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

• Main Author: REVELLI, JOSEPH F., JR
• Format: Patent
• Language: English; French
• Published: 16.04.1994
• Edition: 5
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

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.