Accession Number : AD0696134

Title :   MULTIWAVELENGTH LASER PROPAGATION STUDY. II.

Descriptive Note : Quarterly progress rept. no. 1, 15 Jun-15 Sep 69,

Corporate Author : OREGON GRADUATE CENTER FOR STUDY AND RESEARCH PORTLAND

Personal Author(s) : Kerr,J. Richard

Report Date : OCT 1969

Pagination or Media Count : 32

Abstract : The objective of this program is to experimentally investigate simultaneous multiwavelength optical and infrared propagation through a turbulent atmosphere, in order to answer certain fundamental questions pertaining to the wavelength-dependence of scintillation. The experimental system is now fully operational in its improved form, and permits the simultaneous measurement of a number of statistical scintillation quantities at 4880A, 1.15 micrometers, and 10.6 micrometers, with direct, real-time recording of the results. The system is operated over a one-mile, uniform path, and utilizes very-large-dynamic-range electronics and low-noise lasers and detectors. A separate, nonoptical thermal instrument has been developed to provide an independent measure of turbulence characteristics. Preliminary results show that the infrared scintillations are log normally distributed, and suggest the possibility that saturated variances are proportional to the 7/6-power of the wavenumber, so that 10.6 micrometers radiation will saturate at a relatively low variance. (Author)

Descriptors :   (*LIGHT TRANSMISSION, *ATMOSPHERIC MOTION), (*GAS LASERS, LIGHT TRANSMISSION), PROPAGATION, COHERENT RADIATION, SCINTILLATION, ATMOSPHERE MODELS, RANGES(FACILITIES), SCATTERING

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE