2006, Vol.16, No.2

Journal of the Korean Crystal Growth and Crystal Technology 2023 KCI Impact Factor : 0.19

pISSN : 1225-1429 / eISSN : 2234-5078
https://journal.kci.go.kr/jkcgct

Periodic electric field assisted poling low loss (~0.1 dB/cm) single-mode Ti-diffused waveguides in LiNbO3 has been achieved using a periodically patterned electrode on the +Z surface of Ti : LiNbO3 crystal and homogeneous LiCl solution. Using selective chemical etching, we confirmed the periodic (~16 μm) domain inverted structure and measured SH (second harmonic) properties of fabricated periodically poled Ti : LiNbO3 waveguides.

When external field was applied to congruent LiNbO3, it was investgated for domain formation and expansion of LiNbO3. The domain wall velocities of 0.5 mm thickness LiNbO3 were 28.70, 16.02 and 5.75 μm/sec under poling field of 23.5, 22.0 and 21.0 kV/mm, respectively. As 1 MΩ resistor was used in domain inversion system, harmonic domain inversion was not achieved by rapid domain expansion. And 50 % duty cycle periodically poled LiNbO3 have been fabricated by charge control using 10 MΩ resistor.@

Al-doped and F-doped ZnO (ZnO : Al & ZnO : F) thin films were coated onto glass substrate by sol-gel method.These films showed c-axis orientation in comon, but diferent I(002)/[I(002) + I(101)] and FWHM (full width at half-maximum). In particular, the grain size of the ZnO : Al films decreased with the increase in the Al-doping concentration,effect measurement was used. The resistivity of the ZnO : Al films and the ZnO : F films were, respectively, 2.9 × 102Ωcm at Al 1 at% and 3.3 × 101 Ωcm at F 3 at%. Moreover, compared with ZnO : Al films, ZnO : F films have lowercarier concentration (ZnO : Al 4.8 × 1018 cm3, ZnO : F 3.9 × 1016 cm3) and higher mobility (ZnO : Al 45 cm2/Vs, ZnO : F495 cm2/Vs). For average optical transmittances, ZnO : Al thin films have 86~90 % and ZnO : F films have 77~85 %comparatively low.Key words Sol-gel.. .. Al. F. ... ZnO ...... .. . ... ....... ..... ...†..... ....... , .. , 702-701(2005. 12. 26. .. )(2006. 1. 13. .... ). . Al. ... ZnO(ZnO : Al) ... F. ... ZnO(ZnO : F) ... sol-gel .. .... glass .... ..... . ..... (002).. c-. .... .... . FWHM(full width at half-maximum) ..