OSA's Digital Library

Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  •  

Optics InfoBase > JOSA B > Early Posting

Early Posting

Accepted papers to appear in an upcoming issue

OSA now posts prepublication articles as soon as they are accepted and cleared for production. See the FAQ for additional information.

Articles 1 to 20 of 35 Next Page >>

April


Saturable and inverse saturable absorption in multi-walled-carbon-nano-tubes-doped fast Sol-gel hybrid glasses

  • Raphi Dror, ZeeV Burshtein, Raz Gvishi, and Mariana Pokrass
  • received 01/14/2015; accepted 04/10/2015; posted 04/10/2015; Doc. ID 232480
  • [full text: PDF (631) KB)]
  • Abstract: Dynamics of saturable absorption and inverse saturable absorption of Multi walled carbon nano tubes (MWCNT)-doped fast Sol-gel hybrid glasses was studied by optical transmission of 532-nm laser beam pulses at two extreme conditions: 6-ns long temporally isolated single pulses up to 0.02 J/cm2, and a pulse train at different intensities in the range 0.72-10.7 kW/cm2 (quasi-CW illumination). The temporally isolated single pulses were analysed by the slow saturable absorber limit; The quasi-CW illumination at steady state was analysed by the fast inverse saturable absorber limit. A fresh, corrected solution to the rate equation was developed for the latter. The time dependence of reaching steady state absorption in the quasi-CW case was analysed by a numerical simulation of a state model. The single-pulse case analysis yields a ground-state density N=5.1×1015cm-3, a ground-state absorption cross-section σgs=5.5×10-15cm2 , and a first excited-state absorption cross-section σes1=3.6×10-15cm2. The quasi-CW case analysis is consistent with the occurrence of the MWCNT transition upon illumination into a highly absorbing/scattering state ("plasma" state). The analysis yields a ground-state concentration estimation N=3.2×1015cm-3, and a ground-state absorption cross-section σgs=6.3×10-15cm2. The "plasma" lower-state absorption/ scattering cross-section is σes2=2.3×10-14cm2. The light-intensity dependent transition rate between the first MWCNT excited-state and its "plasma" lower state followed the relation τ-1inc[s-1]=12.25exp(4×10-7I[W/cm2]); the transition rate between the lowest "plasma" state and the MWCNT ground-state, was also light-intensity dependent, following the relation τ-1[s-1]=3.5exp(2.54×10-7I[W/cm2]).

Keywords (OCIS):

  • (160.6060) Materials : Solgel
  • (190.4400) Nonlinear optics : Nonlinear optics, materials
  • (160.4236) Materials : Nanomaterials

Generating Hermite polynomial excited squeezed states by means of conditional measurements on a beam splitter

  • Hong-chun Yuan, Xue-xiang Xu, and Hong-yi Fan
  • received 02/05/2015; accepted 04/09/2015; posted 04/14/2015; Doc. ID 234066
  • [full text: PDF (784) KB)]
  • Abstract: A scheme for conditional generating a Hermite polynomial excited squeezed vacuum states (HESVS) is proposed. Injecting a two-mode squeezed vacuum state (TMSVS) into a beam splitter (BS) and counting the photons in one of the output channels, the conditional state in the other output channel is just a HESVS. To exhibit a number of nonclassical effects and non-Gaussianity, we mainly investigate the photon number distribution, sub-Poissonian distribution, quadrature component distribution, and quasi-probability distribution of the HPESVS. We find that its nonclassicality closely relates to the control parameter of the BS, the squeezed parameter of the TMSVS, and the photon number of conditional measurement. These further demonstrate that performing the conditional measurement on a BS is an effective approach to generate non-Gaussian state.

Keywords (OCIS):

  • (270.4180) Quantum optics : Multiphoton processes
  • (270.5290) Quantum optics : Photon statistics
  • (270.5570) Quantum optics : Quantum detectors

Long baseline weak-thermal-light interferometry with noiseless linear amplification

  • WanSu Bao, XuBo Zou, Guang-can Guo, NingJuan Ruan, ZhiQiang Wu, and XuLing Lin
  • received 08/04/2014; accepted 04/07/2015; posted 04/09/2015; Doc. ID 220415
  • [full text: PDF (608) KB)]
  • Abstract: Long baseline weak-thermal-light interferometry is widely used for retrieving astronomical information from array of telescopes. However, optic loss in the baseline severely limits the length of baseline and thus limit the resolution of interferometries. In this paper, we consider the elimination of optic loss with quantum noiseless linear amplification(NLA). With a success probability of $1.98\times 10^{-3}$, one could implement a $100$ km long baseline interferometry, via $1550 \mathrm{nm}$ quantum communication. This shows the power quantum information technique and its application in astronomic interferometry. Finally, the comparison with recent entanglement-assisted method is also investigated.

Keywords (OCIS):

  • (270.0270) Quantum optics : Quantum optics
  • (270.5565) Quantum optics : Quantum communications

Effects of engineering initial states and quantum interference near the edge of a photonic band gap on the entanglement

  • haozhen Li, shuangyuan xie, Xu Jingping, and Yaping Yang
  • received 10/14/2014; accepted 04/07/2015; posted 04/09/2015; Doc. ID 224912
  • [full text: PDF (637) KB)]
  • Abstract: The entanglement dynamics of a V-type three-level atom and its radiation field near the band edge of a photonic crystal is investigated. It is shown that the entanglement dynamics experiences periodic oscillation behavior with a constant amplitude, and can be enhanced or reduced by the quantum interference between the two atomic transitions. These properties depend strongly on the relative position between the upper levels and the band edge, and on the initial state of the atom. There is a special position at which the time evolution of the entanglement changes from oscillation to constant in the long time limits.

Keywords (OCIS):

  • (270.0270) Quantum optics : Quantum optics
  • (050.5298) Diffraction and gratings : Photonic crystals
  • (270.5585) Quantum optics : Quantum information and processing

Post-compression of high energy terawatt-level femtosecond pulses and application to high order harmonic generation

  • Ondrej Hort, Eric Constant, Antoine Dubrouil, Eric MEVEL, Dominique Descamps, Amélie Cabasse, and Stephane Petit
  • received 02/25/2015; accepted 04/07/2015; posted 04/10/2015; Doc. ID 234143
  • [full text: PDF (1653) KB)]
  • Abstract: We perform a post-compression of high energy pulses by using optical-field ionization of low pressure helium gas in a guided geometry. We apply this approach to a TW chirped-pulse-amplification based Ti:Sapphire laser chain and show that spectral broadening can be controlled both with the input pulse energy and gas pressure. Under optimized conditions, we generate 10 fs pulses at TW level directly under vacuum and demonstrate a high stability of the post compressed pulse duration. These high energy post-compressed pulses are thereafter used to perform high harmonic generation in a loose focusing geometry. The XUV beam is characterized both spatially and spectrally on a single shot basis and structured continuous XUV spectra are observed.

Keywords (OCIS):

  • (140.7090) Lasers and laser optics : Ultrafast lasers
  • (190.4160) Nonlinear optics : Multiharmonic generation
  • (260.7200) Physical optics : Ultraviolet, extreme
  • (320.5520) Ultrafast optics : Pulse compression
  • (320.7110) Ultrafast optics : Ultrafast nonlinear optics

2D atom localization via phase-sensitive absorption-gain spectra in five-level hyper inverted-Y atomic systems

  • Wen-Xing Yang, Zhonghu Zhu, Aixi Chen, Shaopeng Liu, and Ray-Kuang Lee
  • received 02/26/2015; accepted 04/07/2015; posted 04/10/2015; Doc. ID 235152
  • [full text: PDF (773) KB)]
  • Abstract: A scheme for realizing two-dimensional (2D) atom localization in the sub-wavelength domain is proposed in a microwave-driven five-level hyper inverted-Y atomic system, in which the atom interacts with a weak probe field, two control fields together with two orthogonal standing-wave fields. Due to the spatially dependent atom-field interaction, the information about the position of the atom can be directly extracted out from the absorption and gain spectra of the weak probe field. It is found that the probe detuning, the intensities of two control fields and the relative phase of the driving fields can significantly improve the localization precision. Moreover, the maximal probability of finding the atom at an expected position in the sub-wavelength domain of the standing-wave field can reach unity via properly adjusting the system parameters.

Keywords (OCIS):

  • (020.1670) Atomic and molecular physics : Coherent optical effects
  • (020.5580) Atomic and molecular physics : Quantum electrodynamics

Running electric field gratings for detection of coherent radiation

  • Germano Montemezzani, Virginie Coda, Massimo Alonzo, Peter Günter, and Mojca Jazbinsek
  • received 03/03/2015; accepted 04/07/2015; posted 04/10/2015; Doc. ID 235547
  • [full text: PDF (653) KB)]
  • Abstract: A technique for the room temperature electro-optic detection of coherent low-frequency radiation, typically in the far infrared or THz range, is proposed. It relies on a longitudinally running electric field grating probed by phase-matched Raman-Nath diffraction of a higher frequency wave. The expected probe wave diffracted intensity is background-free and is proportional to the desired signal intensity. As an example we present model calculations for the probing of monochromatic THz radiation using the organic crystal 4-N,N-dymethylamino-4'-N'-methyl-stilbazolium 2,4,6-trimethylbenzenesulfonate (DSTMS) as nonlinear optical sensor material, for which new measurements of the refractive index and absorption up to a frequency of 11 THz are presented.

Keywords (OCIS):

  • (190.4710) Nonlinear optics : Optical nonlinearities in organic materials
  • (230.2090) Optical devices : Electro-optical devices
  • (190.2055) Nonlinear optics : Dynamic gratings
  • (040.2235) Detectors : Far infrared or terahertz

Strong circular dichroism of core-shell magnetoplasmonic nanoparticles

  • Aristi Christofi, Paris Varytis, N. Stefanou, and Nikolaos Papanikolaou
  • received 03/26/2015; accepted 04/03/2015; posted 04/09/2015; Doc. ID 237027
  • [full text: PDF (1009) KB)]
  • Abstract: Composite magnetoplasmonic nanoparticles with a core-shell morphology exhibit intriguing optical properties and offer impressive opportunities for tailoring in a controllable manner the light-matter interaction at subwavelength dimensions. These properties are usually analyzed in the framework of the quasistatic approximation which, however, is often inadequate and thus a full electrodynamic treatment is required. In this respect, we developed a rigorous method for an accurate description of electromagnetic scattering by a gyrotropic sphere coated with a nongyrotropic concentric spherical shell, based on the full multipole expansion of the wave field. The method was applied on specific examples of core-shell cobalt-silver spherical nanoparticles, where the occurrence of strong circular dichroism induced by magnetoplasmonic interaction, which largely exceeds that of homogeneous noble metal nanoparticles in an external magnetic field, was found and the results were consistently interpreted.

Keywords (OCIS):

  • (050.1930) Diffraction and gratings : Dichroism
  • (210.3820) Optical data storage : Magneto-optical materials
  • (250.5403) Optoelectronics : Plasmonics

Thermally induced beam distortions in laser ceramics at strong birefringence

  • Anton Vyatkin and Efim Khazanov
  • received 01/20/2015; accepted 04/03/2015; posted 04/03/2015; Doc. ID 232891
  • [full text: PDF (2310) KB)]
  • Abstract: A new method of calculating quality parameters of a beam that has passed through laser ceramics whose grains are large compared to the wavelength at an arbitrary value of thermally induced birefringence has been developed. The intensity of a large-scale field in initial and orthogonal polarizations has been found. The results fully agree with the thermally induced distortions calculated by other methods. The intensity of a large-scale field was also obtained within the framework of the Rayleigh-Debye scattering theory for arbitrary size of ceramic granules.

Keywords (OCIS):

  • (140.3580) Lasers and laser optics : Lasers, solid-state
  • (140.6810) Lasers and laser optics : Thermal effects
  • (260.1440) Physical optics : Birefringence
  • (140.3295) Lasers and laser optics : Laser beam characterization
  • (260.2710) Physical optics : Inhomogeneous optical media

March


Surface Plasmon Sorting and Engineered Dispersion Curves using Multilayer Doped Semiconductors

  • Young Uk Jung, ISroel Mandel, Igor Bendoym, Andrii Golovin, and David Crouse
  • received 01/13/2015; accepted 03/31/2015; posted 04/03/2015; Doc. ID 231112
  • [full text: PDF (1660) KB)]
  • Abstract: A method to engineer complex shapes into the dispersion curves (DCs) of surface plasmon (SP) in flat multilayer structures composed of doped semiconductors is shown both analytically and numerically. It is shown that the shapes of SP DCs in multilayer structures can be engineered by controlling the not only the free electron density in each layer, as has been well described in past literature on the subject, but also by controlling the spatial profiles of the electromagnetic fields associated with surface plasmons. It is the ability to impart complex shapes in the SP DCs that is new and described in this paper, and not just raising or lowering the surface plasmon energies as a function of free electron concentration. DCs with stair-step shapes or dove-tails shapes are possible. In this work, a method to design structures that support SPs with DCs of arbitrary shapes of SP DCs is described. An analytical description of the design methodology is developed, and the resulting structures are numerically modeled using both continuous wave excitation and time-dependent pulsed excitations. Time domain studies of the creation and decay the SPs are performed, and the spatial sorting of the SPs are studied, and yield results in agrement with the predictions of the analytic model.

Keywords (OCIS):

  • (160.6000) Materials : Semiconductor materials
  • (240.6680) Optics at surfaces : Surface plasmons
  • (160.3918) Materials : Metamaterials
  • (250.5403) Optoelectronics : Plasmonics

Full vector-field control of ultrashort laser pulses utilizing a single dual-layer SLM in a common-path setup

  • Tobias Brixner, Christoph Schwarz, and Ole Hüter
  • received 12/11/2014; accepted 03/31/2015; posted 03/31/2015; Doc. ID 230563
  • [full text: PDF (3572) KB)]
  • Abstract: We present a design for shaping femtosecond laser pulses in amplitude, phase, and polarization by manipulating two perpendicular polarization components in two arms of an interferometric common-path setup. A thin-film polarizer is used for polarization splitting and recombination to avoid angular dispersion and phase variations across the beam profile. We demonstrate how the optimal design parameters can be found by numerical calculations and present an on-the-fly phase reduction and stabilization (OPRAS) routine to automatically compress the pulse and improve the long-term stability of the setup. Examples of deterministically generated polarization-shaped multipulse sequences prove the capabilities of the setup.

Keywords (OCIS):

  • (230.6120) Optical devices : Spatial light modulators
  • (260.5430) Physical optics : Polarization
  • (320.5540) Ultrafast optics : Pulse shaping
  • (320.7080) Ultrafast optics : Ultrafast devices
  • (320.7160) Ultrafast optics : Ultrafast technology

Laser Cooling without Spontaneous Emission using the Bichromatic Force*

  • Harold Metcalf, Christopher Corder, Brian Arnold, and xiang Hua
  • received 01/15/2015; accepted 03/31/2015; posted 03/31/2015; Doc. ID 232627
  • [full text: PDF (4001) KB)]
  • Abstract: It is widely believed that spontaneous emission is necessary to remove entropy from an atomic sample during laser cooling. In this paper we show that this is not so. In fact, spontaneous emission is needed for energy removal when laser cooling is done with single frequency light, but with more than one frequency, both energy and entropy can be removed using only stimulated processes. Our experiment works by restricting the atom-light interaction to a time short compared to a cycle of absorption followed by natural decay. This is achieved by using the bichromatic force on an atomic transition with a relatively long excited state lifetime and a relatively short cooling time so that spontaneous emission effects are minimized. We have done simulations of the motion of atoms under the bichromatic force and they compare well with our data. We have made numerous tests to support the assertion that it is only the bichromatic force at work in our experiment. This accomplishment is of interest to direct laser cooling of molecules or in experiments where working space or time is limited.

Keywords (OCIS):

  • (140.3320) Lasers and laser optics : Laser cooling
  • (020.1335) Atomic and molecular physics : Atom optics
  • (020.3320) Atomic and molecular physics : Laser cooling

Far field narrowing in spatially modulated broad area edge-emitting semiconductor amplifiers

  • Mindaugas Radziunas, Ramon Herrero, Muriel Botey, and Kestutis Staliunas
  • received 02/04/2015; accepted 03/30/2015; posted 04/03/2015; Doc. ID 234035
  • [full text: PDF (1036) KB)]
  • Abstract: We perform a detailed theoretical analysis of the far field narrowing in broad-area edge-emitting semiconductor amplifiers that are electrically injected through the contacts periodically modulated in both, longitudinal and transverse, directions. The beam propagation properties within the semiconductor amplifier are explored by a (1+2)-dimensional traveling wave model and its coupled mode approximation. Assuming a weak field regime, we analyze the impact of different parameters and modulation geometry on the narrowing of the principal far field component.

Keywords (OCIS):

  • (000.3860) General : Mathematical methods in physics
  • (070.6110) Fourier optics and signal processing : Spatial filtering
  • (080.2720) Geometric optics : Mathematical methods (general)
  • (250.5980) Optoelectronics : Semiconductor optical amplifiers
  • (050.5298) Diffraction and gratings : Photonic crystals

Hyperbolic Metamaterial Feasible for Fabrication with Direct Laser Writing Processes

  • Durdu Guney, Xu Zhang, and Sanjoy Debnath
  • received 01/21/2015; accepted 03/28/2015; posted 04/03/2015; Doc. ID 232762
  • [full text: PDF (954) KB)]
  • Abstract: Stimulated emission depletion microscopy inspired direct laser writing (STED-DLW) processes can offer diffraction-unlimited fabrication of 3D-structures, not possible with traditional electron-beam or optical lithography. We propose a hyperbolic metamaterial for fabrication with STED-DLW. First, we design meandering wire structures with three different magnetic dipoles which can be excited under different incidences of light. Then, based on effective parameters corresponding to normal incidence and lateral incidence, we find that the hyperbolic dispersion relation for five-layer structure appears between 15THz to 20 THz. Finally, we investigate the influence of imaginary parts of the effective parameters on the metamaterial dispersion. The proposed metamaterial structure has also potential for three-dimensionally isotropic permeability despite geometric anisotropy.

Keywords (OCIS):

  • (220.0220) Optical design and fabrication : Optical design and fabrication
  • (260.2030) Physical optics : Dispersion
  • (160.3918) Materials : Metamaterials

Bloch oscillations in an optical lattice generated by a laser source based on a fiber amplifier: decoherence effects due to amplified spontaneous emission

  • Saida GUELLATI-KHELIFA, Manuel ANDIA, Pierre CLADÉ, François BIRABEN, and Etienne WODEY
  • received 12/19/2014; accepted 03/26/2015; posted 04/01/2015; Doc. ID 231143
  • [full text: PDF (772) KB)]
  • Abstract: We present the development of a laser source generated by frequency doubling of a seed laser at 1560 nm using a periodically poled lithium niobate (PPLN) crystal. The seed laser passes through a 30 W fiber amplifier. The laser source at 780 nm is used to perform Bloch oscillations of ultra-cold atoms in an optical lattice. In this paper we investigate the decoherence effects induced by the amplified spontaneous emission (ASE) in the gain medium. We show that the ASE drastically reduces the efficiency of Bloch oscillations. We totally filter out the ASE around the D2-line using a heated rubidium vapor cell. We precisely determine the power spectral density of the ASE by measuring the fraction of atoms transferred from the hyperfine level F = 1 to F = 2, when the laser is switched on.

Keywords (OCIS):

  • (020.1670) Atomic and molecular physics : Coherent optical effects
  • (060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
  • (270.2500) Quantum optics : Fluctuations, relaxations, and noise
  • (020.1335) Atomic and molecular physics : Atom optics

The Hong-Ou-Mandel interference between independent sources of heralded ultra-fast single photons: Influence of chirp

  • Liang Cui, xiaoxin ma, and Xiaoying Li
  • received 07/01/2014; accepted 03/25/2015; posted 03/25/2015; Doc. ID 215080
  • [full text: PDF (1162) KB)]
  • Abstract: For the quantum interference between two truly independent heralded single photon sources (HSPSs), which are generated from the spontaneous parametric processes pumping with ultra-fast laser pulses, the visibility of Hong-Ou-Mandel interference will be degraded by the mode mismatch. The influence of the purity of HSPSs has been extensively investigated, here we show that the chirp of HSPSs will change the pulse duration of ultra-fast single photons and introduce additional mode mismatch. To obtain the high visibility interference, in addition to improving the purity, the chirp of HSPSs which may originated form the pulsed pump fields and the propagation media of HSPSs should be properly managed. Our theoretical analysis shows the methods for minimizing the chirp induced mode mismatch depend on the bandwidth and phase matching condition of the HSPSs. Our study is useful for designing the Hong-Ou-Mandel interferometers in quantum information processing.

Keywords (OCIS):

  • (270.5290) Quantum optics : Photon statistics
  • (270.5530) Quantum optics : Pulse propagation and temporal solitons
  • (190.4975) Nonlinear optics : Parametric processes
  • (270.5585) Quantum optics : Quantum information and processing

Time-average forces over dielectric and negative-index Rayleigh particles by superposition of equal-frequency Bessel beams

  • Leonardo Ambrosio and Mariana Ferreira
  • received 01/07/2015; accepted 03/24/2015; posted 03/25/2015; Doc. ID 232006
  • [full text: PDF (1303) KB)]
  • Abstract: In this paper, optical forces exerted by suitable superposition of equal-frequency Bessel beams - Frozen Waves (FWs) - over dielectric, metallic or negative-index particles are investigated for the Rayleigh regime. FWs are capable of providing virtually any desired longitudinal intensity pattern by adequately superposing 2N + 1 (N integer) Bessel beams of the same but otherwise arbitrary order, thus serving as potential beams in optical trapping, atom guiding, optical bistouries and so on. Analytical expressions for gradient and scattering forces are deduced from Lorentz force law, and numerical examples are provided based on three specific longitudinal intensity patterns, revealing that these types of beams could, in principle, provide effective 3D traps in multiple transverse planes.

Keywords (OCIS):

  • (050.1940) Diffraction and gratings : Diffraction
  • (140.3460) Lasers and laser optics : Lasers
  • (170.4520) Medical optics and biotechnology : Optical confinement and manipulation
  • (290.5870) Scattering : Scattering, Rayleigh

Modeling the nonlinear photoabsorptive behavior during self-written waveguide formation in a photopolymer

  • John Sheridan, Haoyu Li, Yue Qi, and raed Malallah
  • received 01/14/2015; accepted 03/22/2015; posted 03/25/2015; Doc. ID 232595
  • [full text: PDF (981) KB)]
  • Abstract: Photopolymer materials can be used as recording media for self-written waveguides (SWWs) as they can exhibit large refractive index change and high photo-sensitivity. In free radical photo-polymerization systems, the dyes, functioning as the photosensitizer, strongly influence the material properties. During photo-illumination the spatial and temporal evolution of the dye concentration is an important factor leading to nonlinear absorption. In this paper, based on an investigation of the photochemical mechanisms, we analyze the nonlinear photo-absorptive effect during the photo-initiation processes. The time varying exposing light distribution is calculated and used to iteratively estimate the evolving cross sectional refractive index and loss coefficient values. The model enables a more accurate and physical description of the optically induced growth of SWWs in such systems. Then SWWs formed in dry acrylamide/polyvinyl alcohol (AA/PVA) based photopolymer samples, containing different initial dye concentrations, are experimentally examined. The nonlinear absorptive behavior is quantified by comparing the model predictions and the experimental results.

Keywords (OCIS):

  • (130.4310) Integrated optics : Nonlinear
  • (160.5470) Materials : Polymers
  • (250.5460) Optoelectronics : Polymer waveguides
  • (260.5950) Physical optics : Self-focusing
  • (160.5335) Materials : Photosensitive materials

Experimental and theoretical study of passively Q-switched Nd:LuAG laser at 1.3 µm with V3+:YAG saturable absorber

  • Cheng Liu, Shengzhi Zhao, Guiqiu Li, Kejian Yang, Dechun Li, Tao Li, qiaowen chao, Tianli Feng, and Xintian Chen
  • received 12/10/2014; accepted 03/22/2015; posted 04/03/2015; Doc. ID 229202
  • [full text: PDF (3157) KB)]
  • Abstract: We report the characteristics of a diode-pumped continuous-wave (CW) and passively Q-switched Nd:LuAG laser emitting 1.3 µm wavelength. A maximum average output power of 954 mW was obtained under CW operation, giving a slope efficiency of 14.7 %. With an V3+:YAG crystal wafer employed as saturable absorber, the passively Q-switched Nd:LuAG laser produced a minimum pulse duration of 17 ns under a repetition rate of 8 kHz, and a maximum single pulse energy of 18.9 µJ. A rate equation model is introduced to theoretically analyze the results obtained in the experiment, in which the Gaussian spatial distribution of the intracavity photon density and the longitudinal distribution of the photon density along the cavity axis are taken into account. The results of numerical calculations of the rate equations are consistent with the experimental results. The results indicated the Nd:LuAG crystal as promising gain medium for achieving short pulses with high energy at 1.3 µm

Keywords (OCIS):

  • (140.3460) Lasers and laser optics : Lasers
  • (140.3480) Lasers and laser optics : Lasers, diode-pumped
  • (140.3540) Lasers and laser optics : Lasers, Q-switched

A Step-by-step Guide to the Realisation of Advanced Optical Tweezers

  • Giuseppe Pesce, Giorgio Volpe, Philip Jones, Onofrio Marago, Sylvain Gigan, Antonio Sasso, and Giovanni Volpe
  • received 02/04/2015; accepted 03/21/2015; posted 03/31/2015; Doc. ID 233555
  • [full text: PDF (4675) KB)]
  • Abstract: Since the pioneering work of Arthur Ashkin, optical tweezers have become an indispensable tool for contactless manipulation of micro- and nanoparticles. Nowadays optical tweezers are employed in a myriad of applications demonstrating the importance of these tools. While the basic principle of optical tweezers is the use of a strongly focussed laser beam to trap and manipulate particles, ever more complex experimental set-ups are required in order to perform novel and challenging experiments in order to meet this need. With this article, we provide a detailed step-by-step guide for the construction of advanced optical manipulation systems. First, we explain how to build a single-beam optical tweezers on a home-made microscope and how to calibrate it. Improving on this design, we realize a holographic optical tweezers, which can manipulate independently multiple particles and generate more sophisticated wavefronts such as Laguerre-Gaussian beams. Finally, we explain how to implement a speckle optical tweezers.

Keywords (OCIS):

  • (030.6140) Coherence and statistical optics : Speckle
  • (090.1760) Holography : Computer holography
  • (120.4640) Instrumentation, measurement, and metrology : Optical instruments
  • (170.4520) Medical optics and biotechnology : Optical confinement and manipulation
  • (350.4855) Other areas of optics : Optical tweezers or optical manipulation

Articles 1 to 20 of 35 Next Page >>





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings