Olivier Lai

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Here we report successful interferometric coupling of two large telescopes with single-mode fibers. Interference fringes were obtained in the 2- to 2.3-micrometer wavelength range on the star 107 Herculis by using the two Keck 10-meter telescopes, each feeding their common interferometric focus with 300 meters of single-mode fibers. This experiment(More)
First light for the Keck II Natural Guide Star (NGS) Adaptive Optics (AO) facility was on the night of February 4, 1999. On the first attempt at closing the AO loops the image full-width-at-half-maximum (FWHM) went from 0.6 to 0.04 arcsec at Hband (1.65 μm wavelength), with a Strehl ratio of 25%. The AO system became an officially scheduled Keck science(More)
Building on an extensive and successful experience in Adaptive Optics (AO) and on recent developments made in its funding nations, the Canada-France-Hawaii-Telescope Corporation (CFHT) is studying the VASAO concept: an integrated AO system that would allow diffraction limited imaging of the whole sky in the visible as well as in the infrared. At the core of(More)
We report the discovery of a wide comoving substellar companion to the nearby (D = 67.5 ± 1.1 pc) A3V star ζ Delphini based on imaging and follow-up spectroscopic observations obtained during the course of our Volume-limited A-Star (VAST) multiplicity survey. ζ Del was observed over a five-year baseline with adaptive optics, revealing the presence of a(More)
The Īmaka project is a ground layer corrected wide field imager proposed for CFHT. It consists of three processes or components: The dome and local turbulence will be controlled by ventilation; the remaining ground layer turbulence will be corrected by a GLAO system and the free atmosphere seeing will be locally reduced by using an Orthogonal Transfer CCD(More)
Extensive results from the commissioning phase of PUEO, the adaptive optics instrument adaptor for the Canada{France{Hawaii telescope (CFHT), are presented and discussed. Analyses of more than 750 images recorded with a CCD and a near-IR camera on 16 nights in wavelengths from B to H are used to derive the properties of the compensated wavefront and images(More)
At the time of the conference, the Keck Adaptive optics system is undergoing laboratory integration and testing, and will soon be ready for its rst light on the telescope. We report on the expected and preliminary performance of the system. The testing is carried out using a turbulence generator and an artiicial star, and should thus allow an accurate(More)
DISCLAIMER: This is a working document. Its purpose is to establish the framework for the Science Cases for KPAO, given the expected performance, and to elicit a response, in the form of ideas, comments, suggestions or contributions from the targeted user community (and to widen that community, if possible). Therefore, the scope of the document is quite(More)
VASAO is an ambitious project that explores new conceptual direction in the field of astronomical adaptive optics. In the era of 8 meter and larger telescopes, and their instrument costs and telescope time pressure, there is a natural niche for such ground-breaking conceptual development in the 4 meter class telescope. The aim of VASAO is to provide(More)