an all-optical-fiber approach to the generation of ultra-low-noise microwave signals. We make use of two erbium fiber mode-locked lasers phase locked to a common ultrastable laser source to generate an 11.55 GHz signal with an unprecedented relative phase noise of ... (Source: Optics Letters)
Source: Optics Letters - November 21, 2009 Category: Physics Authors: J. MilloR. BoudotM. LoursP. Y. BourgeoisA. N. LuitenY. Le CoqY. KersaléG. Santarelli Source Type: journals

Multiple-cardiac-cycle noise reduction in dynamic optical coherence tomography of the embryonic heart and vasculatureEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Recent progress in optical coherence tomography (OCT) allows imaging dynamic structures and fluid flow within scattering tissue, such as the beating heart and blood flow in mouse embryos. Accurate representation and analysis of these dynamic behaviors require reducing the noise of the acquired ... (Source: Optics Letters)
Source: Optics Letters - November 21, 2009 Category: Physics Authors: Sandeep BhatIrina V. LarinaKirill V. LarinMary E. DickinsonMichael Liebling Source Type: journals

Observation of two-dimensional superlattice solitonsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We observe experimentally two-dimensional solitons in superlattices comprising alternating deep and shallow waveguides fabricated via the femtosecond-laser direct writing technique. We find that the symmetry of linear diffraction patterns as well as soliton shapes and threshold powers largely ... (Source: Optics Letters)
Source: Optics Letters - November 21, 2009 Category: Physics Authors: M. HeinrichY. V. KartashovL. P. R. RamirezA. SzameitF. DreisowR. KeilS. NolteA. TünnermannV. A. VysloukhL. Torner Source Type: journals

Fringe-free holographic measurements of large-amplitude vibrationsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In the measurement of the amplitude of vibration of objects, holographic imaging techniques usually involve fringe counting; because of the limited resolution of the images, measurements of large amplitudes are not accessible. We demonstrate a technique that suppresses the necessity of fringe ... (Source: Optics Letters)
Source: Optics Letters - November 21, 2009 Category: Physics Authors: F. JoudF. VerpillatF. LaloëM. AtlanJ. HareM. Gross Source Type: journals

Optoacoustic imaging using fiber-optic interferometric sensorsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
An interferometric sensor based on nonmetallic silica optical fiber is presented as an ultrasonic wideband transducer for optoacoustic imaging applications. We have characterized the sensitivity of the optical fiber sensor by detecting optoacoustic signals from an optically absorbing object ... (Source: Optics Letters)
Source: Optics Letters - November 21, 2009 Category: Physics Authors: Horacio LamelaDaniel GallegoAlexander Oraevsky Source Type: journals

Ultrabroadband optical chirp linearization for precision metrology applicationsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We demonstrate precise linearization of ultrabroadband laser frequency chirps via a fiber-based self-heterodyne technique to enable extremely high-resolution, frequency-modulated cw laser-radar (LADAR) and a wide range of other metrology applications. Our frequency chirps cover bandwidths up to ... (Source: Optics Letters)
Source: Optics Letters - November 21, 2009 Category: Physics Authors: Peter A. RoosRandy R. ReibelTrenton BergBrant KaylorZeb W. BarberWm. Randall Babbitt Source Type: journals

Acoustic index of Ge-doped optical fibersEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A precise relation between the acoustic index and the amount of doped Ge in silica is established using both energy and wave dispersive spectroscopies on preform pieces and stimulated Brillouin scattering in optical fibers. It is shown that the relation is in very good agreement with a simple model ... (Source: Optics Letters)
Source: Optics Letters - November 21, 2009 Category: Physics Authors: Søren HerstrømLars Grüner-NielsenBera Pálsdóttir Source Type: journals

Characterizing topological charge of optical vortices by using an annular apertureEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We explore the spatial frequency property of the far-field diffraction intensity pattern of an optical vortex after passing through an annular aperture in detail. The result reveals that the spatial spectrum consists of alternate bright and dark rings and, in particular, the number of the bright ... (Source: Optics Letters)
Source: Optics Letters - November 21, 2009 Category: Physics Authors: Cheng-Shan GuoLei-Lei LuHui-Tian Wang Source Type: journals

Optical switch based on a fluid-filled photonic crystal fiber Bragg gratingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We report the implementation of an in-fiber optical switch by means of filling a fluid into the air holes of a photonic crystal fiber with a fiber Bragg grating. Such a switch can turn on/off light transmission with an extinction ratio of up to 33 dB within a narrow wavelength range (Bragg ... (Source: Optics Letters)
Source: Optics Letters - November 21, 2009 Category: Physics Authors: Yiping WangWei JinLong JinXiaoling TanHartmut BarteltWolfgang EckeKlaus MoerlKerstin SchroederRon SpittelReinhardt WillschJens KobelkeManfred RothhardtLiye ShanSven Brueckner Source Type: journals

Precise balancing of viscous and radiation forces on a particle in liquid-filled photonic bandgap fiberEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A great challenge in microfluidics is the precise control of laser radiation forces acting on single particles or cells, while allowing monitoring of their optical and chemical properties. We show that, in the liquid-filled hollow core of a single-mode photonic crystal fiber, a micrometer-sized ... (Source: Optics Letters)
Source: Optics Letters - November 20, 2009 Category: Physics Authors: T. G. EuserM. K. GarbosJ. S. Y. ChenP. St.J. Russell Source Type: journals

Sandwiched long-period fiber grating filter based on periodic SU8-thick photoresist techniqueEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A loss-tunable sandwiched long-period fiber grating (SLPFG) filter is proposed in this Letter. This SLPFG utilized thick SU8 photoresist layers to induce refractive index modulations, and ultrahigh period precision was hence achieved. The external force required to tune this SLPFG filter is about ... (Source: Optics Letters)
Source: Optics Letters - November 20, 2009 Category: Physics Authors: Chia-Chin ChiangTsung-Chieh ChengHao-Jhen ChangLiren Tasi Source Type: journals

Extreme ultraviolet multilayer mirror with near-zero IR reflectanceEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We have developed a multilayer mirror for extreme ultraviolet (EUV) radiation that has low reflectance for IR radiation at 10.6 μm wavelength. The mirror is based on a multilayer coating comprising alternating layers of diamondlike carbon and silicon, for which we demonstrate an EUV ... (Source: Optics Letters)
Source: Optics Letters - November 20, 2009 Category: Physics Authors: W. A. SoerP. GawlitzaM. M. J. W. van HerpenM. J. J. JakS. BraunP. MuysV. Y. Banine Source Type: journals

Photowritten high-Q cavities in two-dimensional chalcogenide glass photonic crystalsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We demonstrate a high-Q(~125,000) photonic crystal (PhC) cavity formed using a postprocessing optical exposure technique where the refractive index of a photosensitive chalcogenide PhC is modified locally. The evolution of the cavity resonances was monitored in situ during writing using a tapered ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: Michael W. LeeChristian GrilletSnjezana Tomljenovic-HanicEric C. MägiDavid J. MossBenjamin J. EggletonXin GaiSteve MaddenDuk-Yong ChoiDouglas A. P. BullaBarry Luther-Davies Source Type: journals

Spectroscopic phase microscopy for quantifying hemoglobin concentrations in intact red blood cellsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We report a practical method for label-free quantification of specific molecules using spectroscopic imaging of sample-induced phase shifts. Diffraction phase microscopy equipped with various wavelengths of light source is used to record wavelength-dependent phase images. We first perform ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: YongKeun ParkToyohiko YamauchiWonshik ChoiRamachandra DasariMichael S. Feld Source Type: journals

Modeling of Z-scan characteristics for one-dimensional nonlinear photonic bandgap materialsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We propose a Z-scan theory for one-dimensional nonlinear photonic bandgap materials. The Z-scan characteristics for this material are analyzed. Results show that the Z-scan curves for photonic bandgap materials with nonlinear refraction are similar to those of uniform materials exhibiting both ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: Shuqi ChenWeiping ZangAxel SchülzgenXin LiuJianguo TianJerome V. MoloneyNasser Peyghambarian Source Type: journals

Numerical model for the temporal broadening of optical pulses propagating through weak atmospheric turbulenceEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In atmospheric optical communications, propagating pulses may be influenced by pulse spreading owing to turbulence, above all in scenarios characterized by sand and/or dust atmosphere. The long-term temporal broadening of a space-time Gaussian pulse propagating along a horizontal path through weak ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: Antonio Jurado-NavasJosé María Garrido-BalsellsMiguel Castillo-VázquezAntonio Puerta-Notario Source Type: journals

Full phase and amplitude control in computer-generated holographyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We report what we believe to be the first realization of a computer-generated complex-valued hologram recorded in a single film of photoactive polymer. Complex-valued holograms give rise to a diffracted optical field with control over its amplitude and phase. The holograms are generated by a ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: Markus FratzPeer FischerDominik M. Giel Source Type: journals

Continuous-wave sum-frequency generation in AlGaAs Bragg reflection waveguidesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Efficient sum-frequency generation in epitaxial GaAs/AlGaAs waveguides is reported. Phase matching is achieved for type II nonlinear interaction using Bragg reflection waveguides. Continuous-wave signal and pump in 1550 nm wavelength window were used for upconversion of photons to the 775 nm ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: Junbo HanPayam AbolghasemBhavin J. BijlaniAmr S. Helmy Source Type: journals

Low-power operation of vertically aligned liquid-crystal system via anatase-TiO_2 nanoparticle dispersionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Electro-optic performance of a liquid-crystal (LC) system is enhanced by TiO_2 nanoparticle dispersed in nematic liquid crystal (NLC). The 2.5 V threshold voltage of LC for device operation is lowered to 0.5 V through TiO_2 nanoparticle mixing up to 2 wt.%. To characterize the shape and size ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: Won-Kyu LeeJi-Hyuk ChoiHyun-Jae NaJi-Hun LimJeong-Min HanJeong-Yeon HwangDae-Shik Seo Source Type: journals

Correct self-assembling of spatial frequencies in super-resolution synthetic aperture digital holographyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Synthetic aperture enlargement is obtained, in lensless digital holography, by introducing a diffraction grating between the object and the CCD camera with the aim of getting super-resolution. We demonstrate here that the spatial frequencies are naturally self-assembled in the reconstructed image ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: Melania Paturzo Pietro Ferraro Source Type: journals

Closed-loop carrier-envelope phase stabilization with an acousto-optic programmable dispersive filterEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We demonstrate arbitrary carrier-envelope (CE) phase control of femtosecond laser pulses by an acousto-optic programmable dispersive filter (AOPDF), with an accuracy better than π/100 at a repetition rate of 1 kHz. We also demonstrate, for the first time to the best of our knowledge, 15 Hz ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: N. ForgetL. CanovaX. ChenA. JullienR. Lopez-Martens Source Type: journals

Three-photon-induced four-photon absorption and nonlinear refraction in ZnO quantum dotsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Three-photon-induced four-photon absorption via excited-state absorption and self-defocusing nonlinear refraction are reported for the first time, to our knowledge, in ZnO quantum dots with average sizes of 2.0+/-0.1 nm with 1064 nm radiation from a Q-switched Nd:YAG laser at a peak intensity of ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: M. ChattopadhyayP. KumbhakarC. S. TiwaryA. K. MitraU. ChatterjeeT. Kobayashi Source Type: journals

Nondiffracting wave properties in radially and azimuthally symmetric optical axis phase platesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A wave propagation analysis carried out in two kinds of q-plates having topological unit charge (1-plates), one plate with a radial orientation of the optical axis and the other with an azimuthal one, reveals that these devices admit nondiffracting Bessel beams as exact solutions of the vector ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: Pablo Vaveliuk Source Type: journals

Cs 894.3 nm laser pumped by photoassociation of Cs-Kr pairs: excitation of the Cs D_2 blue and red satellitesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Lasing on the D_1 transition (6P1/22-->6S1/22) of Cs has been observed by photoassociating Cs-Kr atomic pairs with a tunable, pulsed dye laser. Pumping of the blue or red satellites of the Cs D_2 line (6P3/22?6S1/22), peaking at ~841.1 nm and ~853 nm (respectively) in Cs/Kr/C_2H_6 gas mixtures, ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: J. D. ReadleJ. T. VerdeyenJ. G. EdenS. J. DavisK. L. Gabally-KinneyW. T. RawlinsW. J. Kessler Source Type: journals

Achromatic diffraction from polarization gratings with high efficiency: erratumEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In a previous letter [Opt. Lett.33, 2287 (2008)] the incorrect chiral-molecule concentrations of CB15 and ZLI-811 here provided. That error is corrected here. (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: Chulwoo Oh Michael J. Escuti Source Type: journals

Polarimetric surface plasmon resonance imaging biosensorEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We report the realization of a polarimetric surface plasmon resonance imaging system capable of dynamically resolving a change in the optical anisotropy of biochemical films. Anisotropies as small as 10^−3 refractive index unit on nanometer-thick samples can be resolved. As an example, we ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: Aurélien DuvalAude LaisnéDenis PomponSylvain HeldAlain BellemainJulien MoreauMichael Canva Source Type: journals

White-light cw-pumped supercontinuum generation in highly GeO_2-doped-core photonic crystal fibersEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We report ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: A. KudlinskiG. BouwmansO. VanvincqY. QuiquempoisA. Le RougeL. BigotG. MélinA. Mussot Source Type: journals

Supercontinuum Q-switched Yb fiber laser using an intracavity microstructured fiberEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We report on an intracavity configuration for supercontinuum generation in a Q-switched Yb fiber laser. The supercontinuum laser includes a section of microstructured fiber within the Q-switched laser cavity. With 380 mW of pump power, the supercontinuum laser can emit broadband pulses of 6 ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: J. Cascante-VindasA. DíezJ. L. CruzM. V. Andrés Source Type: journals

Vector solitons in nonlinear latticesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We consider two-component solitons in a medium with a periodic modulation of the nonlinear coefficient. The modulation enables the existence of complex multihump vector states. In particular, vector solitons composed of dipole and fundamental or dipole and even double-hump components exist and may ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: Yaroslav V. KartashovBoris A. MalomedVictor A. VysloukhLluis Torner Source Type: journals

Biconcave micro-optofluidic lens with low-refractive-index liquidsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We report the use of a low-RI liquid in a biconcave liquid-core liquid-cladding lens for focusing light. For the characterization of the lens, a telescope system was constructed ... (Source: Optics Letters)
Source: Optics Letters - November 19, 2009 Category: Physics Authors: Chaolong SongNam-Trung NguyenAnKrishna AsundiCassandra Lee-Ngo Low Source Type: journals

High-resolution photoaligned liquid-crystal micropolarizer array for polarization imaging in visible spectrumEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We report a superior high-resolution micropolarizer array fabrication technology that combines a linear polarizer with a micropatterned liquid-crystal (LC) cell. A 2 μm pitch is achieved by using UV light to define the orientation of the micropolarizer elements. Reported experimental results ... (Source: Optics Letters)
Source: Optics Letters - November 17, 2009 Category: Physics Authors: Xiaojin ZhaoAmine BermakFarid BoussaidTao DuVladimir G. Chigrinov Source Type: journals

Mode-locked 2 μm laser with highly thulium-doped silicate fiberEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We report self-starting passively mode-locked fiber lasers with a saturable absorber mirror using a piece of 30-cm-long newly developed highly thulium (Tm)-doped silicate glass fibers. The mode-locked pulses operate at 1980 nm with duration of 1.5 ps and energy of 0.76 nJ. This newly developed ... (Source: Optics Letters)
Source: Optics Letters - November 17, 2009 Category: Physics Authors: Q. WangJ. GengT. LuoS. Jiang Source Type: journals

Capacity limitations in fiber-optic communication systems as a result of polarization-dependent lossEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We characterize the effect of polarization dependent loss (PDL) on the information capacity of fiber-optic channels. The reduction in the outage capacity owing to the PDL is quantified as well as the signal-to-noise ratio margin that needs to be allocated for the PDL in order to avoid loss of ... (Source: Optics Letters)
Source: Optics Letters - November 17, 2009 Category: Physics Authors: Alon NaftaEado MeronMark Shtaif Source Type: journals

Twin removal in digital holography using diffuse illuminationEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A method to numerically remove the twin image for inline digital holography, using multiple digital holograms, is discussed. Each individual hologram is recorded by using a statistically independent speckle field to illuminate the object. If the holograms are recorded in this manner and then ... (Source: Optics Letters)
Source: Optics Letters - November 17, 2009 Category: Physics Authors: David S. MonaghanDamien P. KellyNitesh PandeyBryan M. Hennelly Source Type: journals

Silicon photonic wire biosensor array for multiplexed real-time and label-free molecular detectionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We demonstrate a silicon photonic wire waveguide biosensor array chip for the simultaneous monitoring of different molecular binding reactions. The chip is compatible with automated commercial spotting tools and contains a monolithically integrated microfluidic channel for sample delivery. Each ... (Source: Optics Letters)
Source: Optics Letters - November 14, 2009 Category: Physics Authors: A. DensmoreM. VachonD.-X. XuS. JanzR. MaY.-H. LiG. LopinskiA. DelâgeJ. LapointeC. C. LuebbertQ. Y. LiuP. ChebenJ. H. Schmid Source Type: journals

Fiber-coupled nanowire photon counter at 1550 nm with 24% system detection efficiencyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We developed a fiber-coupled superconducting nanowire single-photon detector system in a close-cycled cryocooler and achieved 24% and 22% system detection efficiencies at wavelengths of 1550 and 1315 nm, respectively. The maximum dark count rate was ~1000 counts/s. (Source: Optics Letters)
Source: Optics Letters - November 14, 2009 Category: Physics Authors: Xiaolong HuTian ZhongJames E. WhiteEric A. DaulerFaraz NajafiCharles H. HerderFranco N. C. WongKarl K. Berggren Source Type: journals

Optical investigation of band-edge structure and built-in electric field of AlGaN/GaN heterostructures by means of thermoreflectance, photoluminescence, and contactless electroreflectance spectroscopyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The band-edge property and built-in electric fields of two different Al_xGa_1−xN/GaN(AlGaN/GaN) heterostructures (HSs) with and without an additional AlGaN inserted layer were studied by thermoreflectance (TR), photoluminescence (PL), and contactless electroreflectance (CER) techniques. The ... (Source: Optics Letters)
Source: Optics Letters - November 14, 2009 Category: Physics Authors: Ching-Hwa Ho Jheng-Wei Lee Source Type: journals

Enhanced resolution in two-photon imaging using a TM_01 laser beam at a dielectric interfaceEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We have experimentally demonstrated that the resolution of a commercial two-photon microscope is improved using a TM_01 laser beam. With a water immersion objective having a 1.2 NA, the measured point- spread function has an area of 0.15λ^2. We used a plane interface between dielectrics ... (Source: Optics Letters)
Source: Optics Letters - November 14, 2009 Category: Physics Authors: Harold DehezMichel PichéYves De Koninck Source Type: journals

Optical vortices and singularities due to interference in atomic radiation near a mirrorEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We consider radiation emitted by an electric dipole close to a mirror. We have studied the field lines of the Poynting vector, representing the flow lines of the electromagnetic energy, and we show that numerous singularities and subwavelength optical vortices appear in this energy flow pattern. We ... (Source: Optics Letters)
Source: Optics Letters - November 13, 2009 Category: Physics Authors: Xin LiJie ShuHenk F. Arnoldus Source Type: journals

Generation ofEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We generate ultrabroadband pulses at 800 nm from an optical parametric amplifier (OPA) pumped by the second harmonic of a Ti:sapphire system and working at degeneracy. The OPA is seeded by a white-light continuum generated from a near-IR OPA pumped by the same laser. Nearly transform-limited (Source: Optics Letters)
Source: Optics Letters - November 13, 2009 Category: Physics Authors: A. M. SiddiquiG. CirmiD. BridaF. X. KärtnerG. Cerullo Source Type: journals

Competing nonlinearities in quadratic nonlinear waveguide arraysEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We demonstrate experimentally the existence of competing focusing and defocusing nonlinearities in a double-resonant system with quadratic nonlinear response. We use an array of periodically poled coupled optical waveguides and observe inhibition of the nonlinear beam self-action independent on ... (Source: Optics Letters)
Source: Optics Letters - November 13, 2009 Category: Physics Authors: Frank SetzpfandtDragomir N. NeshevRolSchiekFalk LedererAndreas TünnermannThomas Pertsch Source Type: journals

Creation of new lasing modes with spatially nonuniform gainEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We report on the creation of new lasing modes with spatially nonuniform profiles of optical gain in a one-dimensional random structure. It is demonstrated numerically that even without gain saturation and mode competition, the spatial nonuniformity of gain can cause dramatic and complicated ... (Source: Optics Letters)
Source: Optics Letters - November 13, 2009 Category: Physics Authors: Jonathan Andreasen Hui Cao Source Type: journals

Automatic deconvolution of 4Pi-microscopy data with arbitrary phaseEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We propose a maximum a posteriori-based method that solves an important practical problem in the deconvolution of 4Pi images by simultaneously delivering an estimate of both the object and the unknown phase. The method was tested in simulations and on data from both test samples and biological ... (Source: Optics Letters)
Source: Optics Letters - November 13, 2009 Category: Physics Authors: Giuseppe VicidominiStefan W. HellAndreas Schönle Source Type: journals

4¯-quasi-phase-matched interactions in GaAs microdisk cavitiesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We describe quasi-phase-matched nonlinear interactions in materials that possess 4¯ symmetry, such as GaAs. 4¯ symmetry together with curved propagation geometries produce quasi phase matching (QPM) without need of external domain inversions. To improve efficiency of nonlinear optical ... (Source: Optics Letters)
Source: Optics Letters - November 13, 2009 Category: Physics Authors: P. S. KuoW. FangG. S. Solomon Source Type: journals

Small core optical waveguides are more nonlinear than expected: experimental confirmationEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
For the first time, to our knowledge, we demonstrate the experimental confirmation of a new vectorially based expression of the effective nonlinear coefficient γ in bismuth suspended core fibers with core diameters of around 500 nm. The new expression predicts a significantly higher value of ... (Source: Optics Letters)
Source: Optics Letters - November 12, 2009 Category: Physics Authors: Shahraam Afshar V.Wen Qi ZhangHeike Ebendorff-HeidepriemTanya M. Monro Source Type: journals

All-fiber coherent combining of Er-doped amplifiers through refractive index control in Yb-doped fibersEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We propose a simple all-fiber solution for coherent beam combining of Er-doped fiber amplifiers. This method, which we believe to be a new method, employs the effect of refractive index changes in Yb-doped fibers induced at ~1.55 μm by optical pumping at ~980 nm, which is performed for an ... (Source: Optics Letters)
Source: Optics Letters - November 12, 2009 Category: Physics Authors: Andrei A. FotiadiNikita ZakharovOleg L. AntipovPatrice Mégret Source Type: journals

Near-field circular polarization probed by chiral polyfluoreneEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We demonstrate that a high degree of circular polarization can be delivered to the near field (NF) of an aperture at the apex of hollow-pyramid probes for scanning optical microscopy. This result is achieved by analyzing the dichroic properties of an annealed thin polymer film containing a chiral ... (Source: Optics Letters)
Source: Optics Letters - November 12, 2009 Category: Physics Authors: M. SavoiniP. BiagioniG. LakhwaniS. C. J. MeskersL. DuòM. Finazzi Source Type: journals

Tunable figure of merit for a negative-index metamaterial with a sandwich configurationEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Metamaterials with a free-standing Ag-SU-8-Ag sandwich configuration, perforated with a periodic array of cross-dipole apertures, are fabricated. The transmittance spectra of both experiment and simulation have indicated the existence of two transmission bands in mid-IR frequencies. The ... (Source: Optics Letters)
Source: Optics Letters - November 12, 2009 Category: Physics Authors: Xudong WangYong-Hong YeChao ZhengYao QinTie Jun Cui Source Type: journals

Broadband conversion of visible light to near-infrared emission by Ce^3+, Yb^3+-codoped yttrium aluminum garnetEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We show that Ce^3+ can be an efficient sensitizer for Yb^3+ in the host lattice of yttrium aluminum garnet (YAG). With blue-light excitation to induce the 4f-->5d transition of Ce^3+, characteristic near-IR emission of Yb^3+ due to transition of F5/22-->F7/22 peaking at 1030 nm is generated ... (Source: Optics Letters)
Source: Optics Letters - November 12, 2009 Category: Physics Authors: Xiaofeng LiuYu TengYixi ZhuangJunhua XieYanbo QiaoGuoping DongDanping ChenJianrong Qiu Source Type: journals

Seeding of a soft-x-ray laser in a plasma waveguide by high harmonic generationEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A strongly saturated waveguide-based optical-field-ionization soft-x-ray laser seeded by high harmonic generation was demonstrated for Ni-like Kr lasing at 32.8 nm. Compared with the same laser seeded only with spontaneous emission, seeding with high harmonics yields much smaller divergence, ... (Source: Optics Letters)
Source: Optics Letters - November 12, 2009 Category: Physics Authors: Ping-Hsun LinMing-Chang ChouMing-Jhe JiangPo-Chang TsengHsu-Hsin ChuJiunn-Yuan LinJyhpyng WangSzu-yuan Chen Source Type: journals