56 citations · 77 across the 9 of their papers we have counts for
9 papers
The 4m International Liquid Mirror Telescope: Construction, operation, and science
Jean Surdej, Paul Hickson, Kuntal Misra +26
The International Liquid Mirror Telescope (ILMT) project was motivated by the need for an inexpensive 4 metre diameter optical telescope that could be devoted entirely to astronomi…
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…
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…
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…
Frequency chirped continuous-wave sodium laser guide stars
F. Pedreros Bustos, R. Holzlöhner, S. Rochester +3
We numerically study a method to increase the photon return flux of continuous-wave laser guide stars using one-dimensional atomic cooling principles. The method relies on chirping…
Optical turbulence at Ali, China -- Results from the first year of lunar scintillometer observations
Paul Hickson, Lu Feng, Joschua A. Hellemeier +6
The location of an astronomical observatory is a key factor that affects its scientific productivity. The best astronomical sites are generally those found at high altitudes. Sever…
Polarization-driven spin precession of mesospheric sodium atoms
Felipe Pedreros, Domenico Bonaccini Calia, Dmitry Budker +5
We report experimental results on the first on-sky observation of atomic spin precession of mesospheric sodium driven by polarization modulation of a continuous-wave laser. The mag…
Remote sensing of geomagnetic fields and atomic collisions in the mesosphere
Felipe Pedreros Bustos, Domenico Bonaccini Calia, Dmitry Budker +5
Magnetic-field sensing has contributed to the formulation of the plate-tectonics theory, the discovery and mapping of underground structures on Earth, and the study of magnetism in…