Accession Number : ADP008140

Title :   Electric Field Induced Ferroelectric Microdomain Inversion on X- and Y-Cut Lithium Niobate,

Corporate Author : PADERBORN UNIV (GERMANY F R)

Personal Author(s) : Janzen, G. ; Seibert, H. ; Sohler, W.

Report Date : APR 1992

Pagination or Media Count : 2

Abstract : Ferroelectric microdomain inversion in LiNbO3 has been demonstrated as an important means for integrated optics technology allowing quasi-phasematching of second order nonlinear processes such as second harmonic generation in optical waveguides. Most of the processes investigated up to now for the generation of inverted microdomains are applicable only on +/-Z-faces of LiNbO3 1,2,3. For +/-Y-cut material we recently demonstrated periodical domain reversal by pyroelectrically generated electrical fields across a small gap between comblike electrodes 4; the depth of the microdomains was about 0.25 micrometer. In this contribution we present a new approach using again electrical fields between similar, photolithographically defined electrodes; however, now the electrical field is generated by applying a well defined external voltage. The new method gave a better control of the process and was successfully applied not only to Y-cut, but also - for the first time - to X-cut crystals. The depth of the domains could be increased up to 1.8 micrometer.

Descriptors :   *OPTICAL WAVEGUIDES, *FERROELECTRIC CRYSTALS, *HARMONIC GENERATORS, *FREQUENCY MULTIPLIERS, *LITHIUM NIOBATES, APPROACH, CONTROL, CRYSTALS, DEPTH, ELECTRODES, EXTERNAL, HARMONICS, INVERSION, MATERIALS, OPTICS, PERIODICALS, TIME, VOLTAGE, WAVEGUIDES, GERMANY, SINGLE CRYSTALS.

Subject Categories : Optics
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE