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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.

A certification scheme for the boson sampler

Kai Liu, Austin Lund, Yong-jian Gu, and Timothy Ralph

Doc ID: 261698 Received 13 Apr 2016; Accepted 22 Jul 2016; Posted 22 Jul 2016  View: PDF

Abstract: Boson sampling can provide strong evidence that the computational power of a quantum computer outperforms a classical one via currently feasible linear optics experiments. However, how to identify an actual boson sampling device against any classical computing imposters is an ambiguous problem due to the computational complexity class in which boson sampling lies. The certification protocol based on bosonic bunching fails to rule out the so-called mean-field sampling. We propose a certification scheme to distinguish the boson sampling from the mean-field sampling for any random scattering matrices chosen via the Harr-measure. We numerically analyze our scheme and the influence of imperfect input states caused by non-simultaneous arrival photons.

New features of the three-phonon acousto-optical interaction due to elastic waves of finite amplitude and an advanced spectrum analysis of optical signals

Adan Omar Arellanes Bernabe and Alexandre Shcherbakov

Doc ID: 264263 Received 28 Apr 2016; Accepted 22 Jul 2016; Posted 22 Jul 2016  View: PDF

Abstract: The unexpected features of square-law nonlinearity inherent in the non-collinear three-phonon acousto-optical interaction controlled by elastic waves of finite amplitude in birefringent crystals with linear acoustic attenuation are distinguished and investigated. They lead to breakthrough applications of strongly nonlinear three-phonon interaction to linear optical spectrum analysis with ~100% efficiency and qualitatively improved resolution. Principally new physical degree of freedom, unique for this nonlinear phenomenon, is revealed and characterized. The indispensable theoretical developments and proof-of-principle acousto-optical experiments with specially designed wide-aperture tellurium dioxide cell are presented. The obtained experimental results confirm the elaborated approaches promising potentially the highest possible spectral resolution that one can expect in principle from acousto-optical technique within optical spectrum analysis.

Quantum and thermal noise limits of coupled resonators optical waveguide and resonant waveguide optical rotation sensors

Jacob Scheuer

Doc ID: 264796 Received 09 May 2016; Accepted 22 Jul 2016; Posted 22 Jul 2016  View: PDF

Abstract: We analyze theoretically the performance limitations of coupled resonator optical waveguides (CROWs) and a single passive resonator of the same area for rotation sensing applications. We show that when the dominant noise sources are of quantum (shot) or thermal origin, the single passive resonator outperforms the CROW regardless the propagation loss in the waveguides. We also show that optimizing the design parameters of the CROW and the single ring cavity according to the dominant noise source can improve the minimal detectable rotation rate by almost 50%.

Diffusive to quasi-ballistic random laser: incoherent and coherent models

William Guerin, Yidong Chong, Quentin Baudouin, Robin Kaiser, matthias liertzer, and Stefan Rotter

Doc ID: 268155 Received 13 Jun 2016; Accepted 20 Jul 2016; Posted 21 Jul 2016  View: PDF

Abstract: We study the crossover between the diffusive and quasi-ballistic regimes of random lasers. In particular, we compare incoherent models based on the diffusion equation and the radiative transfer equation (RTE), which neglect all wave effects, with a coherent wave model for the random laser threshold. We show that both the incoherent and the coherent models predict qualitatively similar thresholds, with a smooth transition from a diffuse to a quasi-ballistic regime. The shape of the intensity distribution in the sample as predicted by the RTE model at threshold is also in good agreement with the coherent model. The approximate incoherent models thus provide useful analytical predictions for the threshold of random lasers as well as the shape of the random laser modes at threshold.

An analytical study of mismatched complementary media

Lin Zhu, Xudong Luo, and Hongru Ma

Doc ID: 262067 Received 01 Apr 2016; Accepted 18 Jul 2016; Posted 21 Jul 2016  View: PDF

Abstract: Complementary media (CM) interacting with arbitrarily situated obstacles are usually less discussed. In this paper, an analytical framework based on multiple scattering theory is established for analyzing such a mismatched case. As examples, CM-based devices, i.e., a superlens and superscatterer, are discussed. From an analysis, the cancellation mechanism of the mismatched CM is studied. In addition, numerical results are provided for illustration. Moreover, further study shows that such cancellation effects might rely on specific conditions. Actually, the conclusions are not restricted to any specific frequencies; they could be extended to many other areas including applications to active cloaking, antennas, and wireless power transfer.

Design of Cross-talk Free Polarization Converter Based on Square Lattice Elliptical-Hole Core Circular-Hole Holey Fibers

Zhang Zejun, Yasuhide Tsuji, and Masashi Eguchi

Doc ID: 262543 Received 04 Apr 2016; Accepted 18 Jul 2016; Posted 21 Jul 2016  View: PDF

Abstract: In this paper, a novel polarization converter (PC) based on square lattice elliptical-hole core circular-hole holey fibers (EC-CHFs) is proposed and analyzed. The proposed PC has oblique elliptical air holes in the core region, which can achieve polarization rotation with a conversion length as short as 31.7 mm. Additionally, in order to achieve a cross-talk free PC element, we propose a PC element with three cores which can completely convert polarization state by 90 degrees. The structural tolerance of the cross-talk free PC element has also been discussed in detail.

Cr:YAG passively Q-switched single-frequency Nd:YVO4 ring cavity laser

Junwen Xue, Ying Pan, Wei Chen, Yujie Fang, Haijun Xie, Mingyuan Xie, Lu Sun, and Binghua Su

Doc ID: 267880 Received 06 Jun 2016; Accepted 18 Jul 2016; Posted 21 Jul 2016  View: PDF

Abstract: We design and demonstrate a thermally stable four-mirror discrete-component ring cavity for Q-switched laser output. An 880-nm fiber-coupled laser diode is used to pump a-cut Nd:YVO4 directly. A magnetic rotation glass (MR3-2) inserted into a permanent cylinder magnet, in combination with a half-wave plate and the polarized emission properties of Nd:YVO4, is used to obtain unidirectional laser operation. With this setup, for a pump power of 5 W, 2.75 W of continuous 1064-nm single-frequency laser output is obtained. Next, a Cr:YAG passive-Q crystal with small signal transmittance of 75% is inserted in between the two concave mirrors where the beam waist is located. Consequently, a passive Q-switching single-frequency linear polarization pulse with an average power of 1.02 W, pulse width of 60 ns, frequency of 21 kHz, peak power of 810 W, and single-pulse energy of 48 μJ is obtained. Further, we also propose a new method of using a Fabry–Pérot (FP) scanning interferometer to observe high-repetition rate Q-switched pulse output longitudinal-mode signals.

Broad band fiber optical parametric amplifier pumped by two chirped pulses

Damien Bigourd, Coralie Fourcade-Dutin, Olivier Vanvincq, and Emmanuel Hugonnot

Doc ID: 264603 Received 04 May 2016; Accepted 12 Jul 2016; Posted 13 Jul 2016  View: PDF

Abstract: Optical parametric amplifier pumped by two chirped pump pulses has been analytically and numerically investigated to predict the spectral gain bandwidth and its temporal distribution. We highlighted that the properties of the amplifier depend strongly on the relative chirp values and an uniform spectro-temporal gain can be obtained when the two chirps have opposite signs. A chirped signal pulse with a very broad bandwidth has also been combined to demonstrate the amplification of ultra-short pulse with this amplifier.

Plasmonic nanodipole antenna array with extra arms for sensing applications

Najmeh Nozhat and Samira Amiri

Doc ID: 256021 Received 17 Dec 2015; Accepted 07 Jul 2016; Posted 12 Jul 2016  View: PDF

Abstract: In this paper, a periodic array of plasmonic nanodipole antennas with extra arms for sensing applications has been proposed. The extra arms provide more hot spots in the sensing regime and so the electric field intensity is enhanced in comparison to the simple nanodipole. The optical responses of both simple nanodipole and the proposed nanodipole with the extra arms, which includes the transmission, the reflection and the absorption spectra of the system, have been studied. It has been shown that the sensitivity of the proposed plasmonic nanodipole antennas array with the extra arms is much higher than the simple one. Moreover, by replacing the substrate from Si to SiO2, the sensitivity increases up to 1420 nm/RIU and 1350 nm/RIU at the wavelengths of 1310 nm and 1550 nm, respectively, that is very suitable for sensing applications. The simulations are based on the finite-difference time-domain (FDTD) numerical method.

Magneto-optical coaxial waveguide with toroidal magnetization

Nikolay Gusev, Andrey Kalish, Anatoliy Zvezdin, and Vladimir Belotelov

Doc ID: 256280 Received 22 Dec 2015; Accepted 07 Jul 2016; Posted 08 Jul 2016  View: PDF

Abstract: Plasmoniс and guided modes of a waveguide constituted by metal walls and a magnetic dielectric core are investigated to reveal how their dispersion and optical field distribution are influenced by a toroidal (azimuthal) magnetization of the core. A phenomenon of the magneto-optical nonreciprocity both in wavenumber and in attenuation coefficient is identified and investigated. It is shown that in the coaxial golden waveguide with the iron-garnet core the nonreciprocity effect reaches maximal values for the plasmonic modes at frequencies above 3×1015 rad/s. The effect is of opposite sign for the two types of the plasmonic modes and its value can be tuned by adjusting the geometrical parameters.

A phase shift formulation for N-light-pulse atom interferometers : application to inertial sensing

Malo Cadoret, Nassim Zahzam, Yannick Bidel, Clément Diboune, Fabien Théron, Alexis Bonnin, and Alexandre Bresson

Doc ID: 265504 Received 18 May 2016; Accepted 03 Jul 2016; Posted 07 Jul 2016  View: PDF

Abstract: We report on an original and simple formulation of the phase shift in N-light-pulse atom interferometers.We consider atomic interferometers based on two-photon transitions (Raman transitions or Bragg pulses).Starting from the exact analytical phase shift formula obtained from the atom optics ABCD formalism, we use a power series expansion in time of the position of the atomic wave packet with respect to the initial condition. The result of this expansion leads to a formulation of the interferometer phase shift where the leading coefficient in the phase terms up to T^k dependences (k ≥ 0) in the time separation T between pulses, can be simply expressed in terms of a product between a Vandermonde matrix, and a vector characterizing the two-photon pulse sequence of the interferometer. This simple coefficient dependence of the phase shift reflects very well the atom interferometer’s sensitivity to a specific inertial field in the presence of multiple gravito-inertial effects. Consequently, we show that this formulation is well suited when looking for selective atomic sensors of accelerations, rotations or photon recoil only, which can beobtained by simply zeroing some specific coefficients. We give a theoritical application of our formulation to the photon recoil measurement.

Single-mode laser output in Yb3+-doped fluorophosphate fiber

Chao Wang, Zhiquan Lin, Liyan Zhang, and Danping Chen

Doc ID: 263657 Received 22 Apr 2016; Accepted 01 Jul 2016; Posted 08 Jul 2016  View: PDF

Abstract: A heterogeneous fiber with Yb3+-doped fluorophosphate core and phosphate cladding was fabricated by the rod-in-tube and stacking technique. The concentration of Yb3+ in core glass can be up to 6×1020 ions/cm3. The lasing threshold was 900 mW and the lasing wavelength was centered at 1043 nm. A single-mode laser output with a slope efficiency of 13.6% with respect to absorbed pump power was obtained, for the first time to knowledge. The beam quality factor (M2) was measured to be 1.25. Thus, FP glass fiber is a good alternative for gain medium in short-linear-cavity single-frequency fiber laser.

Generation of six-mode cluster states in a coupled cavity array

Gaoxiang Li, Sujuan Wei, Wenju Gu, and lihui Sun

Doc ID: 259345 Received 12 Feb 2016; Accepted 28 Jun 2016; Posted 28 Jun 2016  View: PDF

Abstract: We consider a chain of six coupled single-mode cavities, each containing an ensemble of four-level atoms, and demonstrate how to prepare stationary six-mode cluster states of the atomic ensembles. We show that a six-mode cluster state can be created in a single step by driving the ensembles with laser pulses of suitably chosen Rabi frequencies and phases. Introducing linear superpositions of the collective bosonic modes of the atomic ensembles, we show that the superposition modes can independently evolve to a desired stationary state with the help of the cavity damping. We illustrate this method by examining three examples of the creation of linear, Hexagon and double square cluster states.

Maximizing the hyperpolarizability of 1D potentials with multipleelectrons

Christopher Burke, Joseph Lesnefsky, Rolfe Petschek, and Timothy Atherton

Doc ID: 262669 Received 12 Apr 2016; Accepted 22 Jun 2016; Posted 23 Jun 2016  View: PDF

Abstract: We optimize the first and second intrinsic hyperpolarizabilities fora 1D piecewise linear potential dressed with Dirac delta functionsfor $N$ non-interacting electrons. The optimized values fall rapidlyfor $N>1$, but approach constant values of $\beta_{int}=0.40$, $\gamma_{int}^{+}=0.16$and $\gamma_{int}^{-}=-0.061$ above $N\gtrsim8$. These apparentbounds are achieved with only 2 parameters with more general potentialsachieving no better value. In contrast to previous studies, analysisof the hessian matrices of $\beta_{int}$ and $\gamma_{int}$ takenwith respect to these parameters shows that the eigenvectors are wellaligned with the basis vectors of the parameter space, indicatingthat the parametrization was well-chosen. The physical significanceof the important parameters is also discussed.

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