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Fast photorefractive response of vanadium-doped lithium niobate in the visible region
Yinfeng Dong, Shiguo Liu, Yongfa Kong, Shaolin Chen, Romano Rupp, Jingjun Xu
A series of vanadium-doped lithium niobate crystals was grown and their photorefractive properties were investigated with a 532 nm laser. At a total light intensity of 471??mW/cm^2, a short response time of only 0.57 s was achieved for 0.1 mol.% vanadium in LiNbO_3. The photorefractive process is ... [Opt. Lett. 37, 1841-1843 (2012)]
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Matching of the propagation constants in an asymmetric single-mode fused fiber coupler for core pumping thulium-doped fiber at 795 nm
Gabriel Pelegrina-Bonilla, Katharina Hausmann, Kai Liu, Hakan Sayinc, Uwe Morgner, Jörg Neumann, Dietmar Kracht
We developed a fused fiber coupler (FFC) capable of multiplexing wavelengths in the range of 795 nm and 2 ?m. A simple 2D simulation model to calculate the pretaper length for matching the propagation constants in the coupling region was established. Based on the numerical data, we fabricated ... [Opt. Lett. 37, 1844-1846 (2012)]
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Infrared cylindrical cloak in nanosphere dispersed liquid crystal metamaterial
G. Pawlik, K. Tarnowski, W. Walasik, A. C. Mitus, I. C. Khoo
We present a design of an infrared cylindrical cloak using nanosphere dispersed nematic liquid crystal (NLC) metamaterial following the approach of Smith?s group [Science 314, 977 (2006)]. Cloaking conditions require spatial distribution of liquid crystal birefringence with constant ... [Opt. Lett. 37, 1847-1849 (2012)]
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Single-frequency, Q-switched Ho:YAG laser at room temperature injection-seeded by two F?P etalons-restricted Tm, Ho:YAG laser
T. Y. Dai, Y. L. Ju, B. Q. Yao, Y. J. Shen, W. Wang, Y. Z. Wang
We demonstrated a 1.91 ?m pumped, injection-seeded Q-switched Ho:YAG laser operating at room temperature. By inserting two Fabry?Perot etalons into the laser cavity, single-frequency Tm, Ho:YAG seed lasing was achieved at a wavelength of 2090.9 nm, with a typical output power of 60 mW. ... [Opt. Lett. 37, 1850-1852 (2012)]
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Poly(styrene)-based graded-index plastic optical fiber for home networks
Yoshihisa Akimoto, Makoto Asai, Kotaro Koike, Kenji Makino, Yasuhiro Koike
We investigated poly(styrene) (PSt)-based graded-index plastic optical fiber (GI-POF) with low loss and high bandwidth for home networks. To install the GI-POF in home networks, the attenuation must be below 200??dB/km at a 670?680 nm wavelength, and the bandwidth must be over 2.0 GHz for ... [Opt. Lett. 37, 1853-1855 (2012)]
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Z-scan measurement of the nonlinear refractive index of graphene
Han Zhang, Stéphane Virally, Qiaoliang Bao, Loh Kian Ping, Serge Massar, Nicolas Godbout, Pascal Kockaert
Under strong laser illumination, few-layer graphene exhibits both a transmittance increase due to saturable absorption and a nonlinear phase shift. Here, we unambiguously distinguish these two nonlinear optical effects and identify both real and imaginary parts of the complex nonlinear refractive ... [Opt. Lett. 37, 1856-1858 (2012)]
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6.1 W single frequency laser output at 1645 nm from a resonantly pumped Er:YAG nonplanar ring oscillator
Chunqing Gao, Lingni Zhu, Ran Wang, Mingwei Gao, Yan Zheng, Lei Wang
A monolithic 1645 nm Er:YAG nonplanar ring oscillator (NPRO) resonantly pumped by a 1532 nm fiber laser is demonstrated. For reducing the energy-transfer upconversion effect, a 0.5% doped Er:YAG nonplanar crystal was used. An up to 6.1 W single frequency laser output at 1645 nm was obtained, with a ... [Opt. Lett. 37, 1859-1861 (2012)]
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Toward higher-order passive harmonic mode-locking of a soliton fiber laser
Chang Su Jun, Sun Young Choi, Fabian Rotermund, Byoung Yoon Kim, Dong-Il Yeom
We report >13??MHz/mW pump power efficiency in increasing the repetition rate of passive harmonic mode-locking by engineering the soliton pulse energy in Er fiber lasers incorporating carbon nanotube saturable absorber. Stable pulses with a ?5??GHz repetition rate and 40 dB of super-mode ... [Opt. Lett. 37, 1862-1864 (2012)]
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Nonlinear localized modes in Glauber?Fock photonic lattices
A. J. Martínez, U. Naether, A. Szameit, R. A. Vicencio
We study a nonlinear Glauber?Fock lattice and the conditions for the excitation of localized structures. We investigate the particular linear properties of these lattices, including linear localized modes. We investigate numerically nonlinear modes centered in each site of the lattice. We ... [Opt. Lett. 37, 1865-1867 (2012)]
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Derivative method for phase retrieval in off-axis quantitative phase imaging
Basanta Bhaduri, Gabriel Popescu
We present a method for phase retrieval in off-axis interferometric systems. By numerically calculating the transverse 1st and 2nd order derivatives of the interferogram, we show that one can directly retrieve the quantitative phase image, without the need for Fourier or Hilbert transformations. ... [Opt. Lett. 37, 1868-1870 (2012)]
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