Yongseog JEON and Hyun Shik KANG¹

Division of Electrical and Electronic Engineering, Jeonju University, Jeonju 560-759, Korea
¹Department of Physics Education, Chonbuk National University, Jeonju 561-756, Korea

(Received January 31, 2007; Accepted June 29, 2007)

Nonlinear optical materials of the type Zn_xCd_1-xTe single crystals, where x=0.0, 0.2, 0.4, 0.6, 0.7, 0.8, and 1.0, have been grown by the Bridgman method, using a vertical furnace. We have investigated the electro-optic (E-O) coefficient and refractive index of Zn_xCd_1-xTe single crystals at optical communication wavelength (1550 nm). In the case of CdTe crystal, the E-O coefficient was 15.5× 10^-12 m/V, which is the biggest among the E-O coefficients of Zn_xCd_1-xTe crystals. The E-O modulation signal was very big in low frequency range (DC–100 kHz), but the signal amplitude became smaller as we increased frequency above 100 kHz. We also found the acousto-optic modulation at CdTe single crystals.

Key words: electro-optic coefficient, THz generation, Pockels effect, acousto-optic modulator