The Upper Atmosphere and Plasma Imager/the Telescope of Visible Light (UPI/TVIS) onboard the Kaguya spacecraft
The UPR Observatory A.O. System
The URAT Project
The use of a high-order MEMS deformable mirror in the Gemini Planet Imager
The use of adjusting surfaces.
The use of diffractive screens for electronic imaging
The use of laser guide stars in astronomy
The Use of Liquid Crystal Adaptive Optics Devices in Astronomy.
The use of optical fibres in radio astronomy
The use of Polaris seeing monitor to measure atmospheric seeing at La Palma
The use of simple relationships between wavefront aberration and wavelength to approximate the polychromatic optical transfer functions of 8 to 12 μm thermal imaging lenses.
The use of the pseudo-eikonal in the optimization of optical systems.
The Useful Field of View of an Adaptive Optics System
The Usefulness and Limits of Coronagraphy in the Presence of Pinned Speckles
The USNO 26'' Clark Refractor; From Visual Observations to Speckle Interferometry
The Utilization of Sensor, Based on Heterojunction, for the Astronomy
The UV Imaging Spectrometer for the Bepi-Colombo mission
The validation of Kepler planet detections
The variability of mesospheric water vapor
The variety of stable vortical solitons in Ginzburg-Landau media with radially inhomogeneous losses