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Articles 1 to 20 of 133 Next Page >>

April


Polymer optical microstructured fiber with birefringence induced by stress applying elements

  • Pawel Mergo, Tadeusz Martynkien, and Waclaw Urbanczyk
  • received 03/14/2014; accepted 04/17/2014; posted 04/17/2014; Doc. ID 208324
  • [full text: PDF (1854) KB)]
  • Abstract: We report on the fabrication of a birefringent microstructured PMMA fiber with polystyrene stress applying elements located in the solid part of the cladding. A microstructured part of the cladding composed of three rings of holes was made of We report on the fabrication of a birefringent microstructured PMMA fiber with polystyrene stress applying elements located in the solid part of the cladding. A microstructured part of the cladding composed of three rings of holes was made of a technical grade PMMA by a drilling method. The fiber shows relatively high birefringence of the order of 4x10-5, which weakly depends upon wavelength in the investigated spectral range from 0.6 to 1μm. The cross-talk between polarization modes is lower than 20 dB for a 1m long fiber, while the fiber loss is about 8dB/m at 0.83μm. We also studied the fiber response to temperature in the range from 20 to 60 °C. The temperature induced birefringence change is negative and shows significant hysteresis in the first cycle which gradually disappears in successive cycles. a technical grade PMMA by a drilling method. The fiber shows relatively high birefringence of the order of 4x10-5, which weakly depends upon wavelength in the investigated spectral range from 0.6 to 1μm. The cross-talk between polarization modes is lower than 20 dB for a 1m long fiber, while the fiber loss is about 8dB/m at 0.83μm. We also studied the fiber response to temperature in the range from 20 to 60 °C. The temperature induced birefringence change is negative and shows significant hysteresis in the first cycle which gradually disappears in successive cycles.

Keywords (OCIS):

  • (060.2270) Fiber optics and optical communications : Fiber characterization
  • (060.2280) Fiber optics and optical communications : Fiber design and fabrication
  • (060.2420) Fiber optics and optical communications : Fibers, polarization-maintaining
  • (060.5295) Fiber optics and optical communications : Photonic crystal fibers
  • (130.5460) Integrated optics : Polymer waveguides

Er/Tm:fiber laser system for coherent Raman microscopy

  • Giulio Cerullo, Marco Marangoni, Nicola Coluccelli, Gianluca Galzerano, Marco Cassinerio, and Vikas Kumar
  • received 03/03/2014; accepted 04/16/2014; posted 04/17/2014; Doc. ID 206899
  • [full text: PDF (1018) KB)]
  • Abstract: We present a novel architecture for a fiber-based hybrid laser system for coherent Raman microscopy, combining an amplified Er:fiber femtosecond oscillator with a Tm:fiber amplifier boosting the power of the 2-µm portion of a supercontinuum up to 300 mW. This is enough to obtain, by means of nonlinear spectral compression, sub-20-cm^-1 wide pump and Stokes pulses with 2500-3300 cm^-1 frequency detuning and average power at the 100-mW level. Application of this system to stimulated Raman scattering microscopy is discussed.

Keywords (OCIS):

  • (140.3510) Lasers and laser optics : Lasers, fiber
  • (190.5650) Nonlinear optics : Raman effect
  • (190.7110) Nonlinear optics : Ultrafast nonlinear optics
  • (320.5390) Ultrafast optics : Picosecond phenomena

Frequency-resolved optical gating with two nonlinear optical processes

  • Yuichiro Kida, Yuta Nakano, Kazuya Motoyoshi, and Totaro Imasaka
  • received 03/03/2014; accepted 04/16/2014; posted 04/17/2014; Doc. ID 207425
  • [full text: PDF (483) KB)]
  • Abstract: A frequency-resolved optical gating (FROG) technique that combines autocorrelation (second-harmonic-generation FROG, SHG-FROG) and cross-correlation FROG (XFROG) is reported for simultaneous characterization of two unknown optical pulses. Two SHG-FROG signals and a XFROG signal are acquired in a single measurement using a single diagnostic system. Unlike the conventional combination of SHG-FROG for reference-pulse characterization and XFROG for test-pulse characterization, the ambiguity in the direction of time in SHG-FROG is removed during phase retrieval by simultaneously analyzing the three FROG signals. Furthermore, over all characterization is faster, more robust, and highly convergent than the conventional combination of SHG-FROG and XFROG techniques.

Keywords (OCIS):

  • (320.7100) Ultrafast optics : Ultrafast measurements
  • (320.7160) Ultrafast optics : Ultrafast technology

High efficient 12W diode-pumped actively Q-switched Yb:KGd(WO4)2 laser

  • Alexander Rudenkov, Viktor Kisel, Anatoliy Pavlyuk, and Nikolai Kuleshov
  • received 03/14/2014; accepted 04/16/2014; posted 04/17/2014; Doc. ID 208227
  • [full text: PDF (1317) KB)]
  • Abstract: Compact diode-pumped actively Q-switched Yb:KGW laser is demonstrated with optical-to-optical efficiency of 50%. In a 3-mirror laser cavity configuration output power of 12.2 W with repetition rate up to 50 kHz and pulse duration of 10-24 ns was obtained. The maximum pulse peak power of 70 kW was achieved. The laser output beam profile was Gaussian up to maximum pump powers with M2 factor lower than 1.2.

Keywords (OCIS):

  • (140.3480) Lasers and laser optics : Lasers, diode-pumped
  • (140.3540) Lasers and laser optics : Lasers, Q-switched
  • (140.3615) Lasers and laser optics : Lasers, ytterbium

Diversity-Multiplexing Tradeoff in Mode-Division Multiplexing

  • Sercan Arik and Joseph Kahn
  • received 01/21/2014; accepted 04/16/2014; posted 04/16/2014; Doc. ID 205253
  • [full text: PDF (411) KB)]
  • Abstract: The capacity of mode-division multiplexing (MDM) systems is limited, for a given outage probability, by mode-dependent loss and gain. Modal degrees of freedom may be exploited to increase transmission rate (multiplexing gain) or lower outage probability (diversity gain), but there is a fundamental tradeoff between the achievable multiplexing and diversity gains. In this letter, we present the diversity-multiplexing tradeoff in MDM systems for the first time, studying the impact of signal-to-noise ratio, mode-dependent loss, and frequency diversity order on the tradeoff in the strong-mode-coupling regime.

Keywords (OCIS):

  • (060.0060) Fiber optics and optical communications : Fiber optics and optical communications
  • (060.1660) Fiber optics and optical communications : Coherent communications
  • (060.2330) Fiber optics and optical communications : Fiber optics communications
  • (060.2360) Fiber optics and optical communications : Fiber optics links and subsystems
  • (060.4080) Fiber optics and optical communications : Modulation
  • (060.4230) Fiber optics and optical communications : Multiplexing

Multi-mJ, kHz, 2.1-μm optical parametric chirped-pulse amplifier and high-flux soft X-ray high-harmonic generation

  • Kyung-Han Hong, FRANZ KAERTNER, Jeffrey Moses, Chien-Jen Lai, Luis Zapata, Peter Krogen, Jonathas Siqueira, Gregory Stein, and Chun-Lin Chang
  • received 03/13/2014; accepted 04/16/2014; posted 04/16/2014; Doc. ID 208176
  • [full text: PDF (569) KB)]
  • Abstract: We report on a multi-mJ 2.1-μm optical parametric chirped-pulse amplification (OPCPA) system operating at 1-kHz repetition rate, pumped by a picosecond cryogenic Yb:YAG laser, and the demonstration of soft X-ray high-harmonic generation (HHG) with a flux of ~2x10⁸ photon/s/1% bandwidth at 160 eV in Ar. The 1-kHz cryogenic Yb:YAG pump laser amplifies pulses up to 56 mJ and delivers compressed 42-mJ, 17- ps pulses to the 2.1-μm OPCPA system. In the 3-stage OPCPA chain, we have obtained up to 2.6 mJ of output energies at 2.1 μm and pulses compressed to 40 fs with good beam quality. Finally, we show cutoff extension of HHG driven by this 2.1 μm source in Ar and N₂ gas cells to 190 eV with high photon flux. Our 3-dimensional propagation simulation confirms the generation of soft X-ray attosecond pulses from the experiment with Ar.

Keywords (OCIS):

  • (190.4970) Nonlinear optics : Parametric oscillators and amplifiers
  • (320.7090) Ultrafast optics : Ultrafast lasers
  • (340.7480) X-ray optics : X-rays, soft x-rays, extreme ultraviolet (EUV)

Low-threshold optical bistabilities in ultra-thin plasmonic films

  • Lei Zhou, Shiwei Tang, baocheng Zhu, Shiyi Xiao, and Jung-Tsung Shen
  • received 03/26/2014; accepted 04/16/2014; posted 04/16/2014; Doc. ID 209003
  • [full text: PDF (1460) KB)]
  • Abstract: Optical bistability typically occurs only when the optical thickness in the device or the input light power is unfavorably large. Here we show that, for a class of plasmonic metamaterials consisting of ultra-thin holey metallic plates filled with nonlinear materials, the optical bistability can occur with an ultra-low excitation power. We present a realistic design working at 0.2 THz and perform full-wave simulations to quantitatively study its optical bistability properties. An analytical model is developed to explain the inherent physics and provides a general design guideline for future development.

Keywords (OCIS):

  • (190.0190) Nonlinear optics : Nonlinear optics
  • (310.0310) Thin films : Thin films
  • (160.3918) Materials : Metamaterials
  • (250.5403) Optoelectronics : Plasmonics

An ultra-broadband wide-angle unidirectional plasmonic coupler based on joint effects of plasmonic critical angles and subwavelength metallic gratings

  • Fan Lu, Feng Xiao, Kun Li, and Anshi Xu
  • received 01/08/2014; accepted 04/15/2014; posted 04/16/2014; Doc. ID 204400
  • [full text: PDF (2248) KB)]
  • Abstract: A unidirectional plasmonic couplers with ultra-broadband and wide-angle coupling efficiency is proposed and demonstrated. Employing the plasmonic critical angle (PCA) phenomenon in conjunction with the effect of subwavelength metallic gratings, a wide incident angular full-width-half-maximum (AFWHM >28 degree), coupling efficiency larger than 50 % and extinction ratio better than 15 dB over an ultra-broad wavelength range 725-985 nm (bandwidth>260 nm) are achieved. The operation principle and performance of the structure are clarified and theoretically illustrated.

Keywords (OCIS):

  • (130.3120) Integrated optics : Integrated optics devices
  • (250.5403) Optoelectronics : Plasmonics
  • (310.6628) Thin films : Subwavelength structures, nanostructures

Enhanced photovoltaic performance of organic/silicon nanowire hybrid solar cells by solution-evacuated

  • yong zhang, Wei li Wang, Xian Shao Zou, Bin Zhang, Jun Dong, Qiao Li Niu, and Yi An Yin
  • received 03/19/2014; accepted 04/15/2014; posted 04/16/2014; Doc. ID 208554
  • [full text: PDF (997) KB)]
  • Abstract: A novel method has been developed to fabricate organic-inorganic hybrid heterojunction solar cells based on n-type silicon nanowire and poly (3,4-ethylenedioxythiophene):poly (styrenesulfonate) (PEDOT:PSS) hybrid structures by evacuating the PEDOT:PSS solution with dip-dropping on the top of silicon nanowires before spin-coating (solution-evacuated). The coverage and contact interface between PEDOT:PSS and silicon nanowire arrays can be dramatically enhanced by optimizing solution-evacuated time. The maximum power conversion efficiency (PCE) reaches 9.22 % for a solution-evacuated time of 2 min compared with 5.17 % for the untreated pristine device. The improvement photovoltaic performance is mainly attributed into better organic coverage and contact with n-type silicon nanowire surface.

Keywords (OCIS):

  • (160.5470) Materials : Polymers
  • (230.4000) Optical devices : Microstructure fabrication
  • (350.6050) Other areas of optics : Solar energy

Sub-MHz ultrahigh resolution optical spectrometry based on Brillouin dynamic gratings

  • Yong Kang Dong, Taofei Jiang, Lei Teng, Hongying Zhang, Liang Chen, Xiaoyi Bao, and Zhiwei Lu
  • received 03/19/2014; accepted 04/15/2014; posted 04/16/2014; Doc. ID 208572
  • [full text: PDF (460) KB)]
  • Abstract: We propose and demonstrate an ultrahigh resolution optical spectrometry based on Brillouin dynamic gratings (BDGs). Taking advantage of creating a long grating in an optical fiber, an ultra-narrow bandwidth optical filter is realized by operating a BDG in a long single-mode fiber (SMF), and the optical spectrometry is performed by sweeping the center wavelength of the BDG-based filter through swept-tuned laser. The BDG-based optical spectrometry features ultrahigh resolution, simple direction detection and a large wavelength coverage. In the experiment, a 4-fm (0.5 MHz) spectral resolution is achieved by operating a BDG in a 400-m SMF, and the wavelength coverage can be readily extended to C+L bands with a commercial tunable laser.

Keywords (OCIS):

  • (120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
  • (190.4370) Nonlinear optics : Nonlinear optics, fibers
  • (290.5900) Scattering : Scattering, stimulated Brillouin

Coherent supercontinuum generation using Er-doped fiber laser of hybrid mode-locking

  • Seung-Woo Kim, Seungman Kim, Jiyong Park, Seongheum Han, and Young-Jin Kim
  • received 03/25/2014; accepted 04/15/2014; posted 04/16/2014; Doc. ID 208888
  • [full text: PDF (531) KB)]
  • Abstract: Supercontinuum generation is performed using femtosecond laser pulses produced by combining two distinct mode-locking mechanisms of nonlinear polarization evolution (NPE) with saturable absorption (SA) on an Er-doped fiber oscillator. The generated supercontinuum yields a high level of spectral visibility of 93 %, without the presence of spontaneous emission of post-amplification, being well suited for precision spectroscopy, broad-band interferometry and coherent telecommunications.

Keywords (OCIS):

  • (190.4370) Nonlinear optics : Nonlinear optics, fibers
  • (320.2250) Ultrafast optics : Femtosecond phenomena
  • (320.7090) Ultrafast optics : Ultrafast lasers
  • (320.6629) Ultrafast optics : Supercontinuum generation

Ultraviolet-to-visible down-conversion luminescence of Eu3+ ions in sol-gel silica containing GdF3 nanocrystals

  • Barbara Szpikowska-Sroka, Lidia Zur, Rozalia Czoik, Tomasz Goryczka, Maria Zadlo, and Wojciech Pisarski
  • received 02/07/2014; accepted 04/15/2014; posted 04/16/2014; Doc. ID 206106
  • [full text: PDF (2112) KB)]
  • Abstract: GdF3 nanocrystals doped with Eu3+ ions with high emission efficiency were prepared by sol-gel method. The structural properties were examined by XRD measurements. The effects of gadolinium co-doping on europium emission in the prepared sol-gel glasses have been studied. The registered emission bands correspond to 5Do→7FJ (J=0-4) transitions of Eu3+. The electric dipole 5Do →7F2 transitions were dominant in the samples before heat treatment, whereas magnetic dipole 5Do → 7F1 transitions had a higher probability in the samples after annealing. The luminescence lifetime for the 5Do level of Eu3+ ions in the samples after excitation at 273 nm is long-lived in comparison to excitation at 393 nm and increased to 190%. Energy transfer from Gd3+ to Eu3+ was observed.

Keywords (OCIS):

  • (160.4670) Materials : Optical materials
  • (160.4760) Materials : Optical properties
  • (160.6060) Materials : Solgel
  • (260.2160) Physical optics : Energy transfer
  • (160.4236) Materials : Nanomaterials

Plasmonic bandpass filters with cascaded rectangular ring resonators

  • Chyong-HUa Chen
  • received 02/26/2014; accepted 04/15/2014; posted 04/16/2014; Doc. ID 207147
  • [full text: PDF (799) KB)]
  • Abstract: We theoretically present the analysis and the design of the nanoplasmonic bandpass filter with a flat-top spectral characteristics by cascading a series of directly-connected rectangular ring resonators based on metal-insulator-metal waveguides. Analyzed by the equivalent lumped circuit model of the transmission line to plasmonic waveguides, the transmission properties of a symmetric rectangular ring resonator with the direct-connected input and output waveguides is approximately the same as that of a Fabry-Perot resonator. Then, the thin-film design methodology is applied to realize a plasmonic bandpass filter with the squared passband, and an example of cascaded two-rectangular ring resonator structure is numerically demonstrated by using both the transmission line model and two-dimensional finite difference time domain method.

Keywords (OCIS):

  • (130.3120) Integrated optics : Integrated optics devices
  • (230.7370) Optical devices : Waveguides
  • (240.6680) Optics at surfaces : Surface plasmons
  • (310.4165) Thin films : Multilayer design
  • (130.7408) Integrated optics : Wavelength filtering devices

High Power Red, Orange, and Green Pr3+:LiYF4 Lasers

  • Philip Metz, Fabian Reichert, Francesca Moglia, Sebastian Müller, Daniel-Timo Marzahl, Christian Kraenkel, and Guenter Huber
  • received 02/26/2014; accepted 04/15/2014; posted 04/16/2014; Doc. ID 207192
  • [full text: PDF (790) KB)]
  • Abstract: Laser experiments with Pr3+:LiYF4 under excitation with a frequency doubled optically pumped semiconductor laser emitting 5 W at 479 nm were performed at seven different laser wavelengths of 523 nm, 546 nm, 604 nm, 607 nm, 640 nm, 698 nm, and 720 nm. At all these wavelengths the output power exceeded 1 W. The best performance at 523 nm with an output power of 2.9 W at a slope efficiency of 72% and an optical-to-optical efficiency of 67% with respect to the incident pump power represents the highest efficiency ever reported for a praseodymium doped laser material.

Keywords (OCIS):

  • (140.3380) Lasers and laser optics : Laser materials
  • (140.3460) Lasers and laser optics : Lasers
  • (140.3580) Lasers and laser optics : Lasers, solid-state

Influence of pollutants in the magneto-dielectric response of silicon nanoparticles

  • Juan Sanz, Rodrigo Alcaraz de la Osa, Angela Barreda, Jose Saiz, Francisco Gonzalez, and Fernando Moreno
  • received 02/27/2014; accepted 04/15/2014; posted 04/16/2014; Doc. ID 207263
  • [full text: PDF (6160) KB)]
  • Abstract: The influence of the degree of purity of a silicon nanoparticle on its resonances, either electric or magnetic, is assessed by using Mie theory as well as finite-element simulations. In particular, it is shown that the main effect of the increase of absorption due to the pollutants is observed in the magnetic resonances. Concerning Kerker's conditions for the directionality of the scattering, it is found that both are strongly shifted when the material's purity is varied. Resistive losses confirm the quenching of magnetic resonances, showing that the region of influence in the magnetic dipole resonance is much larger than in the electric one, although it has been found that losses are not critical for silicon content over 99.50 %.

Keywords (OCIS):

  • (290.1350) Scattering : Backscattering
  • (290.4020) Scattering : Mie theory
  • (290.5850) Scattering : Scattering, particles
  • (290.2558) Scattering : Forward scattering

PT-symmetric coupler with a coupling defect: soliton interaction with exceptional point

  • Chao Hang, Yuliy Bludov, Guoxiang Huang, and Vladimir Konotop
  • received 03/05/2014; accepted 04/15/2014; posted 04/16/2014; Doc. ID 207401
  • [full text: PDF (1522) KB)]
  • Abstract: We study interaction of a soliton in a parity-time ($\PT$) symmetric coupler consisting of two arrays, which has local perturbation of the coupling constant. Such a coupling defect does not change the $\PT$-symmetry of the system, but locally can achieve the exceptional point. We have found that the symmetric solitons after interaction with the defect either transform into breathers of blow up. The dynamics of anti-symmetric solitons is more complex, showing domains of successive broadening of the beam and of the beam splitting in two outwards propagating solitons, in addition to the single breather generation and blow up. All the effects are preserved when the coupling strength in the center of the defect deviates from the exceptional point. If however the coupling is strong enough the only observable outcome of the soliton-defect interaction is the generation of the breather.

Keywords (OCIS):

  • (190.5940) Nonlinear optics : Self-action effects
  • (190.6135) Nonlinear optics : Spatial solitons

High power and highly efficient amplification of radially polarized beam using Yb doped double-clad fiber

  • Yuichi Kozawa, Shunichi Sato, and Shinya Kanazawa
  • received 03/06/2014; accepted 04/14/2014; posted 04/14/2014; Doc. ID 207796
  • [full text: PDF (701) KB)]
  • Abstract: We demonstrated the amplification of a radially polarized beam by using an Yb doped double clad fiber. The output power of the amplified beam reached 21 W at the pump power of 30 W. The generation of amplified spontaneous emission was suppressed by applying a seed beam with sufficient power. The intensity and polarization distributions of the seed beam were well maintained after the amplification.

Keywords (OCIS):

  • (060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
  • (140.4480) Lasers and laser optics : Optical amplifiers
  • (260.5430) Physical optics : Polarization

Continuous-wave, double-pass second-harmonic generation with 60 % efficiency in a single MgO:PPSLT

  • Matthias Stappel, Jochen Walz, and Daniel Kolbe
  • received 02/12/2014; accepted 04/14/2014; posted 04/17/2014; Doc. ID 206301
  • [full text: PDF (330) KB)]
  • Abstract: We present a double-pass scheme for high efficiency, high power, second-harmonic generation in a single MgO:PPSLT. The device is pumped by a single-frequency, continuous-wave fiber amplifier at a wavelength of 1091 nm. For the double-pass scheme a conversion efficiency of 60 % and a harmonic power of 12.8 W at a wavelength of 545.5 nm with high beam quality (M²<1.2) is achieved. Compared to single-pass second-harmonic generation a double-pass enhancement factor of more than 2 is observed at the highest fundamental pump power.

Keywords (OCIS):

  • (140.7300) Lasers and laser optics : Visible lasers
  • (190.4360) Nonlinear optics : Nonlinear optics, devices
  • (140.3515) Lasers and laser optics : Lasers, frequency doubled

Flexible ultra-flat optical frequency comb generator using a single-driven dual-parallel Mach-Zehnder modulator

  • Qiang Wang, Li Huo, Yanfei Xing, and Bingkun Zhou
  • received 01/30/2014; accepted 04/14/2014; posted 04/14/2014; Doc. ID 205782
  • [full text: PDF (1562) KB)]
  • Abstract: We propose and experimentally demonstrate a simple and cost-effective ultra-flat optical frequency comb (OFC) generator by directly modulating a standalone dual-parallel Mach-Zehnder modulator (DP-MZM) with only one radio frequency (RF) signal without any other assistant devices. 5- and 7-tone OFC with exactly the same intensity can be theoretically generated using two sets of parameters obtained by solving equations derived from the DP-MZM modulation model. In good agreement with the theoretical results, 5- and 7-tone OFC with flatness within 0.1 dB and 1 dB are experimentally demonstrated, respectively.

Keywords (OCIS):

  • (060.4080) Fiber optics and optical communications : Modulation
  • (060.5625) Fiber optics and optical communications : Radio frequency photonics

Optical dipole mirror for cold atoms based on a metallic diffraction grating

  • Tomasz Kawalec, Dobroslawa Bartoszek-Bober, Roman Panas, Jacek Fiutowski, Aleksandra Plawecka, and Horst-Günter Rubahn
  • received 02/14/2014; accepted 04/14/2014; posted 04/14/2014; Doc. ID 206380
  • [full text: PDF (1492) KB)]
  • Abstract: We report on the realization of a plasmonic dipole mirror for cold atoms based on a metallic grating coupler. A cloud of atoms is reflected by the repulsive potential generated by surface plasmon polaritons excited on a reflection gold grating by a 780 nm laser beam. Experimentally and numerically determined mirror efficiencies are close to 100 %. The intensity of SPPs above a real grating coupler and the atomic trajectories as well as the momentum dispersion of the atom cloud being reflected are computed. A suggestion is given on how the plasmonic mirror might serve as an optical atom chip.

Keywords (OCIS):

  • (140.3320) Lasers and laser optics : Laser cooling
  • (230.1950) Optical devices : Diffraction gratings
  • (230.4000) Optical devices : Microstructure fabrication
  • (240.6680) Optics at surfaces : Surface plasmons

Articles 1 to 20 of 133 Next Page >>





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