Accession Number : AD0715987

Title :   Development of Single Crystal Barium Sodium Niobate as a Nonlinear Optical Material.

Descriptive Note : Final technical rept. 15 May 69-15 Jun 70,

Corporate Author : CRYSTAL TECHNOLOGY INC MOUNTAIN VIEW CALIF

Personal Author(s) : Silva,William J. ; Nelson,Walter E. ; Rosengreen,Arne

Report Date : NOV 1970

Pagination or Media Count : 83

Abstract : Growth of barium sodium niobate single crystals by the Kyropoulos and Czochralski techniques is reported. Methods for growing single crystals under low thermal gradient conditions by the Czochralski technique are described in detail. Large c-axis boules were produced free of strain, scatter, and striae. Apparatus and techniques were developed for simultaneously poling and detwinning the crystals. Crystals grown from melts of standard, near stoichiometric, composition developed color centers. Crystals grown from niobium-deficient compositions were colorless, but highly strained. Fringe counts, transmittance as a function of applied electric field, second harmonic generation tests, and absorption measurements are described and the results are tabulated for crystals of three different compositions. Physical measurements and boule quality are correlated. (Author)

Descriptors :   (*NIOBATES, *CRYSTAL GROWTH), (*OPTICAL MATERIALS, SINGLE CRYSTALS), BARIUM COMPOUNDS, COLOR CENTERS, FERROELECTRIC CRYSTALS, MANUFACTURING, OPTICAL PROPERTIES

Subject Categories : Crystallography
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE