William Shillue

Photonic LO Group Leader Backend Integrated Product Team Atacama Large Millimeter Array (ALMA) Project ALMA is an international radio astronomy project to build an ultra-high-performance interferometer array of 64 12-meter antennas operating from 27-950 GHz. * Responsible for design, construction, test, acceptance, delivery and installation of the ALMA Photonic LO subsystem * Supervision of Photonic LO engineering and technical staff and management of the NRAO NTC Photonic LO Integration Center * Responsible for international collaborations and administration of technical contracts

Project Responsible for all aspects of a new initiative to develop and integrate photonic and optical techniques into advanced telescope design. Program development and technical administration of contracts for High Frequency Photomixer and Wavelength Stabilized Laser Projects Design, construction, and site installation of the Holography photonic millimeter-wave synthesizer and transmitter at the ALMA antenna test facility at the Very Large Array Site in New Mexico Site Installation and test of an Atmospheric Site Test Interferometer at 5000m elevation at Chajnantor in the Chilean Andes Photonic Research and Development : High Frequency Photomixer Research and Development; Optical Phase-Locking of Lasers for LO Beatnote Generation,;Fiber Optic Phase Correction Technique; Ultra-long coherence and high-stability laser techniques Photonic Development and LO Reference Production: Design and fabrication of Laser Synthesizer and Line Length Corrector modules.

12-meter Telescope Operations: a world-class millimeter radio telescope, operating from 65-300 GHz. Responsible for all facets of telescope operations: design, laboratory and field test, with an emphasis on designing and maintaining high performance receivers and optics. Design of corrugated feed horn antennas for 100 and 300 GHz, with Fraunhofer quasi- optical lens correction Receiver and telescope beam pattern measurement and optical alignment Design of a new four-beam receiver optimized for carbon-monoxide molecular line research

Interferometer Project Responsible for Design, Production, Test, and Deployment of the Front End Receivers and Optics for the 13.7m Green Bank Earth Station, supporting multinational Orbiting Array Project Design featured cooled HFET receivers, and a dual-band (X- and Ku) circularly polarized receiving system, offset fed and diplexed via a frequency selective surface.

Laboratory for Advanced Millimeter-Wave Devices and Applications,; Demonstrated Improved Noise Performance of monolithic GaAs IMPATT oscillators at 55 GHz when operated in a Fabry-Perot resonator Developed radiation model for mutual coupling of adjacent oscillators in a solid-state active power combining array Achieved first reported power combining of monolithic IMPATT oscillators in a Fabry-Perot resonator at 50 GHz.

Performed Research and development tasks of software analysis, microwave circuit design, and antenna design in support of satellite programs Wrote software for the design of multibeam satellite lens antenna Completed design of a low-sidelobe offset dual reflector antenna Designed several RF- and L-band direct digital frequency synthesizer circuits