title: Fast dynamic waveguides and waveguide arrays in photorefractive Sn(2)P(2)S(6) induced by visible light.
abstract: We report on dynamic waveguides and waveguide arrays induced beneath the surface of electro-optic Sn(2)P(2)S(6) crystals by visible light at 514 nm. The waveguide structures are generated by interband photoexcitation and drift or diffusion charge transport mechanism. These structures are probed nondestructively in the transverse direction with a beam at a longer wavelength. We measured the fastest formation of light induced waveguides in the visible up to now. The recording times are below 200 mus for intensities above 0.1 W/cm2. By interfering two light beams, dynamic waveguide arrays are generated with waveguide spacings of 7 microm. If an electric field is applied to the crystal, these arrays can be spatially shifted by 1.5 mum for an applied field of E(0) = 1 kV/cm.
authors.affiliation: Institute of Quantum Electronics, ETH Zurich, CH-8093 Zurich, Switzerland. nlo@phys.ethz.ch
authors.forename: Flurin
authors.initials: F
authors.lastname: Juvalta
authors.forename: Roger
authors.initials: R
authors.lastname: Mosimann
authors.forename: Mojca
authors.initials: M
authors.lastname: Jazbinsek
authors.forename: Peter
authors.initials: P
authors.lastname: Günter