Skip to main content

Research Repository

Advanced Search

Outputs (73)

Atmospheric optical turbulence measurements at varying elevation angles (2023)
Presentation / Conference Contribution
Westerby-Griffin, L., Osborn, J., Farley, O. J. D., Griffiths, R., & Love, G. D. (2023, January). Atmospheric optical turbulence measurements at varying elevation angles. Paper presented at Free-Space Laser Communications XXXV, San Francisco, United States

Atmospheric optical turbulence analysis in London’s financial district (2023)
Presentation / Conference Contribution
Westerby-Griffin, L., Osborn, J., Farley, O. J. D., Griffiths, R., & Love, G. D. (2023). Atmospheric optical turbulence analysis in London’s financial district. In H. Hemmati, & B. S. Robinson (Eds.), Proceedings Volume 12413, Free-Space Laser Communications XXXV. https://doi.org/10.1117/12.2648907

Atmospheric optical turbulence causes signal loses in laser propagation. Here we present vertical measurements of optical turbulence taken in London’s financial district. Additionally, we demonstrate a method of modelling atmospheric states in simula... Read More about Atmospheric optical turbulence analysis in London’s financial district.

The ESO’s Extremely Large Telescope Working Groups (2022)
Journal Article
Padovani, P., Cirasuolo, M., van der Burg, R., Cantalloube, F., George, E., Kasper, M., Leschinski, K., Martins, C., Milli, J., Möhler, S., Neeser, M., Neichel, B., Otarola, A., Sánchez-Janssen, R., Serra, B., Smette, A., Valenti, E., Verinaud, C., Vernet, J., Absil, O., …Vigan, A. (2022). The ESO’s Extremely Large Telescope Working Groups. https://doi.org/10.18727/0722-6691/5286

FAST: Fourier domain adaptive optics simulation tool for bidirectional ground-space optical links through atmospheric turbulence (2022)
Journal Article
Farley, O., Townson, M., & Osborn, J. (2022). FAST: Fourier domain adaptive optics simulation tool for bidirectional ground-space optical links through atmospheric turbulence. Optics Express, 30(13), 23050-23064. https://doi.org/10.1364/oe.458659

Free space optical links between the ground and space may be severely degraded by atmospheric turbulence. Adaptive Optics, a technique allowing partial correction of this degradation, is beginning to see use in the field with the potential to achieve... Read More about FAST: Fourier domain adaptive optics simulation tool for bidirectional ground-space optical links through atmospheric turbulence.

Scintillation-limited photometry with the 20-cm NGTS telescopes at Paranal Observatory (2021)
Journal Article
O’Brien, S. M., Bayliss, D., Osborn, J., Bryant, E. M., McCormac, J., Wheatley, P. J., Acton, J. S., Alves, D. R., Anderson, D. R., Burleigh, M. R., Casewell, S. L., Gill, S., Goad, M. R., Henderson, B. A., Jackman, J. A., Lendl, M., Tilbrook, R. H., Udry, S., Vines, J. I., & West, R. G. (2022). Scintillation-limited photometry with the 20-cm NGTS telescopes at Paranal Observatory. Monthly Notices of the Royal Astronomical Society, 509(4), 6111-6118. https://doi.org/10.1093/mnras/stab3399

Ground-based photometry of bright stars is expected to be limited by atmospheric scintillation, although in practice observations are often limited by other sources of systematic noise. We analyse 122 nights of bright star (Gmag ≲ 11.5) photometry us... Read More about Scintillation-limited photometry with the 20-cm NGTS telescopes at Paranal Observatory.

Astrosat: forecasting satellite transits for optical astronomical observations (2021)
Journal Article
Osborn, J., Blacketer, L., Townson, M. J., & Farley, O. J. (2022). Astrosat: forecasting satellite transits for optical astronomical observations. Monthly Notices of the Royal Astronomical Society, 509(2), 1848-1852. https://doi.org/10.1093/mnras/stab3003

The impact of large-scale constellations of satellites, is a concern for ground-based astronomers. In recent years there has been a significant increase in the number of satellites in low-Earth orbit and this trend is set to continue. The large numbe... Read More about Astrosat: forecasting satellite transits for optical astronomical observations.

HiPERCAM: a quintuple-beam, high-speed optical imager on the 10.4-m Gran Telescopio Canarias (2021)
Journal Article
Dhillon, V., Bezawada, N., Black, M., Dixon, S., Gamble, T., Gao, X., Henry, D., Kerry, P., Littlefair, S., Lunney, D., Marsh, T., Miller, C., Parsons, S., Ashley, R., Breedt, E., Brown, A., Dyer, M., Green, M., Pelisoli, I., Sahman, D., …García-Alvarez, D. (2021). HiPERCAM: a quintuple-beam, high-speed optical imager on the 10.4-m Gran Telescopio Canarias. Monthly Notices of the Royal Astronomical Society, 507(1), 350-366. https://doi.org/10.1093/mnras/stab2130

HiPERCAM is a portable, quintuple-beam optical imager that saw first light on the 10.4-m Gran Telescopio Canarias (GTC) in 2018. The instrument uses re-imaging optics and four dichroic beamsplitters to record usgsrsiszs (320–1060 nm) images simultane... Read More about HiPERCAM: a quintuple-beam, high-speed optical imager on the 10.4-m Gran Telescopio Canarias.

First stellar photons for an integrated optics discrete beam combiner at the William Herschel Telescope (2021)
Journal Article
Nayak, A. S., Labadie, L., Sharma, T. K., Piacentini, S., Corrielli, G., Osellame, R., Gendron, É., Buey, J.-T. M., Chemla, F., Cohen, M., Bharmal, N. A., Bardou, L. F., Staykov, L., Osborn, J., Morris, T. J., Pedretti, E., Dinkelaker, A. N., Madhav, K. V., & Roth, M. M. (2021). First stellar photons for an integrated optics discrete beam combiner at the William Herschel Telescope. Applied Optics, 60(19), D129-D142. https://doi.org/10.1364/ao.423881

We present the first on-sky results of a four-telescope integrated optics discrete beam combiner (DBC) tested at the 4.2 m William Herschel Telescope. The device consists of a four-input pupil remapper followed by a DBC and a 23-output reformatter. T... Read More about First stellar photons for an integrated optics discrete beam combiner at the William Herschel Telescope.

ELT-scale elongated LGS wavefront sensing: on-sky results (2021)
Journal Article
Bardou, L., Gendron, E., Rousset, G., Gratadour, D., Basden, A., Bonaccini Calia, D., Buey, T., Centrone, M., Chemla, F., Gach, J.-L., Geng, D., Hubert, Z., Laidlaw, D. J., Morris, T. J., Myers, R. M., Osborn, J., Reeves, A. P., Townson, M. J., & Vidal, F. (2021). ELT-scale elongated LGS wavefront sensing: on-sky results. Astronomy & Astrophysics, 649, Article A158. https://doi.org/10.1051/0004-6361/202038330

Context. Laser guide stars (LGS) allow adaptive optics (AO) systems to reach greater sky coverage, especially for AO systems correcting the atmospheric turbulence on large fields of view. However LGS suffer from limitations, among which is their appa... Read More about ELT-scale elongated LGS wavefront sensing: on-sky results.