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  1. Article

    Open Access

    Anti-esca** of incident laser in rare-earth doped fluoride ceramics with glass forming layer

    Adaptive fluoride ceramic with glass forming layer (GCZBL-Er) used in laser anti-esca** has been prepared by one-step synthesis, and the thickness of glass layer is identified as ~0.41 mm. Blue, green and red e...

    H. F. Shi, P. J. Lin, J. X. Yang, J. L. Yuan, E. Y. B. Pun, Y. Song… in Scientific Reports (2019)

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  2. No Access

    Article

    Gain anticipation of Ho3+ in ion-exchangeable germanate waveguide glasses

    Efficient infrared emissions at ~ 1.2 and ~ 2.0 µm were recorded in Ho3+-single-doped and Ho3+/Yb3+-co-doped aluminum germanate glasses (NMAG), respectively. The maximum stimulated emission cross-sections for the...

    B. J. Chen, J. X. Yang, E. Y. B. Pun, X. Zhao, H. Lin in Applied Physics B (2018)

  3. No Access

    Article

    Upconversion photon quantification of holmium and erbium ions in waveguide-adaptive germanate glasses

    Visible upconversion photons have been quantified precisely in Ho3+/Yb3+ and Er3+/Yb3+ doped waveguide-adaptive aluminum germanate (NMAG) glasses, and effective red and green upconversion emissions generated from...

    C. L. Zhu, E. Y. B. Pun, Z. Q. Wang, H. Lin in Applied Physics B (2017)

  4. No Access

    Article

    Influence of Li-rich vapor transport equilibration on surface refractive index and Mg concentration of MgO (5 mol%)-doped LiNbO3 crystal

    The Li-rich vapor transport equilibration (VTE) effect on surface refractive index of MgO (5 mol%)-doped LiNbO3 crystal is studied at the wavelengths of 473, 632.8 and 1536 nm. The results show that in the early ...

    D.-L. Zhang, B. Chen, L. Qi, P.-R. Hua, Y.-M. Cui, D.-Y. Yu… in Applied Physics B (2011)

  5. No Access

    Article

    Transient characteristics of green upconversion emission of Er3+ in MgO:LiNbO3 crystal: Mg threshold concentration effect

    Transient characteristics of upconverted emission (560 nm) of Er3+ in LiNbO3 crystals codoped with 0–7.4 mol% MgO were studied under pulse excitation at 800-nm wavelength. The results show that the transients dis...

    D.-L. Zhang, C. Wu, Q.-Z. Yang, L. Sun, Y.-H. Xu, E. Y. B. Pun in Applied Physics B (2009)

  6. No Access

    Article

    Research on the influence of fabrication parameters on the performance of buried ion-exchanged glass waveguides using the variational method

    The variational method is proposed to analyze the influence of the fabrication parameters on the performance of buried K+–Na+ ion-exchanged Er3+–Yb3+ ions co-doped glass waveguide. The unknown parameters of the H...

    Ya Li Zhang, Ning Hua Zhu, Ji Min Wen, E. Y. B. Pun… in Optical and Quantum Electronics (2007)

  7. No Access

    Article

    X-ray diffraction, optical absorption and emission studies on Er3+- and Er3+/Yb3+-doped Li3NbO4 powder

    Er3+(/Yb3+)-doped Li3NbO4 powder were prepared by thermally sintering mixtures of Er2O3 (0.5, 1.0 mol%), Yb2O3 (0, 0.5, 1.0 mol%), Li2CO3 (48–49 mol%) and Nb2O5 (50 mol%) at 1125, 1150 and 1450 °C over the durati...

    De-Long Zhang, Jia Kang, E. Y. B. Pun in Journal of Materials Science (2007)

  8. No Access

    Article

    High-Q filters based on one-dimensional photonic crystals using epsilon-negative materials

    A new type of filter based on one-dimensional photonic crystals is presented. A photonic crystal consists of a periodic repetition of air layers and epsilon-negative (ENG) material layers. This type of filter ...

    Y.-T. Fang, J. Zhou, E.Y.B. Pun in Applied Physics B (2007)

  9. No Access

    Article

    Light-induced absorption in reduced congruent and near-stoichiometric Er:LiNbO3 crystals

    Light-induced absorption (LIA) in thermally reduced congruent and near-stoichiometric Er:LiNbO3 crystals, which have different cuts of crystal (X- and Y-cut) and different do** levels of Er3+ (0.2, 0.4, 0.6 and...

    D.-L. Zhang, J. Zhang, Z.-K. Wu, E.Y.B. Pun in Applied Physics A (2006)

  10. No Access

    Article

    Raman scattering study of reduced Er:LiNbO3 crystals

    Raman spectra of as-grown and reduced (or annealed) Er:LiNbO3 crystals, which have different cut orientations, varied Li/Nb ratio, and different Er-do** levels of 0.2, 0.4, 0.6, 1.0, and 2.0 mol%, were recorded...

    D.L. Zhang, J. Zhang, Y.F. Wang, E.Y.B. Pun in Applied Physics A (2005)

  11. No Access

    Article

    Frequency Bandwidth Estimation of TO Packaging Techniques for Laser Modules

    Two simple methods for estimating the potential modulation bandwidth of TO packaging technique are presented. The first method is based upon the comparison of the measured frequency responses of the laser diod...

    N. H. Zhu, Y. L. Wang, C. Qian, E. Y. B. Pun… in Optical and Quantum Electronics (2005)

  12. No Access

    Article

    Light-induced absorption instability in weakly reduced congruent Er:LiNbO3 crystal

    Light-induced absorption (LIA) characteristics in weakly reduced (or strongly annealed) congruent and/or vapor transport equilibration (VTE)-treated Er-doped LiNbO3 crystals have been investigated in comparison w...

    D.-L. Zhang, J. Zhang, Y.-F. Wang, D.-S. Zhu, Z.-K. Wu, E.Y.B. Pun in Applied Physics A (2005)

  13. No Access

    Article

    Polymeric optical waveguides using direct ultraviolet photolithography process

    Single-mode polymeric channel waveguides were fabricated using simple direct ultraviolet photolithography process. A cross-linkable negative tone epoxy NANOTM SU-8 2000 polymer was used. Once exposed to ultraviol...

    K.K. Tung, W.H. Wong, E.Y.B. Pun in Applied Physics A (2005)

  14. No Access

    Article

    Long period polymer waveguide grating device with positive temperature sensitivity

    A long-period waveguide grating (LPWG) was demonstrated in a low-loss negative tone UV-sensitive epoxy novolak resin polymer. The grating structure was fabricated on top of the waveguide using a standard UV li...

    H.Y. Tang, W.H. Wong, E.Y.B. Pun in Applied Physics B (2004)

  15. No Access

    Article

    Design of flat-field arrayed waveguide grating with three stigmatic points

    A new-type flat-field arrayed waveguide grating (AWG), with the focal signals of all wavelengths of operation focusing along a straight line, has been designed. The work bases on the aberration theory of AWG, ...

    S. Lu, W.H. Wong, E.Y.B. Pun, Y. Yan, D. Wang, D. Yi… in Optical and Quantum Electronics (2003)

  16. No Access

    Article

    Scattering-parameter measurements of laser diodes

    An accurate and simple technique for measuring the input reflection coefficient and the frequency response of semiconductor laser diode chips is proposed and demonstrated. All the packaging parasitics could be...

    N.H. Zhu, Y. Liu, E.Y.B. Pun, P.S. Chung in Optical and Quantum Electronics (2002)

  17. No Access

    Article

    Protective AlZrN film for organic photoconductors

    AlZrN protective film with high transmissivity was deposited onto the organic photoconductor (OPC) surface, and the surface hardness was greatly increased by a factor of 1.5–3. The OPC surface protected by (Al100...

    Y. C. Chan, X. S. Miao, E. Y. B. Pun in Journal of Materials Research (1998)

  18. No Access

    Chapter

    PZT Thin Films by Radio Frequency Magnetron Sputtering

    Pb(ZrxT1-x)O3 (or PZT) thin films have been deposited on [110] LiTaO3 single crystal substrates by radio frequency magnetron sputtering using a ceramic target with excess PbO. Highly oriented [101] PZT thin films...

    D. X. Lu, E. M. W. Wong, E. Y. B. Pun, P. S. Chung… in Applications of Photonic Technology 2 (1997)

  19. No Access

    Article

    Optical Waveguides in Thermally Grown SiO2 on Si Using Nitrogen Ion Implantation

    Multi-energy nitrogen implantation into thermally grown SiO2 on silicon substrates has been performed and the optical wave-guiding properties of this structure has been studied. The implantation energy used was i...

    S. P. Wong, E. Y. B. Pun, W. T. Lam, P. S. Chung in MRS Online Proceedings Library (1991)