INTEGRATED OPTIC READ/WRITE HEAD FOR OPTICAL DATA STORAGE INCORPORATING SECOND HARMONIC GENERATOR, ELECTRO-OPTIC TRACKING ERROR ACTUATOR, AND ELECTRO-OPTIC MODULATOR

摘要

INTEGRATED OPTIC READ/WRITE HEAD FOR OPTICAL DATA STORAGE INCORPORATING SECOND HARMONIC GENERATOR, ELECTRO-OPTIC TRACKING ERROR ACTUATOR, AND ELECTRO-OPTIC MODULATOR An integrated electro-optic waveguide device has a substrate, an optically transparent lower buffer layer positioned atop the substrate, an optically transparent nonlinear optic (NLO) organic poled polymer waveguide positioned atop the lower buffer layer, and a GaAs laser diode optically coupled to the waveguide. The NLO material has a higher refractive index than the buffer layer. A ridge waveguide section forms an extended resonator cavity for the laser diode and combines a modulation function and an in-cavity quasi-phase matched second harmonic generation function. A grating coupled ridge-to-planar waveguide section combines a beam expansion function, a TE-TM conversion function, and a beam turning function. A planar surface prism electrode section provides electro-optic waveguide beam deflection. A dual linear grating coupler section performs the output/input coupling. Beam turning is accomplished by a planar waveguide mirror section. An electro-optic ridge waveguide Mach-Zehnder interferometer wavefront sensor section generates TES and FES signals.