Dual-channel heterodyne measurements of atmospheric phase fluctuations.
A dual-channel fiber-coupled laser heterodyne system operating at a 1.55-microm wavelength is used to investigate phase fluctuations induced on a laser beam by propagation through turbulent air. Two receivers are used to characterize spatial and temporal variations produced by a turbulent layer of air in the laboratory. The system is also used for measurements through extended turbulence along an 80-m outdoor atmospheric path. Phase structure functions, power spectral densities, and cross correlations are presented.
Ridley
Kevin D
KD
QinetiQ, Room PB-115, St. Andrews Road, Malvern, Worcestershire WR14 3PS, UK. kdridley@qinetiq.com
Jakeman
Eric
E
Bryce
David
D
Watson
Stephen M
SM