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Record 325 of
Title:Kinetics of polarization gratings assisted with polarized violet light in bacteriorhodopsin films
Author(s):Yu, Xianghua(1); Gao, Peng(1); Yao, Baoli(1); Lei, Ming(1); Rupp, Romano(2)
Source: Journal of the Optical Society of America A: Optics and Image Science, and Vision Volume: 30 Issue: 9 DOI: 10.1364/JOSAA.30.001885 Published: September 1, 2013
Abstract:Polarization gratings can be recorded in bacteriorhodopsin films by an orthogonal pair of linearly or circularly polarized beams. If a linearly polarized auxiliary violet light is added during the grating formation, the grating becomes polarization-sensitive. A theoretical model based on the two-state photochromic theory is proposed to calculate the diffraction efficiency kinetics of these polarization gratings. In both cases, the additional linearly polarized auxiliary violet irradiation improves the steady-state diffraction efficiency and leads to a cosine modulation of the steady-state diffraction efficiency by the polarization orientation of the readout beam. Experiment results demonstrate the correctness of the theoretical model. ? 2013 Optical Society of America.
Accession Number: 20134016796142
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Record 326 of
Title:Spectroscopic and laser-induced damage properties of Fe2+-doped fluorophosphate glass, a new color-separation material
Author(s):Fu, Lili(1,2); Ren, Wenyi(2); Liu, Chunxiao(1); Xu, Shennuo(1); Zheng, Ruilin(3); Wei, Wei(1,3); Zhang, Chunmin(2); Peng, Bo(1)
Source: Applied Physics B: Lasers and Optics Volume: 113 Issue: 1 DOI: 10.1007/s00340-013-5652-6 Published: October 2013
Abstract:Fe2+-doped fluorophosphate glass (FEFG), a new color-separation material, is prepared by a melt-quenching method. The spectroscopic and laser-induced damage (LID) properties of FEFG are investigated by transmittance spectroscopy, LID tests, scanning electron microscopy, and Raman spectroscopy. Results show that the sample has intensive absorption (>85 %) at 1,053 nm and high transmittance (~86.5 %) at 351 nm after introducing 0.3 wt% Fe 2O3. The LID thresholds of 0.3 wt% Fe2O 3-doped FEFG sample irradiated by 351- and 1,053-nm lasers with 8 ns pulse width are 4.5 and 36.0 J/cm2, respectively. Thus, FEFG has laser-separation ability and can resist nanosecond laser irradiation, indicating that FEFG is a potential color-separation material for high-power lasers. ? 2013 Springer-Verlag Berlin Heidelberg.
Accession Number: 20135017088718
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Record 327 of
Title:Visible and near-infrared optical properties of chalcogenide glass waveguides formed by swift Kr ion irradiation
Author(s):Liu, Tao(1); Liu, Chun-Xiao(2); Guo, Hai-Tao(2); Huang, Qing(1); Liu, Peng(1); Guo, Sha-Sha(1); Zhang, Lian(1); Zhou, Yu-Fan(1); Sun, Jian-Rong(3); Wang, Zhi-Guang(3); Wang, Xue-Lin(1)
Source: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms Volume: 314 Issue: DOI: 10.1016/j.nimb.2013.04.066 Published: 2013
Abstract:Planar waveguide structures in chalcogenide glass were fabricated with 17 MeV or 150 MeV swift Kr ion irradiation. Images of the polished end faces of the Kr-irradiated chalcogenide glass were measured with a metallographic microscope using reflected polarized light. SRIM 2010 was used to simulate the electronic and nuclear stopping powers for swift Kr ion irradiation. The micro-Raman spectra were measured in air. The near-field intensity distributions were investigated at visible (633 nm) and near-infrared (1300 nm, 1500 nm, 1539 nm and 1620 nm) bands. These intensity distributions make the waveguide candidates for infrared laser devices. The estimated propagation loss of the waveguide fabricated by 150 MeV swift Kr ion irradiation was approximately 4 dB/cm at a wavelength of 633 nm. ? 2013 Elsevier B.V. All rights reserved.
Accession Number: 20134416936039
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Record 328 of
Title:A photocatalytic reactor derived from microstructured polymer optical fiber preform
Author(s):Li, Dongdong(1,2); Wang, Lili(2); Zhang, Gongjian(3)
Source: Optics Communications Volume: 286 Issue: 1 DOI: 10.1016/j.optcom.2012.08.092 Published: January 1, 2013
Abstract:This paper reports a novel photocatalytic reactor having 547 pieces of TiO2 nanocrystal-film-modified capillaries, which is derived from a microstructured polymer optical fiber (MPOF) preform. The photocatalytic active TiO2 nanocrystal film is obtained by microwave processing of the TiO2 gel films in the MPOF preform. The MPOF preform not only plays a role as a light-transmitting media, also a TiO2 supporting and waste-water pipe to supply for photocatalytic degradation of toxic organic solute. The photocatalytic reactor has so large surface area for TiO2 loading that photodegradation efficiency is enhanced. As far as we know, the photocatalytic reactor based on the super-multi channels capillary waveguide arrays has not been reported before. ? 2012 Elsevier B.V. All rights reserved.
Accession Number: 20124515637915
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Record 329 of
Title:Two-photon fluorescence stereomicroscopy with bessel beams
Author(s):Yang, Yanlong(1); Lei, Ming(1); Zheng, Juanjuan(1); Li, Runze(1); Yan, Shaohui(1); Yao, Baoli(1); Ye, Tong(1,2)
Source: Progress in Biomedical Optics and Imaging - Proceedings of SPIE Volume: 8588 Issue: DOI: 10.1117/12.2002850 Published: 2013
Abstract:Three dimensional distributions of cells can be usually acquired by optical sectioning methods, such as multiphoton excitation and confocal fluorescence laser scanning microscopy. Though the lateral scan rates can reach up to several kHz, the relatively slow axial scan comprises the speed of real-time imaging of a volume. Here we propose a three dimensional imaging method that uses Bessel beams as excitation in multiphoton fluorescence microscopy. The extended focus of the Bessel beam allows recording a volume of cells without scanning the depth. The depth information can be retrieved by recording a pair of parallax views of the same volume. We have demonstrated the stereoscope capability on a homebuilt two-photon fluorescence microscope. ? 2013 SPIE.
Accession Number: 20132416417760
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Record 330 of
Title:Mid-infrared fluorotellurite glasses and fibers
Author(s):Zhan, Huan(1,2); Zhang, Aidong(1); He, Jianli(1,2); Zhou, Zhiguang(1); Li, Lu(1,2); Lin, Aoxiang(1)
Source: CLEO: QELS_Fundamental Science, CLEO:QELS FS 2013 Volume: Issue: DOI: Published: 2013
Abstract:We report on the fabrication and characterization of rare earth ions-doped water-free fluorotellurite glasses and fibers. For 2.8 mm glass fiber rods, its background loss was ~12 dB/m in the range of 2.5~4.2 μm. ? OSA 2013.
Accession Number: 20134717009975
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Record 331 of
Title:Mid-infrared fluorotellurite glasses and fibers
Author(s):Zhan, Huan(1,2); Zhang, Aidong(1); He, Jianli(1,2); Zhou, Zhiguang(1); Li, Lu(1,2); Lin, Aoxiang(1)
Source: CLEO: Science and Innovations, CLEO_SI 2013 Volume: Issue: DOI: Published: 2013
Abstract:We report on the fabrication and characterization of rare earth ions-doped water-free fluorotellurite glasses and fibers. For 2.8 mm glass fiber rods, its background loss was ~12 dB/m in the range of 2.5~4.2 μm. ? OSA 2013.
Accession Number: 20134716990012
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Record 332 of
Title:Graphene-based 2 μm Tm3+-doped fiber passively Q-switched laser
Author(s):Li, Diao(1); Jiang, Man(1); Qi, Mei(1); Zheng, Xin-Liang(1); Ren, Zhao-Yu(1); Sun, Zhi-Pei(2); Wang, Yi-Shan(3); Bai, Jin-Tao(1)
Source: Guangzi Xuebao/Acta Photonica Sinica Volume: 42 Issue: 8 DOI: 10.3788/gzxb20134208.0978 Published: August 2013
Abstract:The output characteristics of graphene-based passively Q-switched pulses at 2 μm wavelengths were reported. On the basis of linear resonant cavity, Tm3+-doped fiber and graphene saturable absorber mirror served as gain medium and passively Q-switched device respectively. Tm3+-doped fiber was end pumped by 792 nm semiconductor laser. Light in the cavity was focused onto graphene membrane through a set of collimation and focusing lens. Passively Q-switched pulses centered at 1 958 nm wavelength were acquired successfully. The minimum pulse width of 1.02 μs was obtained when pump power rise to 3.0 W, and corresponding average output power of 26 mW, repetition rate of 116 kHz, single pulse energy of 224 nJ were obtained respectively. Furthermore, average output power and pulse width presented approximate linear relationship with incident pump power. The experimental results indicate that excellent saturated absorption characteristic of graphene is effective for passively Q-switched pulse operation at 2 μm wavelengths.
Accession Number: 20134216860599
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Record 333 of
Title:Multiring large-mode-area delivery fiber for high power
Author(s):Li, Lu(1,2); Zhang, Aidong(1); Zhan, Huan(1,2); He, Jianli(1,2); Shi, Tengfei(1,2); Zhou, Zhiguang(1,2); Xiao, Xusheng(1,2); Lin, Aoxiang(1)
Source: Applied Optics Volume: 52 Issue: 31 DOI: 10.1364/AO.52.007407 Published: November 1, 2013
Abstract:The study presents a novel design of multiring delivery fiber with large mode area for high power. Using a FiberCAD method, we investigated a fiber whose core is surrounded by alternative low- and high-index rings. Based on our calculation, the effective area is 400 μm2 at 1.08 μm, larger than the ~280 μm2 of conventional step-index fiber (20/400). The macrobending loss at 1.08 μm is estimated to be 1 × 10-3 dB/m, approximately one-third that of conventional step-index fiber (20/400). The single-mode operation can be achieved by the macrobending loss contrast between the fundamental mode (100 dB/m). The results indicate that multiring delivery fiber fabricated by modified chemical vapor deposition process is a promising candidate for high-power transmission. ? 2013 Optical Societyof America.
Accession Number: 20134616972680
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Record 334 of
Title:Design and simulation of large-mode-area solid-core bragg fiber
Author(s):Li, Lu(1,2); Zhang, Aidong(1); Zhan, Huan(1,2); He, Jianli(1,2); Zhou, Zhiguang(1); Lin, Aoxiang(1)
Source: Asia Communications and Photonics Conference, ACP Volume: Issue: DOI: 10.1364/acpc.2013.af2d.15 Published: 2013
Abstract:Solid-core Bragg fiber was proposed as a competitive solution for high power laser delivery. The optimized fiber is with effective area of 400 μm2 and low loss of 3 dB/km at 1.08 μm. ? OSA 2013.
Accession Number: 20142017710731
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Record 335 of
Title:Localized surface waves at the interfzace between a linear dielectric and a photovoltaic-photorefractive crystal
Author(s):Li, Kehao(1,3); Lu, Keqing(1,3); Zhang, Yiqi(2); Niu, Pingjuan(3); Yu, Liyuan(3); Zhang, Yanpeng(4)
Source: Optics and Laser Technology Volume: 48 Issue: DOI: 10.1016/j.optlastec.2012.09.021 Published: 2013
Abstract:We study localized surface waves at the interface between a linear dielectric and a photovoltaic-photorefractive (PP) crystal. These localized surface waves can be established provided that 0>δ-b>-α/2, where δ is the guiding parameter, b is the propagation constant, and α is the parameter related to the wavelength and the PP crystal. We show that when δ>0, the part of the energy concentrated in the PP crystal is always higher than that in the linear dielectric and that when δ0. Crown Copyright ? 2012 Published by Elsevier Ltd. All rights reserved.
Accession Number: 20130215877006
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Record 336 of
Title:Investigation of Bessel beam propagation in scattering media with scalar diffraction method
Author(s):Zheng, Juanjuan(1); Yao, Baoli(1); Yang, Yanlong(1); Lei, Ming(1); Gao, Peng(1); Li, Runze(1); Yan, Shaohui(1); Dan, Dan(1); Ye, Tong(1,2)
Source: Chinese Optics Letters Volume: 11 Issue: 11 DOI: 10.3788/COL201311.112601 Published: November 2013
Abstract:Bessel beam propagation in scattering media is simulated using the angular spectrum method combined with slice-by-slice propagation model. Generating Bessel beams with a spatial light modulator, which provides a means to adjust flexibly the parameters of the Bessel beam, allows us to validate the simulation results experimentally. The study reveals that the self-reconstructing length changes oppositely with the axicon angle (i.e., the larger the axicon angle, the shorter the self-reconstructing length). The radius of the incident beam has little influence on the self-reconstruction of the Bessel beam central lobe. ? 2013 Chinese Optics Letters.
Accession Number: 20141017419588
