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Proceedings Paper

Investigations of long pulse sodium laser guide stars
Author(s): Rachel Rampy; Donald Gavel; Simon Rochester; Ronald Holzlöhner
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Paper Abstract

Long pulse length sodium laser guide stars (LGS) are useful because they allow for Rayleigh blanking and fratricide avoidance in multiple LGS systems. Bloch equation simulations of sodium-light interactions in Mathematica show that certain spectral formats and pulse lengths, on the order of 30 microseconds, with high duty cycles (20-50%) should be able to achieve photon returns within 10% of what is seen from continuous wave (CW) excitation. In this work, we investigate the time dependent characteristics of sodium fluorescence, and find the optimal format for the new LGS that will be part of the upgraded AO system on the Shane 3 Meter telescope at Mt. Hamilton. Results of this analysis are discussed along with their general applicability to other LGS systems. The potential benefits of uplink correction are also considered.

Paper Details

Date Published: 13 September 2012
PDF: 9 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 84474L (13 September 2012); doi: 10.1117/12.926621
Show Author Affiliations
Rachel Rampy, Univ. of California, Santa Cruz (United States)
Donald Gavel, Univ. of California, Santa Cruz (United States)
Simon Rochester, Rochester Scientific LLC (United States)
Ronald Holzlöhner, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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