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Articles 1 to 20 of 126 Next Page >>

January


Ultrastable fiber amplifier delivering 145 fs pulses with 6 μJ energy at 10 MHz repetition rate

  • Marcel Wunram, Patrick Storz, Daniele Brida, and Alfred Leitenstorfer
  • received 12/09/2014; accepted 01/22/2015; posted 01/23/2015; Doc. ID 229404
  • [full text: PDF (593) KB)]
  • Abstract: A high-power femtosecond Yb:fiber amplifier operating with exceptional noise performance and long-term stability is demonstrated. It generates a 10 MHz train of 145 fs pulses at 1.03 μm with peak powers above 36 MW. The system features a relative amplitude noise of 2.6·10^-8 Hz^-1/2 at 1 MHz and drifts of the 60 W average power below 0.3% over 72 hours of continuous operation. The passively phase-stable Er:fiber seed system provides ultrabroadband pulses that are synchronized at a repetition rate of 40 MHz. This combination aims at new schemes for sensitive experiments in ultrafast scientific applications.

Keywords (OCIS):

  • (060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
  • (140.3280) Lasers and laser optics : Laser amplifiers
  • (140.7090) Lasers and laser optics : Ultrafast lasers

Internal gain in Er-doped As2S3 chalcogenide planar waveguides

  • Kunlun Yan, Khu Vu, and Stephen Madden
  • received 12/15/2014; accepted 01/22/2015; posted 01/23/2015; Doc. ID 230680
  • [full text: PDF (690) KB)]
  • Abstract: Low loss Erbium doped As2S3 planar waveguides are fabricated by cothermal evaporation and plasma etching. Internal gain in the telecommunications band is demonstrated for the first time in any chalcogenide glass, and additionally in a thin film planar waveguide amplifier configuration.

Keywords (OCIS):

  • (130.3060) Integrated optics : Infrared
  • (140.5680) Lasers and laser optics : Rare earth and transition metal solid-state lasers
  • (230.4480) Optical devices : Optical amplifiers

Observation of a classical cheshire cat in an optical interferometer

  • Jonathan Weinstein, Andrew Geraci, David Atherton, and Gambhir Ranjit
  • received 10/08/2014; accepted 01/21/2015; posted 01/23/2015; Doc. ID 224389
  • [full text: PDF (775) KB)]
  • Abstract: A recent neutron interferometry experiment claims to demonstrate a paradoxical phenomena dubbed the “quantum Cheshire Cat”. We have reproduced and extended these results with an equivalent optical interferometer. The results suggest that the photon travels through one arm of the interferometer, while its polarization travels through the other. However, we show that these experimental results belong to the domain where quantum and classical wave theories coincide; there is nothing uniquely quantum about the illusion of this cheshire cat.

Keywords (OCIS):

  • (000.1600) General : Classical and quantum physics
  • (120.3180) Instrumentation, measurement, and metrology : Interferometry
  • (270.0270) Quantum optics : Quantum optics

6.5 W ZnGeP₂OPO directly pumped by a Q-switched Tm3+-doped single-oscillator fiber laser

  • Christelle Kieleck, Antoine Berrou, Brenda Donelan, Benoit Cadier, thierry Robin, and Marc Eichhorn
  • received 11/05/2014; accepted 01/21/2015; posted 01/23/2015; Doc. ID 225550
  • [full text: PDF (852) KB)]
  • Abstract: An efficient actively Q-switched Tm3+-doped single-oscillator fiber laser based on a silica polarization- maintaining (PM) double-clad fiber provided average powers of 23 W at pulse widths of 65 ns at 40 kHz pulse repetition frequency. It was used to directly pump a ZnGeP₂ OPO. Up to 6.5 W were generated in mid-IR wavelength range.

Keywords (OCIS):

  • (140.0140) Lasers and laser optics : Lasers and laser optics
  • (140.3460) Lasers and laser optics : Lasers
  • (140.3510) Lasers and laser optics : Lasers, fiber
  • (140.3540) Lasers and laser optics : Lasers, Q-switched
  • (190.4970) Nonlinear optics : Parametric oscillators and amplifiers

Continuous-wave whispering-gallery optical parametric oscillator for high-resolution spectroscopy

  • Christoph Werner, Ingo Breunig, and Karsten Buse
  • received 12/04/2014; accepted 01/21/2015; posted 01/21/2015; Doc. ID 229013
  • [full text: PDF (334) KB)]
  • Abstract: We achieve a continuous operation of a whispering gallery optical parametric oscillator by stabilizing the resonator temperature T on the mK level and simultaneously locking the pump frequency to a cavity resonance using the Pound-Drever-Hall technique. The millimeter-sized device converts several mW of a pump wave at 1040 nm wavelength to signal and idler waves around 2000 nm wavelength with more than 50 % efficiency. Over one hour, power and frequency of the signal wave vary by < ±1 % and by < ±25 MHz, respectively. The latter can be tuned over 480 MHz without a mode hop by changing T over 120 mK. In order to prove the suitability for high-resolution spectroscopy, we scan the signal frequency across the resonance of a Fabry-Pérot interferometer resolving nicely its 10 MHz linewidth.

Keywords (OCIS):

  • (190.0190) Nonlinear optics : Nonlinear optics
  • (190.4970) Nonlinear optics : Parametric oscillators and amplifiers
  • (230.5750) Optical devices : Resonators

Photonic spin Hall effect in dielectric metasurfaces with rotational symmetry breaking

  • Hailu Luo, Yachao Liu, Xiaohui Ling, Xunong Yi, Xinxing Zhou, Shizhen Chen, Yougang Ke, and Shuangchun Wen
  • received 12/10/2014; accepted 01/20/2015; posted 01/21/2015; Doc. ID 229472
  • [full text: PDF (1939) KB)]
  • Abstract: Observation of photonic spin Hall effect in dielectric metasurfaces with rotational symmetry breaking is presented. We show that no spin-dependent splitting occurred when keeping the rotational symmetry of metasurfaces. However, the splitting can be observed when the rotational symmetry is broken. It is find that the spin-dependent splitting is a unique angular splitting in real position space, and is attributed to the space-variant Pancharatnam-Berry phase, which can be enhanced by increasing the rotation rate of the metasurfaces. Therefore, the dielectric metasurfaces provide a great flexibility in the manipulation of photonic SHE.

Keywords (OCIS):

  • (260.5430) Physical optics : Polarization
  • (160.3918) Materials : Metamaterials
  • (310.6628) Thin films : Subwavelength structures, nanostructures

All-fiber mode-locked laser based on microfiber polarizer

  • Zhongmin Yang, Jiulin Gan, Tong Yang, Yuqing Wu, Qingyu Li, Shanhui Xu, and Zhishen Zhang
  • received 11/17/2014; accepted 01/20/2015; posted 01/21/2015; Doc. ID 226632
  • [full text: PDF (893) KB)]
  • Abstract: A novel all-fiber mode-locked fiber laser based on microfiber polarizer is proposed and demonstrated. The microfiber polarizer is composed of two pieces of microfibers that are finely manipulated to partly overlapped. Due to the asymmetric cross section, the microfiber polarizer shows a strong birefringence that ultimately induces high polarization-selective feature. Compared with other polarizers, the microfiber polarizer owns the merits of simpler fabrication, lower cost, broader band and compacter size. The working wavelength of the microfiber polarizer can be adjusted according to the needs of the actual application. The polarization extinction ratio of the microfiber polarizer is 26dB, stable pulse with the duration of 1ps is generated from this microfiber polarizer based all-fiber mode-locked laser.

Keywords (OCIS):

  • (140.3510) Lasers and laser optics : Lasers, fiber
  • (140.4050) Lasers and laser optics : Mode-locked lasers
  • (230.3990) Optical devices : Micro-optical devices
  • (240.5440) Optics at surfaces : Polarization-selective devices

Anisotropy analysis of third-harmonic generation in a germanium-doped silica optical fiber

  • Benoit Boulanger, Adrien Borne, Tomotaka Katsura, Corinne Felix, Benjamin Doppagne, Patricia Segonds, Kamel Bencheikh, and J. Ariel Levenson
  • received 10/10/2014; accepted 01/20/2015; posted 01/21/2015; Doc. ID 224337
  • [full text: PDF (1661) KB)]
  • Abstract: We performed an intermodal third-harmonic generation around 515 nm in a germanium-doped silica optical fiber. The analysis of the complex polarization behavior that was observed allowed us to determine the orientation symmetry group of the fiber and the relative values of the independent coecients of the third-order electric susceptibility tensor.

Keywords (OCIS):

  • (190.4370) Nonlinear optics : Nonlinear optics, fibers
  • (190.4400) Nonlinear optics : Nonlinear optics, materials
  • (190.7220) Nonlinear optics : Upconversion

Quantitative Study on Propagation and Healing of Airy Beams Under Experimental Conditions

  • Zhimin Shi, Ziyi Zhu, fei zhuang, and Jessica Margiewicz
  • received 10/08/2014; accepted 01/20/2015; posted 01/21/2015; Doc. ID 224547
  • [full text: PDF (995) KB)]
  • Abstract: We investigate the propagation and healing of one-dimensional Airy beams that are obtainable under practical experimental conditions. We introduce an intensity similarity factor to quantitatively describe how an Airy beam retains its original shape. Based on such a figure of merit, we define a shape-retaining distance to quantify how far an Airy beam can keep the shape of its main lobe upon propagation and a healing distance to quantify how soon an initially-partially-blocked Airy beam can restore its main lobe profile. We perform an analysis on how these two distances scale with experimental parameters. We further use an interference picture to interpret the healing phenomenon of an Airy beam. Our study can serve as a guideline for quantitative performance analysis for applications of Airy beams, and can be extended to 2D Airy beams and other special beams in a straightforward fashion.

Keywords (OCIS):

  • (050.1940) Diffraction and gratings : Diffraction
  • (350.5500) Other areas of optics : Propagation
  • (070.7345) Fourier optics and signal processing : Wave propagation

Generation of broadband noise-like pulse from Yb-doped fiber laser ring cavity

  • Masayuki Suzuki, Rashid Ganeev, Shin Yoneya, and H. Prof. H. Kuroda
  • received 12/17/2014; accepted 01/20/2015; posted 01/21/2015; Doc. ID 230832
  • [full text: PDF (336) KB)]
  • Abstract: We have demonstrated a generation of the noise-like pulse (NLP) with broadband spectrum in a nonlinear polarized evolution-based passive mode-locked Yb-doped fiber (YDF) ring laser. At the cavity dispersion of near zero, the NLP with spectrum bandwidth up to 131 nm (FWHM) was obtained at a central wavelength of 1070 nm with output power of 136 mW and 80 MHz repetition rate. To our best knowledge, this spectrum bandwidth of NLP is the broadest among the reported YDF lasers. The autocorrelation function of pulse contained the short (30 fs) and long (4.6 ps) components. This short coherence light source is well-suited for the optical coherent tomography used for ophthalmology at a wavelength of ~1000 nm.

Keywords (OCIS):

  • (140.3510) Lasers and laser optics : Lasers, fiber
  • (140.3615) Lasers and laser optics : Lasers, ytterbium

Sub-pm linewidth nanosecond Nd:GYSGG laser at 1336.6 nm

  • Hui Li, zhimin wang, Fengfeng Zhang, Mingqiang Wang, Jiajia Li, Yulin Mao, Lei Yuan, Nan Zong, Shenjin Zhang, Feng Yang, Yong Bo, Chunqing GAO, Da Cui, Qinjun Peng, and Xu Zuyan
  • received 12/05/2014; accepted 01/20/2015; posted 01/21/2015; Doc. ID 229007
  • [full text: PDF (598) KB)]
  • Abstract: We demonstrate a narrow linewidth acousto-optic (AO) Q-switched nanosecond Nd:GYSGG ring laser at 1336.6 nm side-pumped by 808 nm quasi continuous wave (QCW) diode lasers for the first time. With incident pump power of 42.3 W, a maximum average output power of 367 mW at 1336.6 nm with linewidth less than 0.85 pm and a pulse width of 300 ns was obtained at a repetition rate of 80 Hz, corresponding to a peak power of 15.3 kW. It can be tuned from 1336.576 nm to 1336.652nm with tuning resolution of 1 pm. The 1336.632 nm line can be converted to deep ultraviolet (DUV) 167.079 nm laser through its eighth harmonics, which is useful for the 27Al+ optical frequency standard.

Keywords (OCIS):

  • (140.3540) Lasers and laser optics : Lasers, Q-switched
  • (140.3560) Lasers and laser optics : Lasers, ring
  • (140.3580) Lasers and laser optics : Lasers, solid-state
  • (140.3600) Lasers and laser optics : Lasers, tunable
  • (140.3538) Lasers and laser optics : Lasers, pulsed

Balancing of thermal lenses in enhancement cavities with transmissive elements

  • Nikolai Lilienfein, Henning Carstens, Simon Holzberger, Christoph Jocher, Tino Eidam, Jens Limpert, Andreas Tünnermann, Alexander Apolonskiy, Ferenc Krausz, and Ioachim Pupeza
  • received 12/05/2014; accepted 01/19/2015; posted 01/22/2015; Doc. ID 229074
  • [full text: PDF (1348) KB)]
  • Abstract: Thermal lensing poses a serious challenge for the power scaling of enhancement cavities, in particular when these contain transmissive elements. We demonstrate the compensation of the lensing induced by thermal deformations of the cavity mirrors with the thermal lensing in a thin Brewster plate. Using forced convection to fine-tune the lensing in the plate, we achieve average powers of up to 160 kW for 250-MHz-repetition-rate picosecond pulses with a power-independent mode size. Furthermore, we show that the susceptibility of the cavity mode size to thermal lensing allows highly sensitive absorption measurements.

Keywords (OCIS):

  • (140.7240) Lasers and laser optics : UV, EUV, and X-ray lasers
  • (230.5750) Optical devices : Resonators

Probing the topological charge of a vortex beam with dynamic angular double slits

  • Pei Zhang, Dong-Zhi Fu, Dongxu Chen, Rui-feng Liu, Hong Gao, fuli li, and Yunlong Wang
  • received 12/12/2014; accepted 01/19/2015; posted 01/22/2015; Doc. ID 229399
  • [full text: PDF (564) KB)]
  • Abstract: When a vortex beam with the spiral phase structure passes through a dynamic angular double slits (ADS), the interference pattern changes alternatively between destructive and constructive at the angular bisector direction of the (ADS) due to their phase difference. Based on this property, we experimentally demonstrate a simple method, which can precisely and efficiently determine the topological charge of vortex beams. What’s more, this scheme allows determining both the modulus and sign of the topological charge of vortex beams simultaneously.

Keywords (OCIS):

  • (120.3180) Instrumentation, measurement, and metrology : Interferometry
  • (140.3295) Lasers and laser optics : Laser beam characterization
  • (050.4865) Diffraction and gratings : Optical vortices

Estimation of particle size variations for laser speckle rheology of materials

  • Zeinab Hajjarian and Seemantini Nadkarni
  • received 12/18/2014; accepted 01/19/2015; posted 01/21/2015; Doc. ID 231092
  • [full text: PDF (2611) KB)]
  • Abstract: Laser Speckle Rheology (LSR) is an optical technique for assessing the viscoelastic properties of materials with several industrial, biological, and medical applications. In LSR, the viscoelastic modulus, G*(ω), of a material is quantified by analyzing the temporal fluctuations of speckle patterns. However, the size of scattering particles within the material also influences the rate of speckle fluctuations, independent of sample mechanical properties, and complicates the accurate estimation of G*(ω). Here, we demonstrate that the average particle size may be retrieved from the azimuth-angle dependence of time-averaged speckle intensities, permitting the accurate quantification of the viscoelastic moduli of materials with unknown particle size distribution using LSR.

Keywords (OCIS):

  • (110.6150) Imaging systems : Speckle imaging
  • (170.3880) Medical optics and biotechnology : Medical and biological imaging
  • (290.4020) Scattering : Mie theory
  • (290.5850) Scattering : Scattering, particles
  • (290.5855) Scattering : Scattering, polarization

Experimental analysis of distributed pump absorption and refractive index changes in Yb-doped fibers using acousto-optic interaction

  • Antonio Diez, Erica Alcusa-Sáez, and Miguel Andrés
  • received 10/10/2014; accepted 01/19/2015; posted 01/21/2015; Doc. ID 224690
  • [full text: PDF (634) KB)]
  • Abstract: In fiber acousto-optic interaction is used to characterize the refractive index changes at the C band in a single-mode ytterbium-doped optical fiber under 980 nm pumping. The transmission notch created by the acoustic-induced coupling between the core mode and a cladding mode shifts to longer wavelengths when the pump is delivered to the fiber. The electronic contribution to the refractive index change is quantified from the wavelength shift. Using a time-resolved acousto-optic method, we investigate the distribution of pump absorption, and the resulting refractive index change profile, along sections of ytterbium-doped fiber exceeding 1 m long under different pump power levels.

Keywords (OCIS):

  • (060.2270) Fiber optics and optical communications : Fiber characterization
  • (230.1040) Optical devices : Acousto-optical devices
  • (060.3510) Fiber optics and optical communications : Lasers, fiber

Photonic Crystal Enhanced Fluorescence through Extraction of Dual Polarization Modes

  • Cheng-Sheng Huang, Yu-An Wu, and Po-Tsung Wu
  • received 11/19/2014; accepted 01/19/2015; posted 01/21/2015; Doc. ID 227114
  • [full text: PDF (773) KB)]
  • Abstract: In this letter, we demonstrate that fluorescence detection by using surface-bound fluorescent molecules can be enhanced by coupling fluorescence emission into dual polarized resonant modes of a photonic crystal (PC) substrate. The PC was fabricated through nanoreplica molding by using a plastic substrate and was designed such that the transverse magnetic (TM)- and transverse electric (TE)-polarized resonance coincided at a specific combination of the incident angle and illumination wavelength. During excitation, the nonpolarized emission from cyanine-5 was simultaneously coupled into TE and TM resonant modes and reradiated into the detection instrument, increasing the fluorescence collection efficiency and, thus, enhancing fluorescence detection.

Keywords (OCIS):

  • (170.2520) Medical optics and biotechnology : Fluorescence microscopy
  • (050.5298) Diffraction and gratings : Photonic crystals
  • (230.5298) Optical devices : Photonic crystals
  • (050.6624) Diffraction and gratings : Subwavelength structures

Long-range surface plasmon resonance sensor based on dielectric/silver coated hollow fiber with enhanced figure of merit

  • Xiao-Song ZHU, Binghong Liu, Yongxiang Jiang, Xiaoli Tang, and Yi-Wei Shi
  • received 10/22/2014; accepted 01/18/2015; posted 01/21/2015; Doc. ID 225373
  • [full text: PDF (773) KB)]
  • Abstract: A long-range surface plasmon resonance (LRSPR) sensor based on dielectric/silver coated hollow fiber (HF) is proposed. It can detect the refractive index (RI) of sensed liquid filled in the hollow core of the sensor. A HF LRSPR sensor with 90nm thick silver layer and 260nm thick OC300 layer is fabricated. Experiments are taken to evaluate the performance of the sensor by measuring the transmission spectra. Theoretical analysis based on a ray model is also taken and the results agree well with the experimental results. The proposed sensor has similar sensitivity but much smaller SPR dip width than the silver coated HF SPR sensor. Thus figure of merit of the sensor are enhanced approximately five times. The stability of the sensor is also improved because the dielectric layer acts as a protection layer for the damageable silver layer.

Keywords (OCIS):

  • (060.2280) Fiber optics and optical communications : Fiber design and fabrication
  • (060.2370) Fiber optics and optical communications : Fiber optics sensors
  • (240.6680) Optics at surfaces : Surface plasmons

Thermal stress modification in regenerated fiber Bragg grating via manipulation of glass transition temperature based on CO2 laser annealing

  • Kok-Sing Lim, Man-Hong Lai, Dinusha Gunawardena, Harith Ahmad, Wu Yi Chong, and Hang-Zhou Yang
  • received 11/06/2014; accepted 01/18/2015; posted 01/21/2015; Doc. ID 226431
  • [full text: PDF (639) KB)]
  • Abstract: In this work, we have demonstrated thermal stress relaxation in regenerated fiber Bragg gratings (RFBGs) by using direct CO2 laser annealing technique. After the isothermal annealing and slow cooling process, the Bragg wavelength of the RFBG has been red-shifted. This modification is reversible by re-annealing and rapid cooling. It is repeatable with different cooling process in the subsequent annealing treatments. This phenomenon can be attributed to the thermal stress modification in the fiber core by means of manipulation of glass transition temperature with different cooling rates. This finding in this investigation is important for accurate temperature measurement of RFBG in dynamic environment.

Keywords (OCIS):

  • (060.2280) Fiber optics and optical communications : Fiber design and fabrication
  • (060.2370) Fiber optics and optical communications : Fiber optics sensors
  • (060.3735) Fiber optics and optical communications : Fiber Bragg gratings

Optical phase cloning by an integrated dual-parallel Mach-Zehnder modulator

  • Marco Marangoni, Johannes Burkart, Tommaso Sala, KASSI Samir, and Daniele Romanini
  • received 11/13/2014; accepted 01/16/2015; posted 01/21/2015; Doc. ID 222450
  • [full text: PDF (641) KB)]
  • Abstract: The use of a dual-parallel Mach-Zehnder modulator in a feed-forward configuration is shown to serve the purpose of cloning the optical phase of a master oscillator on a Distributed-Feed-Back (DFB) slave laser exhibiting a multi-MHz-wide frequency noise spectrum. A residual phase error of 113 mrad is obtained together with an unprecedented control bandwidth of hundreds of megahertz and a gigahertz-level capture and tuning range. Besides offering a dramatic improvement over feedback loops, this approach is susceptible of hybrid integration in a cost-effective compact device benefiting from the wide tunability of DFB lasers, now available from the visible to the mid-infrared.

Keywords (OCIS):

  • (120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
  • (250.7360) Optoelectronics : Waveguide modulators
  • (140.3425) Lasers and laser optics : Laser stabilization

Universal Axial Fluctuations in Optical Tweezers

  • Felix Ritort, Anna Alemany, and Marco Ribezzi-Crivellari
  • received 12/08/2014; accepted 01/16/2015; posted 01/21/2015; Doc. ID 229174
  • [full text: PDF (755) KB)]
  • Abstract: Optical tweezers allow the measurement of fluctuations at the nano-scale, in particular fluctuations in the end-to-end distance in single molecules. Fluctuation spectra can yield valuable information, but they can easily be contaminated by instrumental effects. We identify axial fluctuations, i.e. fluctuations of the trapped beads in the direction of light propagation, as one of these instrumental effects. Remarkably, axial fluctuations occur on a characteristic timescale similar to that of conformational (folding) transitions, which may lead to misinterpretation of the experimental results. We show that a precise measurement of the effect of force on both axial and conformational fluctuations is crucial to disentangle them. Our results on axial fluctuations are captured by a simple and general formula valid for all optical tweezers setups and provide experimentalists with a general strategy to distinguish axial fluctuations from conformational transitions.

Keywords (OCIS):

  • (070.4790) Fourier optics and signal processing : Spectrum analysis
  • (140.7010) Lasers and laser optics : Laser trapping
  • (170.4520) Medical optics and biotechnology : Optical confinement and manipulation
  • (230.0230) Optical devices : Optical devices
  • (350.4855) Other areas of optics : Optical tweezers or optical manipulation

Articles 1 to 20 of 126 Next Page >>





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