An athermal design for the KTP electro-optical modulator is presented. By using the wave coupling theory of linear electro-optic effect and taking account of thermal expansion, the more accurate athermal static phase retardation (ASPR) directions in potassium titanyl phosphate (KTP) are found, and the optimized design for a transverse amplitude modulator at ASPR orientation is obtained. The numerical results show that the modulator with an athermal Soleil–Babinet compensator is of excellent thermal stability, and the acceptable error of the ASPR direction is less than 0.1°.
© 2007 Optical Society of America
Original Manuscript: September 22, 2006
Revised Manuscript: April 5, 2007
Manuscript Accepted: July 28, 2007
Published: September 12, 2007
Guoliang Zheng, Jie Xu, Lixiang Chen, Hongcheng Wang, and Weilong She, "Athermal design for the potassium titanyl phosphate electro-optical modulator," Appl. Opt. 46, 6774-6778 (2007)