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Träfflista för sökning "L773:1094 4087 ;pers:(Margulis Walter)"

Sökning: L773:1094 4087 > Margulis Walter

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1.
  • Alcusa-Sáez, E. P., et al. (författare)
  • Acousto-optic interaction in polyimide coated optical fibers with flexural waves
  • 2017
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 25:15, s. 17167-17173
  • Tidskriftsartikel (refereegranskat)abstract
    • Acousto-optic coupling in polyimide-coated single-mode optical fibers using flexural elastic waves is demonstrated. The effect of the polyimide coating on the acousto-optic interaction process is analyzed in detailed. Theoretical and experimental results are in good agreement. Although the elastic attenuation is significant, we show that acousto-optic coupling can be produced with a reasonably good efficiency. To our knowledge, it is the first experimental demonstration of acousto-optic coupling in optical fibers with robust protective coating.
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2.
  • Brunetti, Anna Chiara, et al. (författare)
  • Raman probes based on optically-poled double-clad fiber and coupler
  • 2012
  • Ingår i: Optics Express. - 1094-4087. ; 20:27, s. 28563-28572
  • Tidskriftsartikel (refereegranskat)abstract
    • Two fiber Raman probes are presented, one based on an optically-poled double-clad fiber and the second based on an opticallypoled double-clad fiber coupler respectively. Optical poling of the core of the fiber allows for the generation of enough 532nm light to perform Raman spectroscopy of a sample of dimethyl sulfoxide (DMSO), when illuminating the waveguide with 1064nm laser light. The Raman signal is collected in the inner cladding, from which it is retrieved with either a bulk dichroic mirror or a double-clad fiber coupler. The coupler allows for a substantial reduction of the fiber spectral background signal conveyed to the spectrometer.
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3.
  • Camara, Alexandre R., et al. (författare)
  • Optical creation and erasure of the linear electrooptical effect in silica fiber
  • 2015
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 23:14, s. 18060-18069
  • Tidskriftsartikel (refereegranskat)abstract
    • We study the creation and erasure of the linear electrooptical effect in silicate fibers by optical poling. Carriers are released by exposure to green light and displaced with simultaneous application of an internal dc field. The second order nonlinear coefficient induced grows with poling bias. The field recorded (similar to 10(8) V/m) is comparable to that obtained through classical thermal poling of fibers. In the regime studied here, the second-order nonlinearity induced (similar to 0.06 pm/V) is limited by the field applied during poling (1.2 x 10(8) V/m). Optical erasure with high-power green light alone is very efficient. The dynamics of the writing and erasing process is discussed, and the two dimensional (2D) field distribution across the fiber is simulated. (C) 2015 Optical Society of America
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4.
  • Camara, Alexandre, et al. (författare)
  • Study of thermally poled fibers with a two-dimensional model
  • 2014
  • Ingår i: Optics Express. - 1094-4087. ; 22:15, s. 17700-17715
  • Tidskriftsartikel (refereegranskat)abstract
    • A two-dimensional (2D) numerical model is implemented to describe the movement of ions under thermal poling for the specific case of optical fibers. Three types of cations are considered (representing Na+, Li+ and H3O+) of different mobility values. A cross-sectional map of the carrier concentration is obtained as a function of time. The role of the various cations is investigated. The assumptions of the model are validated by comparing the predictions to experimental data of the time evolution of the nonlinearity induced. A variational analysis of poling parameters including temperature, poling voltage, sign of the bias potential and initial ionic concentrations is performed for a particular fiber geometry. The analysis allows identifying the impact of these parameters on the induced second-order nonlinearity in poled fibers.
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5.
  • Coronel, Edvin, et al. (författare)
  • Evaluation of Pearson correlation coefficient and Parisi parameter of replica symmetry breaking in a hybrid electronically addressable random fiber laser
  • 2021
  • Ingår i: Optics Express. - : The Optical Society. - 1094-4087. ; 29:15, s. 24422-24433
  • Tidskriftsartikel (refereegranskat)abstract
    • The hybrid electronically addressable random (HEAR) laser is a novel type of random fiber laser that presents the remarkable property of selection of the fiber section with lasing emission. Here we present a joint analysis of the correlations between intensity fluctuations at distinct wavelengths and replica symmetry breaking (RSB) behavior of the HEAR laser. We introduce a modified Pearson coefficient that simultaneously comprises both the Parisi overlap parameter and standard Pearson correlation coefficient. Our results highlight the contrast between the correlations and presence or not of RSB phenomenon in the spontaneous emission behavior well below threshold, replica-symmetric ASE regime slightly below threshold, and RSB phase with random lasing emission above threshold. In particular, in the latter we find that the onset of RSB behavior is accompanied by a stochastic dynamics of the lasing modes, leading to competition for gain intertwined with correlation and anti-correlation between modes in this complex photonic phase. 
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6.
  • Etcheverry, Sebastián, et al. (författare)
  • Fluidic trapping and optical detection of microparticles with a functional optical fiber
  • 2017
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 25:26, s. 33657-33663
  • Tidskriftsartikel (refereegranskat)abstract
    • A fiber probe is presented that traps single micro-sized particles and allows detection of their optical properties. The trapping mechanism used is based on fluid suction with a micro-structured optical fiber that has five holes along its cladding. Proof-of-principle experiments with a diluted solution of fluorescently labeled particles are performed. The fiber probe presented here may find various applications in life-science and environmental monitoring. ©
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7.
  • Lindberg, Robert, et al. (författare)
  • C-cavity fiber laser employing a chirped fiber Bragg grating for electrically gated wavelength tuning
  • 2020
  • Ingår i: Optics Express. - : OSA - The Optical Society. - 1094-4087. ; 28:7, s. 9208-9215
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a novel C-cavity concept for tunable lasers. The laser is based on a semiconductor optical amplifier (SOA), serving both as a gain medium as well as a modulator, and a chirped fiber Bragg grating (C-FBG) which acts as the end mirrors on both cavity ends. Driving the SOA with a pulse pair with variable delay enables wavelength tuning by targeting different regions in the C-FBG with the circulating pulse. The cavity design allows for wide tuning while maintaining a constant repetition rate, we show a tuning range of 35 nm -limited by the C-FBG's reflection bandwidth. Time-multiplexed operation with four different wavelengths is also demonstrated. Furthermore, the laser performance and dynamics under different operating conditions are analyzed and discussed.
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8.
  • Magalhaes, Regina, et al. (författare)
  • Fiber-based distributed bolometry
  • 2019
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 27:4, s. 4317-4328
  • Tidskriftsartikel (refereegranskat)abstract
    • Optical fibers are inherently designed to allow no interaction between the guided light and the surrounding optical radiation. Thus, very few optical fiber-based technologies exist in the field of optical radiation sensing. Accomplishing fully-distributed optical radiation sensing appears then as even more challenging since, on top of the lack of sensitivity explained above, we should add the need of addressing thousands of measurement points in a single, continuous optical cable. Nevertheless, it is clear that there exist a number of applications which could benefit from such a distributed sensing scheme, particularly if the sensitivity was sufficiently high to be able to measure correctly variations in optical radiation levels compatible with the earth surface. Distributed optical radiation sensing over large distances could be employed in applications such as Dynamic Line Rating (DLR), where it is known that solar radiation can be an important limiting factor in energy transmission through overhead power cables, and also in other applications such as thermo-solar energy. In this work, we present the proof-of-concept of the first distributed bolometer based on optical fiber technology and capable of detecting absolute changes of irradiance. The core idea of the system is the use of a special fiber coating with high emissivity (e.g., carbon coating or black paint). The high absorption of these coatings translates into a temperature change that can be read with sufficiently high sensitivity using phase-sensitive reflectometry. To demonstrate the concept, we interrogate distinct black-coated optical fibers using a chirped-pulse ÖOTDR, and we readily demonstrate the detection of light with resolutions in the order of 1% of the reference solar irradiance, offering a high-potential technology for integration in the aforementioned applications.
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9.
  • Malmström, Mikael, et al. (författare)
  • All-fiber cavity dumping
  • 2009
  • Ingår i: Optics Express. - 1094-4087. ; 17:20, s. 17596-17602
  • Tidskriftsartikel (refereegranskat)abstract
    • Cavity dumping of an all-fiber laser system is demonstrated. The active element is a pulse-picker with nanosecond rise time consisting of a microstructured fiber with electrically driven internal electrodes. The device is used for intracavity polarization rotation and dumping through a polarization splitter. The optical flux is removed from the cavity within one roundtrip and most of the amplified spontaneous emission, spiking and relaxation oscillation that follow during the gain recovery phase of the laser are blocked from the output signal.
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10.
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