Electro-optic guided-to-radiation mode conversion in Cu-diffused LiTaO3 waveguide with periodic electrodes

1 February 1978

journal article
research article
Published by AIP Publishing in Applied Physics Letters

Vol. 32 (3) , 161-163
https://doi.org/10.1063/1.89968

Abstract

We report electro‐optically controlled guided‐to‐radiation mode conversion at 0.63‐μm wavelength in a waveguide formed by electrodiffusing Cu ions in a c‐plate crystal of LiTaO₃. The efficiency of conversion from TE₁ guided mode to TM radiation modes was measured by a low‐frequency (0.5 kHz) modulation experiment with special attention paid to the dependence of the modulation efficiency on the longitudinal period of coplanar electrodes. Maximum mode conversion was observed at a 298‐μm period where the efficiency was 21%/cm (16% for actual interaction length of 7.4 mm) with an applied voltage 600 V across the 45‐μm gap. With a slight deviation (±10 μm) in the period, the efficiency was decreased to less than 10%/cm and its sensitivity is attributed to the change in the transverse field overlap of the coupled modes.

Keywords

LOW FREQUENCY

This publication has 3 references indexed in Scilit:

Electrooptic coupling between TE and TM modes in anisotropic slabs
IEEE Journal of Quantum Electronics, 1975
Fabrication of optical waveguiding layer in LiTaO3 by Cu diffusion
Applied Physics Letters, 1974
Guided wave optics
Proceedings of the IEEE, 1974