Enhanced c-axis KTN beam deflector by compensating compositional gradient effect with a thermal gradient

• Published in: OSA continuum Vol. 4; no. 2; p. 665
• Main Authors: Lee, Yun Goo, Chen, Chang-Jiang, Shang, Annan, Liu, Ruijia, Chao, Ju-Hung, Yin, Shizhuo
• Format: Journal Article
• Language: English
• Published: 15-02-2021
• ISSN: 2578-7519; 2578-7519
• DOI: 10.1364/OSAC.414124

In this paper, we propose an enhanced c-axis potassium tantalate niobate (KTN) based electro-optic (EO) deflector by compensating the performance degradation using a thermal gradient. The naturally existing composition gradient in KTN crystals prevents KTN deflectors from working at its maximum functionality at all locations along the propagation path. To overcome this fundamental limitation, we propose a KTN deflector with a temperature gradient to ensure all locations of KTN to work at the temperature having its highest permittivity. Our experimental data shows the KTN deflector with temperature gradient has near three times higher deflection angle than that of the case under uniform temperature.