Abstract

One challenge for polychromatic laser guide stars is to create a sufficiently intense source in the UV. The flux required for the measurement of differential tip–tilt is the main issue that we address. We describe a model that has been validated using on-sky data. We present a method that excites the 4P32 sodium level using a one-photon excitation at 330nm. It is more efficient than the two-photon excitation previously suggested since its power slope flux is 3×104photonssm2W instead of 1.3×103photonssm2W. This method is very promising both in terms of flux and system simplicity.

© 2006 Optical Society of America

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