The Experts below are selected from a list of 594 Experts worldwide ranked by ideXlab platform

Jan Masajada - One of the best experts on this subject based on the ideXlab platform.

  • Optical vortex trajectory as a merit function for spatial light modulator correction
    Optics and Lasers in Engineering, 2019
    Co-Authors: Mateusz Szatkowski, Agnieszka Popiołek Masajada, Jan Masajada
    Abstract:

    Abstract Spatial light modulator (SLM) is a modern device extensively used for laser beam shaping. Over the years, its quality has been significantly improved. Nevertheless, there is still a need to correct its imperfections. In this paper we propose two criteria which allow to examine correction effectiveness of SLM. One is based on the Laguerre–Gauss transform and the second uses optical vortex dynamics which exposes a high sensitivity to any beam imperfections. It is based on the vortex Internal Scanning method, where the shape of vortex trajectory provides information about SLM correction quality. In this paper we test its sensitivity to astigmatism, which was introduced manually by SLM, after proper correction.

  • Internal Scanning method as unique imaging method of optical vortex Scanning microscope
    Optics and Lasers in Engineering, 2018
    Co-Authors: Agnieszka Popiołek-masajada, Jan Masajada, Mateusz Szatkowski
    Abstract:

    Abstract The Internal Scanning method is specific for the optical vortex microscope. It allows to move the vortex point inside the focused vortex beam with nanometer resolution while the whole beam stays in place. Thus the sample illuminated by the focused vortex beam can be scanned just by the vortex point. We show that this method enables high resolution imaging. The paper presents the preliminary experimental results obtained with the first basic image recovery procedure. A prospect of developing more powerful tools for topography recovery with the optical vortex Scanning microscope is discussed shortly.

  • The Internal Scanning method with optical vortex interferometer
    Lasers and Applications, 2005
    Co-Authors: Jan Masajada
    Abstract:

    The optical vortex interferometer (OVI) is new optical instrument based on the regular net of optical vortices. Such net is generated by interference of three plane waves. In this paper the phase shifting method named Internal Scanning method, which enhances the OVI possibilities is discussed. The possible applications of this new method are also presented in brief.

Mateusz Szatkowski - One of the best experts on this subject based on the ideXlab platform.

  • Optical vortex trajectory as a merit function for spatial light modulator correction
    Optics and Lasers in Engineering, 2019
    Co-Authors: Mateusz Szatkowski, Agnieszka Popiołek Masajada, Jan Masajada
    Abstract:

    Abstract Spatial light modulator (SLM) is a modern device extensively used for laser beam shaping. Over the years, its quality has been significantly improved. Nevertheless, there is still a need to correct its imperfections. In this paper we propose two criteria which allow to examine correction effectiveness of SLM. One is based on the Laguerre–Gauss transform and the second uses optical vortex dynamics which exposes a high sensitivity to any beam imperfections. It is based on the vortex Internal Scanning method, where the shape of vortex trajectory provides information about SLM correction quality. In this paper we test its sensitivity to astigmatism, which was introduced manually by SLM, after proper correction.

  • Internal Scanning method as unique imaging method of optical vortex Scanning microscope
    Optics and Lasers in Engineering, 2018
    Co-Authors: Agnieszka Popiołek-masajada, Jan Masajada, Mateusz Szatkowski
    Abstract:

    Abstract The Internal Scanning method is specific for the optical vortex microscope. It allows to move the vortex point inside the focused vortex beam with nanometer resolution while the whole beam stays in place. Thus the sample illuminated by the focused vortex beam can be scanned just by the vortex point. We show that this method enables high resolution imaging. The paper presents the preliminary experimental results obtained with the first basic image recovery procedure. A prospect of developing more powerful tools for topography recovery with the optical vortex Scanning microscope is discussed shortly.

Agnieszka Popiołek-masajada - One of the best experts on this subject based on the ideXlab platform.

  • Internal Scanning method as unique imaging method of optical vortex Scanning microscope
    Optics and Lasers in Engineering, 2018
    Co-Authors: Agnieszka Popiołek-masajada, Jan Masajada, Mateusz Szatkowski
    Abstract:

    Abstract The Internal Scanning method is specific for the optical vortex microscope. It allows to move the vortex point inside the focused vortex beam with nanometer resolution while the whole beam stays in place. Thus the sample illuminated by the focused vortex beam can be scanned just by the vortex point. We show that this method enables high resolution imaging. The paper presents the preliminary experimental results obtained with the first basic image recovery procedure. A prospect of developing more powerful tools for topography recovery with the optical vortex Scanning microscope is discussed shortly.

Paloma Bilbao Calabuig - One of the best experts on this subject based on the ideXlab platform.

  • The impact of electronic commerce on small and midsized spanish companies
    International Advances in Economic Research, 2001
    Co-Authors: M. Yolanda Fernández Jurado, Paloma Bilbao Calabuig
    Abstract:

    Electronic commerce (EC) is not new for some European Union countries, but in others, such as Spain, it is only at the developmental stage. Now that Spain has joined the third phase of the economic and monetary union, Spanish companies' internationalization and the progressive change in the Spanish consumers' buying habits are determining the search for new business strategies. Starting with an analysis of the Spanish business environment, followed by an Internal Scanning of small and midsized Spanish companies, this paper will analyze the viability of EC as a new business strategy.

  • The impact of electronic commerce on small and midsized spanish companies
    International Advances in Economic Research, 2001
    Co-Authors: M. Yolanda Fernández Jurado, Paloma Bilbao Calabuig
    Abstract:

    Electronic commerce (EC) is not new for some European Union countries, but in others, such as Spain, it is only at the developmental stage. Now that Spain has joined the third phase of the economic and monetary union, Spanish companies' internationalization and the progressive change in the Spanish consumers' buying habits are determining the search for new business strategies. Starting with an analysis of the Spanish business environment, followed by an Internal Scanning of small and midsized Spanish companies, this paper will analyze the viability of EC as a new business strategy. Copyright International Atlantic Economic Society 2001

K. P. Whittall - One of the best experts on this subject based on the ideXlab platform.

  • Proton magnetic resonance techniques for characterization of water in wood: application to white spruce
    Wood Science and Technology, 1992
    Co-Authors: C. D. Araujo, A. L. Mackay, J. R. T. Hailey, K. P. Whittall
    Abstract:

    Two new proton magnetic resonance techniques, relaxation spectra and relaxation selective imaging, have been used to investigate the distribution of water in samples of normal white spruce sapwood, heartwood, and juvenile wood as well as two rehydrated heartwood samples containing incipient decay and compression wood respectively. It is demonstrated that the spin-spin (T_2) relaxation behavior in wood is best presented as a continuous spectrum of relaxation times. Spectra of T_2 for white spruce show separate peaks corresponding to the different water environments. Bound water gives a peak with an T_2 time of about 1 ms and lumen water gives a distribution of T_2 times in the range of 10 to 100 ms. The lumen water T_2 time is a function of the wood cell radius. Consequently, the different cell lumen radii distributions for spruce sapwood, juvenile wood, and compression wood are readily distinguishable by the shape of their T_2 spectra. Water environments which are separable on a T_2 spectrum may be imaged separately. Imaging has been carried out in one dimension for bound water and lumen water of a spruce sapwood sample at four different moisture contents ranging from 100% to 17%. For the first time, we demonstrate that above the fibre saturation point the moisture density profile of the bound water is largely independent of moisture content. The feasibility and utility of using these techniques for Internal Scanning of logs and lumber is discussed. These techniques should provide new insights into the wood drying process.