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Aoxiang Lin,Pramod Ramdasrao Watekar,Won-Taek Han,김복현 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.3
Investigating with a continuous-wave 488-nm argon-ion laser, we firstly report on the visible optical limiting properties of germano-silicate optical fibers with gold nanoparticles incorporated. The ground-state conduction, the surface plasmon band and the free carrier band were considered as a three-level model to theoretically explain the obtained optical limiting behaviors. In the visible wavelength region around the surface plasmon resonance absorption peak of the gold nanoparticles, the effective nonlinear absorption coefficient was estimated to be 22.4 cm/GW.
Tellurium-enhanced nonresonant third-order optical nonlinearity in a germanosilicate optical fiber.
Lin, Aoxiang,Liu, Xueming,Watekar, Pramod R,Zhao, Wei,Peng, Bo,Lu, Min,Wei, Wei,Sun, Chuandong,Wang, Yishan,Han, Won-Taek,Toulouse, Jean Optical Society of America 2009 Applied Optics Vol.48 No.26
<P>A tellurium-doped germanosilicate optical fiber was developed by modified chemical vapor deposition and solution doping techniques. Using the continuous-wave self-phase modulation method, the nonresonant nonlinear refractive index, n2, was measured to be 5.52 x 10(-20) m2/W, which is 2 to 3 times that of the undoped germanosilicate glass fiber. Polyhedron structures TeO3 and TeO4 with GeO4 and SiO4 are believed responsible for lower phonon energy, more nonbridging oxygens, and a larger hyperpolarization, leading to the observed higher nonresonant optical nonlinearity.</P>
Intense green upconversion emission in Tb^3+/Yb^3+ codoped alumino-germano-silicate optical fibers
Lin, Aoxiang,Liu, Xueming,Watekar, Pramod R.,Guo, Haitao,Peng, Bo,Wei,Lu, Min,Han, Won-Taek,Toulouse, Jean The Optical Society 2010 Applied optics Vol.49 No.9
<P>We observed intense green upconversion emission from Tb(3+) centered at 546 nm due to transition D(4)5-->F(5)7 in Tb(3+)/Yb(3+) codoped alumino-germano-silicate optical fibers by direct excitation of Yb(3+) ions with a laser diode at 976 nm. A two-photon cooperative energy transfer upconversion among a pair of Yb(3+) donor ions and a Tb(3+) acceptor ion are responsible for the observed green emission. Appropriately increasing the concentration of Tb(3+) relative to Yb(3+) was found to facilitate the energy transfer upconversion process from Yb(3+) to Tb(3+), while an excess of Tb(3+) ions inversely introduced more of the concentration quenching effect and phonon-assistant backward energy transfer from Tb(3+) to Yb(3+) and, therefore, damaged the observed green emission. The intensity of the observed green emission was found optimum for a concentration ratio of Tb(3+) to Yb(3+) of 2:1 in alumino-germano-silicate optical glass fibers.</P>
Effect of Helical Bending on Gain Beyond 1650-nm of an Er-Doped Optical Fiber Amplier
한원택,Pramod R. Watekar,Aoxiang Lin,주성민 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.3
An Er-doped optical fiber amplifier sensitized with Yb ions was developed with a two-coresthree-claddings layer structure. Extended L-band amplification over 1650-nm was achieved upon 980-nm pumping with helical bending. The gain after helical bending was about 12 dB at 1700-nm.
한원택,Hye Jin Cho,Aoxiang Lin,Songbae Moon,김복현 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.3
The non-resonant optical nonlinearity of a germano-silicate glas optical fiber with silicon (Si) nanocrystals incorporated, fabricated by using a modified chemical vapor deposition proces, was investigated by the continuous-wave self-phase modulation method. The measured non-resonant nonlinear refractive index, n2 = 5.70 ×10-20 m2/W, of the fiber was found to be ∽2 times larger than that of the fiber without Si incorporation.
Linear and Nonlinear Optical Properties of Si Nanoparticles/ Er-Ions Doped Optical Fiber
Watekar, P.R.,Songbae Moon,Aoxiang Lin,Seongmin Ju,Won-Taek Han IEEE 2009 Journal of Lightwave Technology Vol.27 No.5
<P>An alumino-germano-silica glass fiber doped with silicon nanoparticles and erbium ions was fabricated using the modified chemical vapor deposition (MCVD) method. Optical properties of the glass fiber were investigated using a Judd-Ofelt analysis. It was found that incorporating silicon nanoparticles with erbium ions did not alter Er-related optical properties of the silica glass fiber. The incorporation of silicon particles in a fiber core caused wide band absorption from 480 nm to 1200 nm. A third order optical nonlinearity of the Si-Er-doped alumino-germano-silica glass fiber was measured to be about 3.8 x 10<SUP>-15</SUP> m<SUP>2</SUP>/W.</P>
Kim, Bok Hyeon,Lee, Seung Ho,Lin, Aoxiang,Lee, Chang-Lyoul,Lee, Jongmin,Han, Won-Taek The Optical Society 2009 Optics express Vol.17 No.3
<P>The large temperature sensitivity of the Sagnac loop interferometer based on the birefringent holey fiber filled with metal indium was experimentally demonstrated. The temperature sensitivities of the wavelength shift of the interferometer and the birefringence the fiber with indium were measured to be -6.3 nm/K and -3.3x10(-6) /K, respectively. The large temperature sensitivity of the fiber was explained by introduction of the fiber birefringence change originated from the large thermal expansion property of the metal indium at the elevated temperature.</P>