163 citations · 579 across the 27 of their papers we have counts for
28 papers
Laser guide star return-flux gain from frequency chirping
J. Hellemeier, M. Enderlein, M. Hager +7
Spectral hole burning reduces sodium laser guide star efficiency. Due to photon recoil, atoms that are initially resonant with the single-frequency laser get Doppler shifted out of…
Plaskett 1.8 metre Observations of Starlink Satellites
Aaron C. Boley, Ewan Wright, Samantha Lawler +2
We present observations of 23 Starlink satellites in the bandpass, obtained from the Dominion Astrophysical Observatory's Plaskett 1.8 metre telescope. The targets include a m…
Can amplified spontaneous emission produce intense laser guide stars for adaptive optics?
P. Hickson, J. Hellemeier, R. Yang
Adaptive optics (AO) is a key technology for ground-based optical and infrared astronomy, providing high angular resolution and sensitivity. AO systems employing laser guide stars…
Atomic transitions for adaptive optics
Rui Yang, Joschua Hellemeier, Paul Hickson
This paper reviews atoms and ions in the upper atmosphere, including the mesospheric metals Na, Fe, Mg, Si, Ca, K and also non-metallic species N, N, O, H, consider…
Night-time measurements of astronomical seeing at Dome A in Antarctica
Bin Ma, Zhaohui Shang, Yi Hu +6
Seeing, the angular size of stellar images blurred by atmospheric turbulence, is a critical parameter used to assess the quality of astronomical sites. Median values at the best mi…
Measuring line-of-sight sodium density structure using laser guide stars
Joschua A. Hellemeier, Domenico Bonaccini Calia, Paul Hickson +2
The performance of adaptive optics systems employing sodium laser guide stars can be improved by continuously monitoring the vertical density structure of mesospheric sodium along…