  Laser guide stars created by Rayleigh scattering provide a reasonable means
to monitor atmospheric wavefront distortions for real-time correction by
adaptive optics systems. Because of the $\lambda^{-4}$ wavelength dependence of
Rayleigh scattering, short wavelength lasers are a logical first choice for
astronomical laser guide star systems, and in this paper we describe the
results from a sustained experimental effort to integrated into an adaptive
optics system a 351 nm Rayleigh laser guide star created at an altitude of 20
km (above MSL) at the Mt. Wilson 2.5-m telescope. In addition to providing
obvious scientific benefits, the 351 nm laser guide star projected by UnISIS is
"Stealth qualified: in terms of the FAA and airplane avoidance. Due to the
excellent return signal at the wavefront sensor, there is no doubt that future
applications will be found for short-wavelength Rayleigh scattered laser guide
stars.
