Search for dissertations about: "QPM"

Showing result 11 - 15 of 16 swedish dissertations containing the word QPM.

  2. 11. Ferroelectric domain engineering and characterization for photonic applications

    Author : Simonetta Grilli; Fredrik Laurell; Wolfgang Sohler; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; LiNbO; KTiOPO; interferometry; digital holography; electric field poling; electro-optic materials; holographic lithography; ferroelectric domains; nanostructures; microstructures; Optical physics; Optisk fysik;

    Abstract : Lithium niobate (LiNbO3) and KTiOPO4 (KTP) are ferroelectric crystals of considerable interest in different fields of optics and optoelectronics. Due to its large values of the nonlinear optical, electro-optic (EO), piezoelectric and acousto-optical coefficients, LiNbO3 is widely used for laser frequency conversion using the quasiphase matching (QPM) approach where the sign of nonlinearity has been periodically modulated by electric field poling (EFP). READ MORE

  4. 12. Domain engineering in KTiOPO4

    Author : Carlota Canalias; Fredrik Laurell; Benoît Boulanger; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; quasi-phase matching; KTiOPO4; ferroelectric domains; atomic force microscopy; periodic electric field poling; polarization switching; second harmonic generation; Optical physics; Optisk fysik;

    Abstract : Ferroelectric crystals are commonly used in nonlinear optics for frequency conversion of laser radiation. The quasi-phase matching (QPM) approach uses a periodically modulated nonlinearity that can be achieved by periodically inverting domains in ferroelectric crystals and allows versatile and efficient frequency conversion in the whole transparency region of the material. READ MORE

  5. 13. Studies on Domain Wall Properties andDynamics in KTiOPO4 and Rb-doped KTiOPO4

    Author : Gustav Lindgren; Carlota Canalias; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

    Abstract : KTiOPO4 (KTP) and Rb-doped KTP (RKTP) are two of the most attractive nonlinear opticalmaterials for engineering of periodically poled domain structures, commonly used as frequencyconversiondevices for laser radiation via the quasi-phase matching (QPM) technique. Thesematerials have excellent non-linearity, wide transparency windows and high resistance to opticaldamage. READ MORE

  6. 14. Characterization of domain switching and optical damage properties in ferroelectrics

    Author : Junji Hirohashi; Fredrik Laurell; Ady Arie; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; quasi-phase matching; ferroelectric domains; stoichiometric LiNbO3; stoichiometric LiTaO3; KTiOPO4; KNbO3; polarization switching; periodic electric field poling; optical damages; Optical physics; Optisk fysik;

    Abstract : Nonlinear optical frequency conversion is one of the most important key techniques in order to obtain lasers with wavelengths targeted for specific applications. In order to realize efficient and tailored lasers, the quasi-phase-matching (QPM) approach using periodically-poled ferroelectric crystals is getting increasingly important. READ MORE

  7. 15. Components based on optical fibers with internal electrodes

    Author : Niklas Myrén; KTH; []
    Keywords : Poling; twinhole fiber; fiber electrodes; silver film electrodes; silver diffusion; quasi-phase matching; optical switching; frequency conversion; optical modulation;

    Abstract : The topic of this thesis is development ofdevices fortelecom applications based on poled optical fibers. The focusis on two different specific functions, wavelength conversionand optical switching.Optical switching is demonstrated in a poled optical fiberat telecom wavelengths (~1.55 mm). READ MORE