All Outputs (10)

The 24hSHIMM: a continuous day and night turbulence monitor for optical communications (2023)
Presentation / Conference Contribution
Griffiths, R., Osborn, J., Farley, O., Butterley, T., Townson, M., & Wilson, R. (2023, January). The 24hSHIMM: a continuous day and night turbulence monitor for optical communications. Presented at Free-Space Laser Communications XXXV, San Francisco, United States

We present the 24-hour Shack-Hartmann Image Motion Monitor (24hSHIMM), the first truly continuous, 24-hour optical turbulence monitor. Atmospheric optical turbulence is a significant limitation for free-space optical communications and other technolo... Read More about The 24hSHIMM: a continuous day and night turbulence monitor for optical communications.

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.

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

Correction of photometric scintillation noise via tomographic wavefront sensing: simulation and on-sky demonstration (2022)
Presentation / Conference Contribution
Hartley, K., Farley, O., Townson, M. J., Osborn, J., & Wilson, R. W. (2022, July). Correction of photometric scintillation noise via tomographic wavefront sensing: simulation and on-sky demonstration. Presented at Adaptive Optics Systems VIII, Montréal, Canada

Correction of finite spatial and temporal sampling effects in stereo-SCIDAR (2020)
Presentation / Conference Contribution
Butterley, T., Sarazin, M., Le Louarn, M., Osborn, J., & Farley, O. J. (2020, December). Correction of finite spatial and temporal sampling effects in stereo-SCIDAR. Presented at SPIE Astronomical Telescopes + Instrumentation 2020, Online

Stereo scintillation detection and ranging (S-SCIDAR) is a development of the well-established SCIDAR turbulence profiling technique. An S-SCIDAR instrument has been installed at the focus of one of the 1.8m Auxiliary Telescopes at Paranal observator... Read More about Correction of finite spatial and temporal sampling effects in stereo-SCIDAR.

Photometry and Spectrum measurements of the Laser Guide Star beam emission at Observatorio del Roque de Los Muchachos with the Gran Telescope Canarias (2017)
Presentation / Conference Contribution
Lombardi, G., Calia, B., Centrone, M., Talavera, M. R. G., Morris, T., Pfrommer, T., Basden, A., Vidal, F., Gendron, E., Rousset, G., Mayers, R., Osborn, J., Reeves, A., Talbot, R., Townson, M., Lavers, A. C., & Postigoh, A. D. U. (2017, June). Photometry and Spectrum measurements of the Laser Guide Star beam emission at Observatorio del Roque de Los Muchachos with the Gran Telescope Canarias. Presented at Adaptive Optics for Extremely Large Telescopes 5, Tenerife, Canary Islands, Spain

In the past years ESO has built together with industry a transportable Laser Guide Star Unit (WLGSU) to test the laser technology while supporting some strategic experiments for the LGS-AO technologies. Since July 2016, the WLGSU has been installed a... Read More about Photometry and Spectrum measurements of the Laser Guide Star beam emission at Observatorio del Roque de Los Muchachos with the Gran Telescope Canarias.

Preliminary on-sky results of the CANARY experiment with an ELT-elongated sodium LGS (2017)
Presentation / Conference Contribution
Bardou, L., Gendron, E., Rousset, G., Gratadour, D., Basden, A. G., Bonaccini, D., Buey, T., Centrone, M., Chemla, F., Lombardi, G., Marchetti, E., Morris, T. J., Myers, R. M., Osborn, J., Townson, M. J., Vidal, F., & Reyes Garcia-Talavera, M. (2017, June). Preliminary on-sky results of the CANARY experiment with an ELT-elongated sodium LGS. Presented at Adaptive Optics for Extremely Large Telescopes 5, Tenerife, Canary Islands, Spain

We present on-sky results of wavefront sensing on an elongated LGS. These results are derived from observations made with the multi-object AO demonstrator CANARY on the William Herschel Telescope (WHT) in La Palma. The laser guide star is produced us... Read More about Preliminary on-sky results of the CANARY experiment with an ELT-elongated sodium LGS.

Turbulence profiling for adaptive optics tomographic reconstructors (2016)
Presentation / Conference Contribution
Laidlaw, D. J., Osborn, J., Wilson, R. W., Morris, T. J., Butterley, T., Reeves, A. P., Townson, M. J., Gendron, É., Vidal, F., & Morel, C. (2016, July). Turbulence profiling for adaptive optics tomographic reconstructors

Final two-stage MOAO on-sky demonstration with CANARY (2016)
Presentation / Conference Contribution
Gendron, E., Morris, T., Basden, A., Vidal, F., Atkinson, D., Bitenc, U., Buey, T., Chemla, F., Cohen, M., Dickson, C., Dipper, N., Feautrier, P., Gach, J.-L., Gratadour, D., Henry, D., Huet, J.-M., Morel, C., Morris, S., Myers, R., Osborn, J., …Younger, E. (2016, July). Final two-stage MOAO on-sky demonstration with CANARY. Presented at SPIE Astronomical Telescopes + Instrumentation, Edinburgh

Daytime site characterisation of La Palma, and its relation to night-time conditions (2014)
Presentation / Conference Contribution
Townson, M., Kellerer, A., Osborn, J., Butterley, T., Morris, T., & Wilson, R. (2014, December). Daytime site characterisation of La Palma, and its relation to night-time conditions. Presented at Ground-based and Airborne Instrumentation for Astronomy V, Montréal, Quebec

This paper presents preliminary daytime profiles taken using a Wide-Field Shack-Hartmann Sensor at the Swedish Solar Telescope (SST), La Palma. These are contrasted against Stereo-SCIDAR data from corresponding nights to assess the validity of the as... Read More about Daytime site characterisation of La Palma, and its relation to night-time conditions.