Ms. M. Olivia Garton Profile

M. Olivia Garton

at Air Force Research Lab.

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Proceedings Article | 28 August 2024 Presentation

Recent advances in sodium laser beacon development

Robert Johnson, Lee Kann, M. Olivia Garton, Steven Massey, Colton Bigler, Tanya Tavenner, Tod Laurvick, Frank Lison, Martin Enderlein, Sebastian Hepp

Proceedings Volume 13097, 130972I (2024) https://doi.org/10.1117/12.3018166

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Scientists at the Starfire Optical Range (SOR) have been researching Rayleigh beacons and mesospheric sodium beacons for adaptive optics (AO) for nearly three decades. We developed four different sodium-wavelength lasers, all of which were based on diode-pumped, sum-frequency Nd:YAG oscillators. In 2016, we combined light from two commercial 22-watt, sodium-wavelength lasers to form a single beacon. These commercial lasers, which use resonant-frequency doubling of light from a Raman fiber-amplifier, were built by MPB Communications and Toptica Projects. In 2019, we started to develop and procure a 75-watt sodium-wavelength laser to enable better correction of turbulence in poor seeing. In conjunction with Toptica Projects and European astronomers, we have increased the return flux from sodium beacons by shifting or chirping the laser wavelength to compensate for recoil of optically pumped sodium atoms. In addition, we have demonstrated a single-sideband D2b re-pumper. In this talk, we review the development our new sodium beacon laser and discuss results from an on-sky test in 2023 that demonstrates the improvement in beacon brightness by using these techniques.

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