MULTIWAVELENGTH LASER PROPAGATION STUDY 2
Abstract
A series of significant multiwavelength laser propagation experiments were conducted with point-source transmitters and independent determinations of turbulence strengths. Under non-saturated scintillation conditions, it was found that the theoretical wavelength prediction of log amplitude variance is valid. Also, it was found that the near- and far-infrared wavelengths do not saturate at lower variances than visible wavelengths, and large infrared variances have been measured. It was found that different techniques for measuring the strength of turbulence yield different (but related) results. It was found that the multiwavelength covariance characteristics are usually independent of conditions and are near theoretical values, although certain anomalous results suggest limitations in the extent of the inertial subrange turbulence model. It was found that large receiver apertures do not result in the degree of reduction in total signal fluctuations that would be expected from the theory. Finally, it was found that simultaneous records of changing variances and turbulence strengths yield interesting characteristics which may be realted to the stationarity of the medium.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1970
- Accession Number
- AD0704535
Entities
People
- J. R. Kerr
Organizations
- Oregon Health & Science University