Accession Number:

AD0769792

Title:

Propagation of Multiwavelength Laser Radiation through Atmospheric Turbulence

Descriptive Note:

Final technical rept. 15 Jun 1972-31 Aug 1973

Corporate Author:

OREGON GRADUATE CENTER FOR STUDY AND RESEARCH PORTLAND

Personal Author(s):

• Kerr, J. Richard

Report Date:

1973-08-01

Pagination or Media Count:

78.0

Abstract:

The investigations on this program have included the measurement of multiwavelength scintillation statistics over a very long, highly turbulent path the analytical and experimental study of finite-transmitter and wander- tracking effects on target irradiance and the study of the detailed nature of microthermal turbulence fluctuations, including turbulent intermittency, as related to short-term scintillation statistics. The latter two areas represent ongoing efforts, and are reviewed in this report. Finite-beam experiments are being conducted with a wander-cancelling, tracking-transmitter over a 1.6 km, uniform path. A new prediction is given for the transverse amplitude correlation length under near field conditions in strong turbulence. Microthermal fluctuations due to turbulence are considered, and it is shown experimentally that the statistics of appropriately averaged first-increments or derivatives behave in accordance with recent theoretical predictions.

Descriptors:

• *INFRARED TRACKING
• *LASER BEAMS
• ATMOSPHERIC MOTION
• ATTENUATION
• SCINTILLATION

Subject Categories:

• Lasers and Masers
• Infrared Detection and Detectors
• Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE