BaTiO3-based electro-optic single-sideband modulator for atomic gravimeter

Abstract

BaTiO3 (BTO) has emerged as an electro-optic (EO) material in integrated photonics, offering advantages over traditional materials such as LiNbO3 due to larger Pockels coefficients. BTO thin films on oxide substrates have been extensively studied for on-chip EO modulators that manipulate light properties in waveguides. One application is in compact laser systems for atomic gravity sensors, where BTO-based single-sideband (SSB) modulators reduce cost and power consumption by suppressing sidebands. This research presents the fabrication of an SSB modulator using BTO film on MgO substrate, operating at 780 and 1560 nm wavelengths. The modulator uses a Mach-Zehnder interferometer to convert a 1560 nm light source into a 6.8 GHz optical signal. This work advances integrated photonics by exploring the potential of BTO in compact laser systems for atomic gravity sensors.