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Gain Medium (gain + medium)

Distribution by Scientific Domains
Physics and Astronomy77%

Selected Abstracts

Multi-wavelength fiber laser in the S-band region using a Sagnac loop mirror as a comb generator in an SOA gain medium

LASER PHYSICS LETTERS, Issue 9 2010
M.Z. Zulkifii
Abstract A simple design of multi-wavelength generation in the S-band region of the optical network transmission is proposed. The design consists of broad-band fiber Bragg grating (BB-FBG), which acts as a filter to enhance operation in the S-band region. A Sagnac loop mirror (SLM) is used to generate multiple wavelength oscillations in the ring cavity. The output consists of 60 lasing wavelengths oscillating simultaneously between 1464 nm and 1521 nm with a spacing of 0.92 nm and an output linewidth of 0.66 nm. (© 2010 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

Broadband wavelength-tunable single-longitudinalmode erbium-doped fiber ring laser using saturable-absorber filter

LASER PHYSICS LETTERS, Issue 2 2010
C.H. Yeh
Abstract In this paper, a broadband wavelength-tunable erbiumdoped fiber (EDF) ring laser with single longitudinal mode (SLM) output achieving 82.6 nm lasing bandwidth from 1481.0 to 1563.6 nm is proposed and experimentally demonstrated. For the proposed laser scheme, the S- and C-band erbium-doped fiber amplifiers (EDFAs) in parallel structure are used to serve as the gain medium for broadband wavelength tuning. Furthermore, we use a saturable-absorber filter (SAF) inside the fiber cavity to serve as a narrow band filter to guarantee a SLM operation. Besides, the performance of output power, wavelength, side-mode suppression ratio (SMSR) and stability are also analyzed and discussed. (© 2010 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

Laser and nonlinear-laser properties of undoped and Nd3+ -doped orthorhombic Ca(NbO3)2 single crystals: new stimulated-emission performance and high-order picosecond stimulated Raman scattering covering more than two octave Stokes and anti-Stokes wavelengths

LASER PHYSICS LETTERS, Issue 11 2009
A.A. Kaminskii
Abstract We report new laser and nonlinear-laser properties of Nd3+ -ion doped and undoped orthorhombic calcium niobate. In particular, we show that: Nd3+:Ca(NbO3)2 is a promising gain medium for LD-pumped microchip lasers and undoped Ca(NbO3)2 can give rise to high-order lasing covering more than two-octave Stokes and anti-Stokes frequency comb in the visible and near-IR region. We measured also the main spectroscopic intensity characteristics related to the observed laser performance and identified their physical nature. (© 2009 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

A linear cavity Brillouin fiber laser with multiple wavelengths output

LASER PHYSICS LETTERS, Issue 5 2008
M.R. Shirazi
Abstract A linear cavity Brillouin fiber laser (BFL) is proposed and demonstrated for multi-wavelength operation. The BFL uses a single mode fiber (SMF) as a non-linear gain medium and an optical circulator to generate a linear cavity resonator. Two couplers are used to inject the Brillouin Pump (BP) and tap the BFL output respectively. The effect of the coupler ratio on the BFL performance is studied by keeping constant the ratio of the first coupler and varying the ratio of the second coupler. 11 simultaneous lines with a line spacing of 0.8 nm are obtained at a BP of 11.7 dBm and a coupler ratio of 95:5. The laser output is stable at room temperature with 5 lines obtained at above , 30 dBm, and has the largest signal to noise ratio observed at the remaining lines. The proposed BFL has the advantage of being able to operate at any wavelength and is only dependent on the available BP wavelength. (© 2008 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

Edge-pumped asymmetric Yb:YAG/YAG thin disk laser

LASER PHYSICS LETTERS, Issue 10 2007
Q. Liu
Abstract An edge-pumping scheme for a quasi-three-level solid-state laser using asymmetric crystal is reported. The scheme uses a thin disk laser configuration with the pump light incident from disk edges. The pump light propagates through the disk along the zigzag path and repeatedly passes the gain medium, thus improving the pump uniformity and absorption efficiency. A maximum output power of over 123 W was achieved from an edge-pumped composite Yb:YAG/YAG thin disk laser, with slope efficiency of 34.8% and beam quality M2 , 20. (© 2007 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

Temperature-tuning Yb:YAG microchip lasers

LASER PHYSICS LETTERS, Issue 9 2005
Jun Dong
Abstract Based on the quasi-three-level system, a theoretical model of diode-laser end-pumped fundamental continuous-wave (CW) Yb3+:YAG microchip lasers is proposed. The fluorescence concentration quenching effect, the temperature dependent mechanical and optical properties and the absorption efficiency of the host have been taken into account in the model. The theoretical results of the numerical calculations are in good agreement with those of experiments. The effects of the concentration of the Yb3+:YAG crystal, the thickness of the Yb3+:YAG crystal, the temperature and the transmission of the output coupler on the laser performance (threshold and output power) are addressed. The optimization of the concentration and the thickness for the Yb3+:YAG crystal microchip laser is presented. The effects of the temperature and the pump power intensity on the optical-tooptical efficiency are discussed. The output power can be scaled by increase the working area of the laser gain medium. This modeling is not only applicable to Yb3+:YAG crystal microchip laser but also to other quasi-three-level microchip lasers. (© 2005 by Astro, Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

Dark soliton generation using dual Brillouin fiber laser in a fiber optic ring resonator

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2010
S. F. Hanim
Abstract Stable dark soliton pulses have been successfully generated in an erbium doped dispersion compensated fiber (DCF) using an enhanced dual Brillouin fiber laser (DBFL) scheme.Multidark soliton pulses generation in an S-band erbium doped depressed cladding fiber (DC-EDF) using a multiwavelength Brillouin fiber laser (MW-BFL). Configuration has also been successfully demonstrated. The hybrid amplification from the 300 mW power of Raman pump (RP), 7.7 km long DCF, and 30 m DC-EDF that is being pumped bidirectionally results in a stable multiwavelength Brillouin peaks in the S-band region. Results obtained shows that the insertion of linear gain medium with bidirectional pumping of the DC-EDF into the cavity gives significant amplification and promotes the formation of stokes peaks in the S-band region. The number of Brillouin peaks generated is closely dependent on the DBFL and MW-BFL configuration, the Brillouin pump (BP) signal wavelength, the BP coupling ratio, and the RP power. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:881,883, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25036 [source]

A method stabilizing the wavelength of mode-locked fiber laser with injected continuous wave,

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2006
Likai Zhu
Abstract Stimulated by an injected continuous wave, a set of longitudinal modes wins the competition for gain medium continuously. In this paper, the linewidth of the longitudinal mode is broadened by the injected continuous wave. The wavelength of an actively mode-locked fiber laser based on EDFA is stabilized in the experiment. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1385,1388, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21645 [source]

Lu2O3:Yb3+ ceramics , a novel gain material for high-power solid-state lasers

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 1 2005
K. Takaichi
Abstract We have developed Yb3+:Lu2O3 ceramics with nanocrystalline technology and a vacuum sintering method. A laser diode end-pumped efficient Yb3+:Lu2O3 ceramic laser was demonstrated. A 0.7 W cw output power was obtained with the slope efficiency of ,36% at 1035 nm wavelength, and 0.95 W with the slope efficiency of ,53% at 1079 nm. We classify the Lu2O3:Yb3+ ceramics as gain medium for high-power solid-state lasers (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]