  Propagation of optical vortex beamlet (OVB) in turbulent atmospheric
environment is studied theoretically by normalized models. Our simulation shows
that optical vortex beamlet is superior to traditional Gaussian beam in terms
of diffraction behavior of long haul propagation. Formation of vortex beam let
is experimentally demonstrated by using a spatial light modulator (SLM), which
achieve a power efficiency of more than 90% when the intrinsic loss in SLM is
excluded.
