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Journal of the Optical Society of America B

Journal of the Optical Society of America B

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Early Posting

Accepted papers to appear in an upcoming issue

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Articles 1 to 20 of 32 Next Page >>

July


Phase knob for switching steady-state behaviors from bistability to multi-stability via spontaneously generated coherence

  • Zhonghu Zhu, Ai-Xi Chen, Wen-Xing Yang, and Ray-Kuang Lee
  • received 05/14/2014; accepted 07/08/2014; posted 07/09/2014; Doc. ID 212078
  • [full text: PDF (497) KB)]
  • Abstract: We investigate theoretically the optical steady-state behavior in $N$ four-level Y-type atoms driven coherently by a probe laser and a single elliptically polarized field (EPF) by means of a unidirectional ring cavity. It is found that the optical bistability can be observed for a wide regime of frequency detuning of the probe field, intensity of the EPF and the atomic cooperation parameter. Interestingly enough, in principle the optical steady-state behavior can be switched from optical bistability to multistability or vice versa by adjusting the phase difference between two components of polarized electric field of the EPF if the perfect spontaneously generated coherence of atoms is included. Our results illustrate the potential to utilize EPF for all-optical switching in atomic system through the phase control, as well as a guidance in the design for possible experimental implementations.

Keywords (OCIS):

  • (190.0190) Nonlinear optics : Nonlinear optics
  • (190.1450) Nonlinear optics : Bistability
  • (270.0270) Quantum optics : Quantum optics
  • (270.1670) Quantum optics : Coherent optical effects

Light-trapping in guided modes of thin-film-silicon-on-silver waveguides by scattering from a nanostrip

  • Thomas Sondergaard, Yao-Chung Tsao, Peter Kristensen, Thomas Pedersen, and Kjeld Pedersen
  • received 05/22/2014; accepted 07/08/2014; posted 07/09/2014; Doc. ID 212606
  • [full text: PDF (848) KB)]
  • Abstract: Light-trapping in a waveguide configuration consisting of a thin planar film of hydrogenated amorphous silicon (aSi:H) on a planar silver back-reflector is studied theoretically and experimentally. Light-trapping is achieved by scattering of light from a silver or silicon nanostrip placed directly on the silicon-film surface. For thin films it is appropriate to think of light-trapping in terms of coupling into the guided modes of the air-aSi:H-silver waveguide configuration, which is the focus of this paper. Using the Green’s function surface integral equation method we calculate cross sections governing extinction, out-of-plane scattering, and scattering into guided modes. It is found for geometries with aSi:H-film thicknesses in the range of 50-500 nm that distinct peaks in extinction and scattering cross section spectra are located at wavelengths determined by the cut-off wavelengths of guided modes, and the wavelengths of those peaks are insensitive to the precise geometry of the scatterer. Measurements of extinction and scattering from an array of silver strips spaced by a large distance of 10 μm on the surface of a geometry with a 290 nm aSi:H-film are found to be in good agreement with theoretical predictions.

Keywords (OCIS):

  • (130.2790) Integrated optics : Guided waves
  • (240.6680) Optics at surfaces : Surface plasmons
  • (290.5820) Scattering : Scattering measurements
  • (050.1755) Diffraction and gratings : Computational electromagnetic methods
  • (290.5825) Scattering : Scattering theory
  • (050.6624) Diffraction and gratings : Subwavelength structures

Stochastic noise amplification in noninstantaneous Kerr media

  • G. da Silva, T. Lobo, and A. Canabarro
  • received 04/04/2014; accepted 07/03/2014; posted 07/07/2014; Doc. ID 209622
  • [full text: PDF (1314) KB)]
  • Abstract: Considering noninstantaneous Kerr nonlinearity, the propagation of a partially coherent optical beam are theoretically investigated by using extensions of the nonlinear Schr\"odinger equation (NLSE). In order to account for the partial coherence of the beam, a phase-diffusion model is used for the laser beam. To introduce the finite response time of the medium, a time dependent nonlinear response is incorporated in the system of NLSE using the Debye relaxation model. We analytically deduce the dispersion relation and numerically compute the gain spectra along with relevant second-order statistical quantities. A detailed study of how these statistical properties are influenced by the GVD regime as well as by the delayed nonlinear response of the material is presented. The distinct features for slow and fast delayed nonlinear response are also emphasized.

Keywords (OCIS):

  • (030.1640) Coherence and statistical optics : Coherence
  • (030.6600) Coherence and statistical optics : Statistical optics
  • (190.3100) Nonlinear optics : Instabilities and chaos
  • (190.5530) Nonlinear optics : Pulse propagation and temporal solitons
  • (190.5650) Nonlinear optics : Raman effect

Doppler broadened NICE-OHMS – Optimum modulation and demodulation conditions, cavity length, and modulation order

  • Isak Silander, Ove Axner, and Patrick Ehlers
  • received 05/01/2014; accepted 07/03/2014; posted 07/07/2014; Doc. ID 211230
  • [full text: PDF (637) KB)]
  • Abstract: Doppler broadened noise-immune cavity-enhanced optical heterodyne molecular spectrometry (Db-NICE-OHMS) has been scrutinized with respect to modulation and demodulation conditions (encompassing the modulation frequency, νm, the modulation index, β, and the detection phase, θ), the cavity length, L, and the modulation order, k, (defined as νm / νFSR where νFSR is the free-spectral range of the cavity) primarily in the Doppler limit but also for a specific situation in the Voigt regime (for equal Doppler and homogeneous width), both in the absence and presence of optical saturation. It is found that, for a system with a given cavity length, the optimum conditions (i.e. those that produce the largest NICE-OHMS signal) for an unsaturated transition in the Doppler limit comprise νm/ΓD = 1.6 (where ΓD is the HWHM of the Doppler width of the transition), β = 1.3, and θ = 0.78π. It is also found that the maximum is rather broad, the signal takes 95% of its maximum value for modulation frequencies in the entire 0.4 ≤ νm / ΓD ≤ 2.4 range. When optical saturation sets in, θ shifts towards the dispersion phase. The optimum conditions encompass k>1 whenever L > 0.35 LD and 2.6 LD for the dispersion and absorption modes of detection, respectively [where LD is a characteristic length given by c/(2 ΓD)]. Similar conditions are found for the case with a Voigt profile.

Keywords (OCIS):

  • (120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
  • (140.4780) Lasers and laser optics : Optical resonators
  • (300.6310) Spectroscopy : Spectroscopy, heterodyne
  • (300.6380) Spectroscopy : Spectroscopy, modulation
  • (300.6390) Spectroscopy : Spectroscopy, molecular
  • (140.3518) Lasers and laser optics : Lasers, frequency modulated

(PNR2014) Absolute spectral calibration of an intensified CCD camera using twin beams

  • Ondrej Haderka, Jan Perina, Vaclav Michalek, and Martin Hamar
  • received 04/23/2014; accepted 07/01/2014; posted 07/03/2014; Doc. ID 210718
  • [full text: PDF (568) KB)]
  • Abstract: Twin beams composed of photon pairs are used for absolute determination of quantum detection efficiency of an intensified CCD camera. A method of fitting the experimental photocount statistics with the paired superposition of signal and noise combined with additional determination of losses in the beams before the detector is used to reveal the detection efficiencies. The experiment has been performed in several spectral regions defined by the used interference filters. Also, the used twin beams have been reconstructed.

Keywords (OCIS):

  • (230.5160) Optical devices : Photodetectors
  • (270.0270) Quantum optics : Quantum optics
  • (270.5290) Quantum optics : Photon statistics
  • (190.4975) Nonlinear optics : Parametric processes

June


Phase-controlled optical bistability via electromagnetically induced absorption

  • Azar Vafafard, Hadisossadat Zaakeri, Lida Ebrahimi Zohravi, and Mohammad Mahmoudi
  • received 02/18/2014; accepted 06/30/2014; posted 06/30/2014; Doc. ID 205682
  • [full text: PDF (418) KB)]
  • Abstract: The optical properties of a four-level double $V$-type closed-loop system is studied in multi-photon resonance condition. It is shown that the phase-dependent electromagnetically induced transparency (EIT) window is established and by changing the relative phase of applied fields, the EIT switches to the electromagnetically induced absorption (EIA). Moreover, the optical bistability (OB) behavior of the system is studied and it is demonstrated that the Cross-Kerr effect induced OB depends on the relative phase of applied fields and it can be controlled by either intensity or relative phase of laser fields. By applying a microwave field to drive the hyperfine transition between two lower states, the optical properties change and the OB switches to the optical multistability (OM). This can be used as a detection of longer wavelengths than the visible light.

Keywords (OCIS):

  • (190.1450) Nonlinear optics : Bistability
  • (190.3270) Nonlinear optics : Kerr effect
  • (190.4180) Nonlinear optics : Multiphoton processes
  • (350.4010) Other areas of optics : Microwaves

Comparison of Amplitude Noise of a Fiber Optical Parametric Oscillator and a Supercontinuum Source

  • Leily Kiani, Thompson Lu, and Jay Sharping
  • received 03/18/2014; accepted 06/27/2014; posted 06/30/2014; Doc. ID 207831
  • [full text: PDF (1227) KB)]
  • Abstract: Fiber based optical parametric oscillators (FOPOs) are an alternative to supercontinuum light sources for nonlinear optical microscopy. In nonlinear microscopy implementations such as stimulated Raman scattering (SRS) and coherent anti-Stokes Raman scattering (CARS) the signal noise is proportional to the second or third order of the input intensity noise. It is not yet known how FOPO intensity noise levels compare with supercontinuum sources. We measure relative intensity noise (RIN) for a FOPO and a similar supercontinuum source as a function of input power and wavelength. We find that the FOPO sideband RIN can be as low as 5 dB above the shot noise limit of -150 dBc[Hz]-¹. This FOPO can reach RIN levels 50 dB below that of spectral slices of supercontinuum output in a similar spectral range.

Keywords (OCIS):

  • (190.4970) Nonlinear optics : Parametric oscillators and amplifiers
  • (180.4315) Microscopy : Nonlinear microscopy
  • (180.5655) Microscopy : Raman microscopy

Purcell effect for finite-length metal-coated and metal nanowires

  • Konstantin Filonenko, Morten Willatzen, and Vladimir Bordo
  • received 03/18/2014; accepted 06/27/2014; posted 06/30/2014; Doc. ID 208001
  • [full text: PDF (706) KB)]
  • Abstract: We investigate the modification (enhancement and suppression) of spontaneous emission rate of a dipole emitter in two configurations: inside a finite-length semiconductor nanowire surrounded by bulk metal and in the vicinity of a finite metal nanowire. Our analysis is based on a first-principle approach, which is reduced to a semi-analytic one in the limit of large nanowire aspect ratios. The numerical calculations are carried out for an emitter in a GaAs nanowire embedded in Ag or Au and for that nearby an Ag or Au nanowire in vacuum or dielectric. We consider in detail the Purcell and $\beta$ - factors as functions of the cylinder radius, the emitter position and transition frequency for both configurations. We contrast the results for finite-length nanowires with those obtained in the infinite-length approximation and find considerable difference in the Purcell factor magnitude.

Keywords (OCIS):

  • (240.5420) Optics at surfaces : Polaritons
  • (240.6680) Optics at surfaces : Surface plasmons
  • (260.3910) Physical optics : Metal optics
  • (070.5753) Fourier optics and signal processing : Resonators
  • (050.6624) Diffraction and gratings : Subwavelength structures
  • (250.5590) Optoelectronics : Quantum-well, -wire and -dot devices

Precision frequency measurement of N₂O transitions near 4.5 μm and above 150 μm

  • Wei-Jo Ting, Chun-Hung Chang, Shih-En Chen, Hsuan-Chen Chen, Jow-Tsong Shy, Brian Drouin, and Adam Daly
  • received 04/01/2014; accepted 06/27/2014; posted 06/30/2014; Doc. ID 209215
  • [full text: PDF (721) KB)]
  • Abstract: Frequency measurements are given for the 10⁰0 ← 00⁰0 band of N₂O near 4.5 μm and for pure rotational transitions beyond 151.5 μm. The infrared measurements utilize a periodically-poled lithium niobate (PPLN) based difference frequency generation (DFG) source locked to the saturated absorption center of an N₂O absorption line. The DFG frequency is calibrated by an optical frequency comb and an iodine hyperfine transition. We report 44 transitions ranging from J = 1 – 100 for both the P- and R- branches and the accuracy is better than 10 kHz for most transitions. In addition, 175 pure rotational transitions have been measured including 33 measurements with sub-Doppler precision (≤ 3 kHz), and 142 Doppler limited measurements. These are combined with other precision rotational and vibrational measurements to provide improved quantum mechanical parameters as well as frequency calibration tables for the N₂O bands near 4.5 μm.

Keywords (OCIS):

  • (300.6340) Spectroscopy : Spectroscopy, infrared
  • (300.6390) Spectroscopy : Spectroscopy, molecular
  • (300.6460) Spectroscopy : Spectroscopy, saturation

Local Field Effects for Spherical Quantum Dot Emitters in the Proximity to a Planar Dielectric Interface

  • J. Gordon and Yu. Gartstein
  • received 04/11/2014; accepted 06/27/2014; posted 06/30/2014; Doc. ID 209990
  • [full text: PDF (521) KB)]
  • Abstract: We use numerical solutions of macroscopic Maxwell's equations to study spontaneous emission rates of model spherical quantum dot (QD) emitters in the vicinity of a highly polarizable dielectric substrate. It is demonstrated that extra polarization of the QD body taking place in the interfacial region may lead to appreciable deviations from the rates that would be expected under the assumption of a fixed magnitude of the effective QD transition dipole moment. Illustrations are given for both radiative and non-radiative decay processes and potential experimental implications are discussed.

Keywords (OCIS):

  • (160.6000) Materials : Semiconductor materials
  • (260.2160) Physical optics : Energy transfer
  • (300.2140) Spectroscopy : Emission
  • (250.5590) Optoelectronics : Quantum-well, -wire and -dot devices

Feasibility of UV lasing without inversion in mercury vapor

  • Martin Sturm, Benjamin Rein, Thomas Walther, and Reinhold Walser
  • received 04/16/2014; accepted 06/24/2014; posted 06/26/2014; Doc. ID 210349
  • [full text: PDF (679) KB)]
  • Abstract: We investigate the feasibility of UV lasing without inversion at a wavelength of 253.7 nm utilizing interacting dark resonances in mercury vapor. Our theoretical analysis starts with radiation damped optical Bloch equations for all relevant 13 atomic levels. These master equations are generalized by considering technical phase noise of the driving lasers. From the Doppler broadened complex susceptibility we obtain the stationary output power from semiclassical laser theory. The finite overlap of the driving Gaussian laser beams defines an ellipsoidal inhomogeneous gain distribution. Therefore, we evaluate the intra-cavity field inside a ring laser self-consistently with Fourier optics. This analysis confirms the feasibility of UV lasing and reveals its dependence on experimental parameters.

Keywords (OCIS):

  • (140.4780) Lasers and laser optics : Optical resonators
  • (140.7240) Lasers and laser optics : UV, EUV, and X-ray lasers
  • (270.1670) Quantum optics : Coherent optical effects
  • (270.3430) Quantum optics : Laser theory

Quantifying the source of enhancement in experimental continuous variable quantum illumination

  • Sammy Ragy, Ivano Ruo Berchera, Ivo Degiovanni, Stefano Olivares, Matteo Paris, Gerardo Adesso, and Marco Genovese
  • received 04/04/2014; accepted 06/23/2014; posted 07/09/2014; Doc. ID 209289
  • [full text: PDF (730) KB)]
  • Abstract: A quantum illumination protocol exploits correlated light beams to enhance the probability of detection of a partially reflecting object lying in a very noisy background. Recently a simple photon-number-detection based implementation of a quantum illumination-like scheme has been provided in [Lopaeva {\it et al,}, Phys. Rev. Lett. {\bf 101}, 153603 (2013)] where the enhancement is preserved despite the loss of non-classicality. In the present paper we investigate the source for quantum advantage in that realization, by analysing the mutual information in an effective two-mode description of the light sources. We find that the improvement in the signal-to-noise ratio achieved by the entangled sources over the unentangled thermal ones is closely related to the respective ratio of mutual informations, with both quantities being specified by the squared ratio of the corresponding cross-correlations in the relevant regime of a highly thermalized background. An analysis of the experimental data confirms this theoretical result.

Keywords (OCIS):

  • (270.5570) Quantum optics : Quantum detectors
  • (270.6570) Quantum optics : Squeezed states
  • (270.5585) Quantum optics : Quantum information and processing

Generation of 130 mW of 397.5 nm tunable laser via ring-cavity-enhanced frequency doubling

  • Yashuai HAN, Xin WEN, Jiandong BAI, Baodong YANG, Yanhua WANG, Jun HE, and Junmin WANG
  • received 04/18/2014; accepted 06/23/2014; posted 06/24/2014; Doc. ID 210417
  • [full text: PDF (650) KB)]
  • Abstract: We report on the frequency doubling of a TA-boosted DBR continuous-wave (cw) laser system at 795 nm, using a PPKTP crystal placed in an external ring cavity. A tunable 397.5 nm violet laser power of 130 mW with a mode-matched input 795 nm laser power of 416 mW is obtained (conversion efficiency η = 31%), limited by thermally induced bistability. With a scanning cavity, the peak violet laser power rises up to 180 mW, corresponding to an overall efficiency of η = 43%. The generated 397.5 nm laser with good beam quality and satisfying power has huge potential use in quantum optics and cold atom physics.

Keywords (OCIS):

  • (140.2020) Lasers and laser optics : Diode lasers
  • (190.2620) Nonlinear optics : Harmonic generation and mixing
  • (070.5753) Fourier optics and signal processing : Resonators

Electronic properties of undoped LiBaAlF₆ single crystals: far ultraviolet optical, luminescence and X-ray photoelectron spectroscopy studies

  • Vladimir Pustovarov, Igor Ogorodnikov, Sergey Omelkov, Dmitry Spassky, and Ludmila Isaenko
  • received 03/21/2014; accepted 06/22/2014; posted 06/26/2014; Doc. ID 208652
  • [full text: PDF (678) KB)]
  • Abstract: The electronic structure properties of undoped single crystals of LiBaAlF₆ (LBAF) were determined using low-temperature (T = 10 K) time-resolved far ultraviolet (3.7–40 eV) synchrotron radiation spectroscopy, calculations for the spectra of optical functions and X-ray photoelectron spectroscopy. The bandgap of investigated compound was found at Eg = 12.3 eV, the energy threshold for creation of the unrelaxed excitons at En=1 = 11.6 eV, and the low-energy fundamental absorption edge at 11.0 eV. The subnanosecond photoluminescnece emission band at 6.6 eV in LBAF single crystal is due to radiative valence-core transitions 2p F¯ → 5p Ba²+.

Keywords (OCIS):

  • (160.3220) Materials : Ionic crystals
  • (160.3380) Materials : Laser materials
  • (300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
  • (300.6500) Spectroscopy : Spectroscopy, time-resolved

Influence of nonlinear effects on the three-photon excitation of L-Tryptophan in water using phase-shaped pulses

  • Alexander Patas, Georg Achazi, Christopher Winta, and Albrecht Lindinger
  • received 04/01/2014; accepted 06/22/2014; posted 06/24/2014; Doc. ID 209137
  • [full text: PDF (571) KB)]
  • Abstract: We demonstrate the control of the three-photon excitation of L-Tryptophan in water using a pulse shaping setup. This can lead to selective excitation of amino acids by a near infrared femtosecond laser source. Furthermore we show that additional nonlinear effects like self-phase modulation in the sample have to be considered when using this approach. Simulations of the propagation of the laser pulses in the cuvette exhibit a good agreement to the experimental fluorescence scans at different laser intensities and show large discrepancies when neglecting nonlinear effects prior to the three-photon process.

Keywords (OCIS):

  • (190.7110) Nonlinear optics : Ultrafast nonlinear optics
  • (300.2530) Spectroscopy : Fluorescence, laser-induced
  • (300.6410) Spectroscopy : Spectroscopy, multiphoton
  • (320.5540) Ultrafast optics : Pulse shaping

Potentials for large optical gain improvement of Erbiumdoped slot waveguide amplifiers in silicon photonics

  • Samuel Serna, Weiwei Zhang, Xavier Leroux, Dingshan GAO, Daming ZHANG, Laurent Vivien, and Eric Cassan
  • received 04/24/2014; accepted 06/21/2014; posted 06/30/2014; Doc. ID 210518
  • [full text: PDF (3182) KB)]
  • Abstract: The potentials for on-chip optical amplification at  􀯦 =1530 nm in silicon photonics using Erbium-doped rich polymers integrated in silicon slot waveguides are investigated by using a four level spectroscopic model and a pumping wavelength of 1.48μm. It is shown that the key parameter driving the whole amplification efficiency is the slot waveguide linear loss level, while optimization of the hollow core waveguide cross-section leads to a slot width around 130nm. Our investigations show that an on-chip optical gain of about 10dB can be obtained with 7dB/cm loss slot waveguides. Such a propagation loss is directly sustained by experimental results obtained for photonic structures fabricated using silicon technology. Due to the likelihood of improved technological processes in a near future, the slot waveguide loss level was swept in the 3dB/cm-10dB/cm range, showing that on-chip optical gain up to 30dB can be seriously envisaged for slot waveguides with optimized optical losses around 3dB/cm.

Keywords (OCIS):

  • (130.1750) Integrated optics : Components
  • (130.3120) Integrated optics : Integrated optics devices
  • (230.4480) Optical devices : Optical amplifiers

Three-photon excitation of upconversion random laser in ZnO-on-Si nanostructured films

  • C. Dominguez, M. Vieira, R. Oliveira, M. Ueda, Cid B. de Araujo, and Anderson S. Gomes
  • received 05/27/2014; accepted 06/20/2014; posted 06/30/2014; Doc. ID 212886
  • [full text: PDF (4730) KB)]
  • Abstract: We report the first observation of ultraviolet upconversion random laser (RL) emission from ZnO films excited by three near-infrared photons in the femtosecond regime. The nanostructured films of ZnO were fabricated on a silicon substrate using the Plasma Immersion Ion Implantation and Deposition method. The band-to-band excitation process led to RL emission with incoherent feedback, emitting light at ≈ 390 nm. RL emissions excited by one- and two-photons were also verified using the same pump geometry. The results are discussed and a comparison with previous studies is presented.

Keywords (OCIS):

  • (140.3610) Lasers and laser optics : Lasers, ultraviolet
  • (140.5960) Lasers and laser optics : Semiconductor lasers
  • (160.6000) Materials : Semiconductor materials
  • (190.4180) Nonlinear optics : Multiphoton processes
  • (290.4210) Scattering : Multiple scattering

Prediction of the Noise Spectrum in Optoelectronic Oscillators: An Analytical Conversion Matrix Approach

  • Sajad Jahanbakht, S. Esmail Hosseini, and Ali Banai
  • received 04/23/2014; accepted 06/20/2014; posted 06/24/2014; Doc. ID 208354
  • [full text: PDF (811) KB)]
  • Abstract: In this paper an analytical formulation based on the conversion matrix approach for characterizing the oscillator noise spectra as well as the phase and amplitude noise spectra for a single loop optoelectronic oscillator (OEO) is presented. The validity of this approach is verified by comparing our results regarding the noise spectra of the OEO against the results of two references in the literature. The first reference presents simulation results and the second reference presents both simulation and measurement results and good agreement is seen between the results of the new method and those of the references. The advantage of the new approach is the simplicity of the theory as well as the systematic nature of the analysis which can easily be generalized to find analytical solutions for other noise analysis problems and other more complicated oscillator topologies.

Keywords (OCIS):

  • (230.4910) Optical devices : Oscillators
  • (250.0250) Optoelectronics : Optoelectronics
  • (350.4010) Other areas of optics : Microwaves

Modulation instability in nonlinear complex parity-time (PT) symmetric periodic structures

  • Amarendra Sarma
  • received 03/25/2014; accepted 06/19/2014; posted 06/24/2014; Doc. ID 208880
  • [full text: PDF (988) KB)]
  • Abstract: We carry out a modulation instability (MI) analysis in nonlinear complex parity-time (PT) symmetric periodic structures. All the three regimes defined by the PT-symmetry breaking point or threshold, namely, below threshold, at threshold and above threshold are discussed. It is found that MI exists even beyond the PT-symmetry threshold indicating the possible existence of solitons or solitary waves, in conformity with some recent reports. We find that MI does not exist at the PT-symmetry breaking point in the case of normal dispersion below a certain nonlinear threshold. However, in the case of anomalous dispersion regime, MI does exist even at the PTsymmetry breaking point.

Keywords (OCIS):

  • (060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
  • (190.3100) Nonlinear optics : Instabilities and chaos
  • (190.4370) Nonlinear optics : Nonlinear optics, fibers
  • (060.3735) Fiber optics and optical communications : Fiber Bragg gratings

Experimental study of random fiber laser made from combination of SMF and DCF

  • Ye Yu Zhu, Wei Li Zhang, Yun Jiang Rao, Shi Wei Li, Yi Li, Zi Nan Wang, Xin Hong Jia, and Rui Ma
  • received 03/10/2014; accepted 06/17/2014; posted 06/26/2014; Doc. ID 207968
  • [full text: PDF (1305) KB)]
  • Abstract: Random lasing (RL) characteristics through different combinations of single-mode fiber (SMF) and dispersion compensated fiber (DCF) with a Raman pump (i.e., the DCF is mounted at the front or at the end of the SMF, the length of the SMF and DCF is also changeable) are studied in this paper. The results indicate that the position and length ratio of DCF and SMF influence the output of Random distributed feedback fiber laser (RDF-FL) greatly (i.e., lasing threshold, spectrum stability and shape etc.). When DCF is located at a position where higher laser power is distributed, RL can be enhanced remarkably. In addition, 2nd-order RDF-FL is realized in a SMF/DCF mixed cavity pumped bi-directionally from the fiber center, indicating that pump method is also an important factor to influence the performance of RDF-FL. These results are useful to reveal the role of DCF in RL and light amplification, and also provide theoretical support for flexible design and optimization of RDF-FL.

Keywords (OCIS):

  • (140.3490) Lasers and laser optics : Lasers, distributed-feedback
  • (140.3510) Lasers and laser optics : Lasers, fiber
  • (190.4360) Nonlinear optics : Nonlinear optics, devices

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