Impact of exposure time on optical-phase measurements in turbulence.

In this paper, we explore the impact of exposure time on optical-phase measurements collected on light that has propagated through atmospheric-optical turbulence. We model the exposure time by phase averaging over a convective distance, and we quantify the associated impact of imposing an exposure time using the piston- and tilt-removed phase variance. We accomplish this analysis through the development of an analytic solution and wave-optics simulations.

Tracking bandwidth limitations for strong optical-turbulence conditions.

We derive a modified fundamental tracking frequency that is applicable for beam-control systems that do not employ adaptive-optics compensation. Specifically, we show that there are diminishing returns on tracking faster than the modified fundamental tracking frequency. Furthermore, when D/r > 4, where D is the aperture diameter and r is the Fried parameter, we show that increasing the track bandwidth alone will not improve system performance.