The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

Denise M. Krol - One of the best experts on this subject based on the ideXlab platform.

  • femtosecond laser writing of waveguides in zinc phosphate Glasses invited
    Optical Materials Express, 2011
    Co-Authors: L B Fletcher, Jonathan J Witcher, Neil Troy, Signo Tadeu Dos Reis, Richard K Brow, Rebeca Martinez Vazquez, Roberto Osellame, Denise M. Krol
    Abstract:

    We have studied the relationship between the initial Glass Composition and the structural changes associated with laser-induced refractive index modification in a series of Er-Yb doped and undoped zinc phosphate Glasses. White light microscopy and waveguide experiments are used together with Raman and fluorescence spectroscopy to characterize the structural changes. The correlation between Raman peak shifts and fluorescence from phosphorus–oxygen hole center (POHC) defects indicates that fs-laser writing results in a depolymerization of the phosphate Glass network. The results also show that the exact Glass Composition should be taken into account when fabricating waveguide devices in phosphate Glasses, in order to both expand the fs-laser processing conditions and maximize favorable morphological changes for 3-D photonic devices.

  • direct femtosecond laser waveguide writing inside zinc phosphate Glass
    Optics Express, 2011
    Co-Authors: L B Fletcher, Jonathan J Witcher, Neil Troy, Signo Tadeu Dos Reis, Richard K Brow, Denise M. Krol
    Abstract:

    We report the relationship between the initial Glass Composition and the resulting microstructural changes after direct femtosecond laser waveguide writing with a 1 kHz repetition rate Ti:sapphire laser system. A zinc polyphosphate Glass Composition with an oxygen to phosphorus ratio of 3.25 has demonstrated positive refractive index changes induced inside the focal volume of a focusing microscope objective for laser pulse energies that can achieve intensities above the modification threshold. The permanent photo-induced changes can be used for direct fabrication of optical waveguides using single scan writing techniques. Changes to the localized Glass network structure that produce positive changes in the refractive index of zinc phosphate Glasses upon femtosecond laser irradiation have been studied using scanning confocal micro-Raman and fluorescence spectroscopy.

  • Fs-laser fabrication of photonic structures in Glass: the role of Glass Composition
    2004
    Co-Authors: Denise M. Krol, James W. Chan, Thomas R Huser, Subhash H. Risbud, Joseph S. Hayden
    Abstract:

    The use of fs lasers to directly write phonic structures inside a Glass has great potential as a fabrication method for three-dimensional all-optical integrated components. The ability to use this technique with different Glass Compositions --specifically tailored for a specific photonics application -- is critical to its successful exploitation. Consequently, it is important to understand how Glass Composition effects waveguide fabrication with fs laser pulses and how different Glasses are structurally modified after exposure to fs laser pulses. We have used confocal laser spectroscopy to monitor the changes in Glass structure that are associated with waveguide fabrication. Using a low power continuous wave (cw) Ar laser as excitation source we have measured both Raman and fluorescence spectra of the modified regions. Raman spectroscopy provides us with information on the network structure, whereas fluorescence measurements reveal the presence of optically active point defects in the Glass. In this paper we review our work on fs-laser fabrication and characterization of photonic structures in Glass and discuss the effect of Glass Composition on processing parameters and structural modification.© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

L B Fletcher - One of the best experts on this subject based on the ideXlab platform.

  • femtosecond laser writing of waveguides in zinc phosphate Glasses invited
    Optical Materials Express, 2011
    Co-Authors: L B Fletcher, Jonathan J Witcher, Neil Troy, Signo Tadeu Dos Reis, Richard K Brow, Rebeca Martinez Vazquez, Roberto Osellame, Denise M. Krol
    Abstract:

    We have studied the relationship between the initial Glass Composition and the structural changes associated with laser-induced refractive index modification in a series of Er-Yb doped and undoped zinc phosphate Glasses. White light microscopy and waveguide experiments are used together with Raman and fluorescence spectroscopy to characterize the structural changes. The correlation between Raman peak shifts and fluorescence from phosphorus–oxygen hole center (POHC) defects indicates that fs-laser writing results in a depolymerization of the phosphate Glass network. The results also show that the exact Glass Composition should be taken into account when fabricating waveguide devices in phosphate Glasses, in order to both expand the fs-laser processing conditions and maximize favorable morphological changes for 3-D photonic devices.

  • direct femtosecond laser waveguide writing inside zinc phosphate Glass
    Optics Express, 2011
    Co-Authors: L B Fletcher, Jonathan J Witcher, Neil Troy, Signo Tadeu Dos Reis, Richard K Brow, Denise M. Krol
    Abstract:

    We report the relationship between the initial Glass Composition and the resulting microstructural changes after direct femtosecond laser waveguide writing with a 1 kHz repetition rate Ti:sapphire laser system. A zinc polyphosphate Glass Composition with an oxygen to phosphorus ratio of 3.25 has demonstrated positive refractive index changes induced inside the focal volume of a focusing microscope objective for laser pulse energies that can achieve intensities above the modification threshold. The permanent photo-induced changes can be used for direct fabrication of optical waveguides using single scan writing techniques. Changes to the localized Glass network structure that produce positive changes in the refractive index of zinc phosphate Glasses upon femtosecond laser irradiation have been studied using scanning confocal micro-Raman and fluorescence spectroscopy.

J. Solis - One of the best experts on this subject based on the ideXlab platform.

  • high efficiency waveguide optical amplifiers and lasers via fs laser induced local modification of the Glass Composition
    Journal of Lightwave Technology, 2017
    Co-Authors: J. Hoyo, P. Fernandez, Pedro Morenozarate, Geman Escalante, Juan A Valles, J. Solis
    Abstract:

    FS-laser irradiation at high repetition pulse rate enables producing high-performance passive waveguides in different Glasses through the local modification of the Glass Composition. In this paper, we show that this mechanism can similarly be used to produce high-performance waveguide amplifiers and lasers. Furthermore, we show the feasibility of producing active waveguides with different optical gains in the same phosphate Glass sample by changing the laser writing parameters. The lanthanides present in the Glass Composition (Er3+, Yb3+ , and La3+, the refractive index carrying element ) experience similar local concentration changes upon fs-laser writing, enabling to determine the concentration of La3+ and thus the refractive index contrast of the guiding region by measuring its absorption at 1534 nm. The produced waveguide lasers show slope efficiencies (respect to the absorbed pump power) above 38%, which could reach up to 42% by further optimization of the waveguide laser cavity configuration. The active waveguides produced are thermally stable for temperatures up to at least 450 °C.

  • Femtosecond-laser inscription via local modification of the Glass Composition in phosphate Glasses
    2014 Conference on Lasers and Electro-Optics (CLEO) - Laser Science to Photonic Applications, 2014
    Co-Authors: J. Hoyo, B. Sotillo, J. Siegel, Toney T. Fernandez, P. Fernandez, P. Haro-gonzález, D. Jaque, M. Hernandez, C. Domingo, J. Solis
    Abstract:

    Femtosecond laser inscription of high performance active/passive waveguides is demonstrated in phosphate Glass via local modification of the Glass Composition. La-K cross diffusion plays a key role in the performance of the generated structures.

  • ion migration assisted inscription of high refractive index contrast waveguides by femtosecond laser pulses in phosphate Glass
    Optics Letters, 2013
    Co-Authors: T T Fernandez, J. Siegel, P. Fernandez, D. Jaque, C. Domingo, P Harogonzalez, Belen Sotillo, Maria Jose Quintana Hernandez, J. Solis
    Abstract:

    In this Letter, we report on the successful fabrication of low loss, high refractive index contrast waveguides via ion migration upon femtosecond laser writing in phosphate Glass. Waveguides were produced in two different phosphate Glass Compositions with high and low La2O3 content. In the La-rich Glass, a large refractive index increase in the guiding region was observed due to the incoming migration of La accompanied by the out-diffusion of K. The much smaller refractive index change in the La-less Glass is caused by rearrangements of the Glass structure. These results confirm the feasibility of adapting the Glass Composition for enabling the laser writing of high refractive index contrast structures via spatially selective modification of the Glass Composition.

Signo Tadeu Dos Reis - One of the best experts on this subject based on the ideXlab platform.

  • femtosecond laser writing of waveguides in zinc phosphate Glasses invited
    Optical Materials Express, 2011
    Co-Authors: L B Fletcher, Jonathan J Witcher, Neil Troy, Signo Tadeu Dos Reis, Richard K Brow, Rebeca Martinez Vazquez, Roberto Osellame, Denise M. Krol
    Abstract:

    We have studied the relationship between the initial Glass Composition and the structural changes associated with laser-induced refractive index modification in a series of Er-Yb doped and undoped zinc phosphate Glasses. White light microscopy and waveguide experiments are used together with Raman and fluorescence spectroscopy to characterize the structural changes. The correlation between Raman peak shifts and fluorescence from phosphorus–oxygen hole center (POHC) defects indicates that fs-laser writing results in a depolymerization of the phosphate Glass network. The results also show that the exact Glass Composition should be taken into account when fabricating waveguide devices in phosphate Glasses, in order to both expand the fs-laser processing conditions and maximize favorable morphological changes for 3-D photonic devices.

  • direct femtosecond laser waveguide writing inside zinc phosphate Glass
    Optics Express, 2011
    Co-Authors: L B Fletcher, Jonathan J Witcher, Neil Troy, Signo Tadeu Dos Reis, Richard K Brow, Denise M. Krol
    Abstract:

    We report the relationship between the initial Glass Composition and the resulting microstructural changes after direct femtosecond laser waveguide writing with a 1 kHz repetition rate Ti:sapphire laser system. A zinc polyphosphate Glass Composition with an oxygen to phosphorus ratio of 3.25 has demonstrated positive refractive index changes induced inside the focal volume of a focusing microscope objective for laser pulse energies that can achieve intensities above the modification threshold. The permanent photo-induced changes can be used for direct fabrication of optical waveguides using single scan writing techniques. Changes to the localized Glass network structure that produce positive changes in the refractive index of zinc phosphate Glasses upon femtosecond laser irradiation have been studied using scanning confocal micro-Raman and fluorescence spectroscopy.

Richard K Brow - One of the best experts on this subject based on the ideXlab platform.

  • femtosecond laser writing of waveguides in zinc phosphate Glasses invited
    Optical Materials Express, 2011
    Co-Authors: L B Fletcher, Jonathan J Witcher, Neil Troy, Signo Tadeu Dos Reis, Richard K Brow, Rebeca Martinez Vazquez, Roberto Osellame, Denise M. Krol
    Abstract:

    We have studied the relationship between the initial Glass Composition and the structural changes associated with laser-induced refractive index modification in a series of Er-Yb doped and undoped zinc phosphate Glasses. White light microscopy and waveguide experiments are used together with Raman and fluorescence spectroscopy to characterize the structural changes. The correlation between Raman peak shifts and fluorescence from phosphorus–oxygen hole center (POHC) defects indicates that fs-laser writing results in a depolymerization of the phosphate Glass network. The results also show that the exact Glass Composition should be taken into account when fabricating waveguide devices in phosphate Glasses, in order to both expand the fs-laser processing conditions and maximize favorable morphological changes for 3-D photonic devices.

  • direct femtosecond laser waveguide writing inside zinc phosphate Glass
    Optics Express, 2011
    Co-Authors: L B Fletcher, Jonathan J Witcher, Neil Troy, Signo Tadeu Dos Reis, Richard K Brow, Denise M. Krol
    Abstract:

    We report the relationship between the initial Glass Composition and the resulting microstructural changes after direct femtosecond laser waveguide writing with a 1 kHz repetition rate Ti:sapphire laser system. A zinc polyphosphate Glass Composition with an oxygen to phosphorus ratio of 3.25 has demonstrated positive refractive index changes induced inside the focal volume of a focusing microscope objective for laser pulse energies that can achieve intensities above the modification threshold. The permanent photo-induced changes can be used for direct fabrication of optical waveguides using single scan writing techniques. Changes to the localized Glass network structure that produce positive changes in the refractive index of zinc phosphate Glasses upon femtosecond laser irradiation have been studied using scanning confocal micro-Raman and fluorescence spectroscopy.