PREPARATION OF OPTICAL BA2NANB5O15 WAVE-GUIDE FILMS BY PULSED-LASER DEPOSITION

Waveguiding epitaxial Ba2NaNb5O15 films have been prepared on (010)-or iented KTiOPO4 substrates by a pulsed laser deposition technique. The as-grown films were characterized by an x-ray diffraction technique, s canning electron microscopy and polarized light microscopy, which reve aled that epitaxial (001)-oriented Ba2NaNb5O15 films with small surfac e roughness were achieved on (010)-oriented KTiOPO4 substrates. X-ray photoelectron spectroscopy was employed to determine the chemical cons titution of the as-grown films. Favourable optical waveguiding propert ies were demonstrated by m-line and light propagation loss measurement s of TM and TE multimodes.