The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform

A. H. Kung - One of the best experts on this subject based on the ideXlab platform.

Yulian Vysochanskii - One of the best experts on this subject based on the ideXlab platform.

  • self pumped optical phase conjugation at 1 06 μm in te doped sn 2 p 2 s 6
    Optics Express, 2005
    Co-Authors: Tobias Bach, P. Gunter, Mojca Jazbinsek, Alexander A Grabar, I M Stoika, Yulian Vysochanskii
    Abstract:

    We demonstrate self-pumped optical phase conjugation in Te-doped Sn2P2S6, a semiconducting Ferroelectric Crystal, using a 1.06 μm wavelength cw Nd:YAG laser. The photorefractive gain of this Crystal has been increased to Γ = (3.9 ± 0.4)cm-1 by Te doping. We observed self-pumped optical phase conjugation in a ring cavity scheme with phase conjugate reflectivities of more than 40 percent and a very fast phase conjugate rise time below 100ms at a light intensity of 20 W/cm2. This is more than two orders of magnitude faster than in any other photorefractive Crystal, as e.g. in Rh-doped BaTiO3.

Lung-han Peng - One of the best experts on this subject based on the ideXlab platform.

  • generation of multi octave spanning laser harmonics by cascaded quasi phase matching in a monolithic Ferroelectric Crystal
    Optics Letters, 2009
    Co-Authors: Lung-han Peng, A. H. Kung
    Abstract:

    We report the generation of the second to the sixth harmonics of a fundamental frequency covering two and a half octaves in a multiply-periodically poled lithium tantalate Crystal by cascaded quasi-phase-matched frequency mixing. A frequency comb that is composed of these harmonics will permit the synthesis of a train of periodic subcycle subfemtosecond pulses in a compact setting.

  • Polarization switching of Ferroelectric Crystals
    Handbook of Thin Films, 2007
    Co-Authors: Lung-han Peng
    Abstract:

    Publisher Summary The Ferroelectric Crystal is defined as a Crystal belonging to the pyroelectric family upon which the direction of its homogeneous spontaneous polarization vector P s is subjected to a temperature change. The process leading to the reorientation of all Ferroelectric domains in one polarization direction is called “poling,” “polarization switching,” or “domain reversal.” This chapter reviews technical development in the fields of data storage and optoelectronics. The chapter discusses the methods that lead to the construction of (1) single domain Crystal and (2) layered structures with spontaneous polarization P s anti-parallel or opposite to each other. The ability of a Ferroelectric Crystal to switch between its polarization states and to make a small area of reversed domains with fast switching has made Ferroelectrics attractive for applications in gigabyte data storage. The emergent applications of using Ferroelectric thin films and Crystals for the high-density memory and storage and highly efficient linear and nonlinear optoelectronic devices have had a great impact on the research and technical development of Ferroelectric domain reversal techniques over the past decades.

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

  • Photorefractive two-wave mixing in Sn2P2S6:Te at 1.55 μm
    2008 Conference on Lasers and Electro-Optics and 2008 Conference on Quantum Electronics and Laser Science, 2008
    Co-Authors: R. Mosimann, P. Marty, M. Jazbinsek, P. Gunter, A. A. Grabar
    Abstract:

    We demonstrate fast photorefractive two-wave mixing with a cw-laser at the telecommunication wavelength 1.55 mum for the first time in a bulk Ferroelectric Crystal (Sn2P2S6:Te). A high gain (6 cm-1) was achieved without applying an external E-field.

  • self pumped optical phase conjugation at 1 06 μm in te doped sn 2 p 2 s 6
    Optics Express, 2005
    Co-Authors: Tobias Bach, P. Gunter, Mojca Jazbinsek, Alexander A Grabar, I M Stoika, Yulian Vysochanskii
    Abstract:

    We demonstrate self-pumped optical phase conjugation in Te-doped Sn2P2S6, a semiconducting Ferroelectric Crystal, using a 1.06 μm wavelength cw Nd:YAG laser. The photorefractive gain of this Crystal has been increased to Γ = (3.9 ± 0.4)cm-1 by Te doping. We observed self-pumped optical phase conjugation in a ring cavity scheme with phase conjugate reflectivities of more than 40 percent and a very fast phase conjugate rise time below 100ms at a light intensity of 20 W/cm2. This is more than two orders of magnitude faster than in any other photorefractive Crystal, as e.g. in Rh-doped BaTiO3.

Yutsun Shao - One of the best experts on this subject based on the ideXlab platform.

  • lattice rotation vortex at the charged monoclinic domain boundary in a relaxor Ferroelectric Crystal
    Physical Review Letters, 2017
    Co-Authors: Yutsun Shao
    Abstract:

    : We present evidence of lattice-rotation vortices having an average radius of ∼7  nm at the Ferroelectric domain boundary of (1-x)Pb(Zn_{1/3}Nb_{2/3})O_{3}-xPbTiO_{3} (x=0.08). Maps of Crystal orientations and domain symmetry breaking are obtained using scanning convergent beam electron diffraction, which show fractional rotation vortices near the 50° monoclinic domain walls. The merging of 2D and 1D topological defects is consistent with inhomogeneous boundary charge and expected to have a large impact on the domain-switching mechanisms in relaxor Ferroelectric Crystals and Ferroelectric devices.