宽带钽酸锂（LiTaO(3)）导波TE-TM模式转换器。

Broadband LiTaO(3) guided-wave TE-TM mode converter.

作者信息

Eknoyan O, Burns W K, Moeller R P, Frigo N J

出版信息

Appl Opt. 1988 Jan 1;27(1):114-7. doi: 10.1364/AO.27.000114.

DOI:10.1364/AO.27.000114

PMID:20523554

Abstract

A guided-wave TE to TM mode converter was demonstrated in LiTaO (3). The input mode is Bragg scattered from a collinear electrooptically induced wave of off-diagonal polarizability which couples the TE and TM modes. Compared with LiNbO(3), LiTaO(3) provides a smaller birefringence and thus a larger phase match period and larger optical bandwidth. A novel electrode structure allowed a four-phase drive of the polarizability wave with only two applied voltages. TE-TM mode conversion efficiency of 95% was demonstrated with a 103-A optical bandwidth. Operation as a frequency shifter was confined to low conversion efficiencies due to fringing fields.

摘要

在钽酸锂（LiTaO₃）中演示了一种导波TE到TM模式转换器。输入模式是从非对角极化率的共线电光感应波进行布拉格散射，该波耦合了TE和TM模式。与铌酸锂（LiNbO₃）相比，钽酸锂（LiTaO₃）的双折射较小，因此具有更大的相位匹配周期和更大的光学带宽。一种新颖的电极结构仅通过施加两个电压就可以对极化率波进行四相驱动。在103-A的光学带宽下演示了95%的TE-TM模式转换效率。由于边缘场的存在，作为移频器的操作仅限于低转换效率。