MULTIWAVELENGTH LASER PROPAGATION STUDY--2
Abstract
In conducting multiwavelength scintillation experiments over a one mile path, it was found that a finite-sized transmitter aperture does not represent a true spherical-wave source, regardless of the beam divergence used. This observation has important implications for the interpretation of other data on the 'saturation' of scintillations, and in the present experiments has lead to the redesign of the transmitter to achieve a virtual point source. This has been completed, including a provision for independently increasing the aperture at each wavelength up to two inches in diameter, for later transmitter- aperture-dependence measurements. A highly-developed thermal probe system for the detailed study of turbulence structure was made completely operational, and a portable laser system was fabricated for independent 'optical turbulence strength' measurements. All subsystems of the experimental facility are operating without problems, and no further modifications are contemplated. In order to put the problem of atmospheric scintillations in current perspective and to guide the comprehensive experiments, a discussion of recent experimental and theoretical issues is given.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1970
- Accession Number
- AD0699498
Entities
People
- J. R. Kerr
Organizations
- Oregon Health & Science University