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Measurement of turbulence profile from defocused ring images
Andrei Tokovinin
A defocused image of a bright single star in a small telescope contains rich information on the optical turbulence, i.e. the seeing. The concept of a novel turbulence monitor based…
SAMplus: adaptive optics at optical wavelengths for SOAR
D. M. Faes, A. Tokovinin, T. Vieira +5
Adaptive Optics (AO) is an innovative technique that substantially improves the optical performance of ground-based telescopes. The SOAR Adaptive Module (SAM) is a laser-assisted A…
Ten years of speckle interferometry at SOAR
Andrei Tokovinin
Since 2007, close binary and multiple stars are observed by speckle interferometry at the 4.1 m Southern Astrophysical Research (SOAR) telescope. The HRCam instrument, observing st…
SOAR Adaptive Module (SAM): seeing improvement with a UV laser
Andrei Tokovinin, Rolando Cantarutti, Roberto Tighe +4
The adaptive module of the 4.1-m SOAR telescope, SAM, corrects ground-layer turbulence using a UV laser guide star. It has been commissioned in 2013 and it is in regular science op…
SRAO: optical design and the dual-knife-edge WFS
Carl Ziegler, Nicholas M. Law, Andrei Tokovinin
The Southern Robotic Adaptive Optics (SRAO) instrument will bring the proven high-efficiency capabilities of Robo-AO to the Southern-Hemisphere, providing the unique capability to…
CHIRON - A Fiber Fed Spectrometer for Precise Radial Velocities
Andrei Tokovinin, Debra A. Fischer, Marco Bonati +5
The CHIRON optical high-resolution echelle spectrometer was commissioned at the 1.5m telescope at CTIO in 2011. The instrument was designed for high throughput and stability, with…
Atmospheric time constant with MASS and FADE
Andrei Tokovinin
The approximate nature of the adaptive-optics time constant measurements with MASS is examined. The calibration coefficient C derived from numerical simulations of polychromatic sc…
Atmospheric image blur with finite outer scale or partial adaptive correction
P. Martinez, J. Kolb, A. Tokovinin +1
Seeing-limited resolution in large telescopes working over wide wavelength range depends substantially on the turbulence outer scale and cannot be adequately described by one "seei…