Accession Number:

ADA023479

Title:

COAT Measurements and Analysis

Descriptive Note:

Final technical rept. 1 Jul 1974-1 Jul 1975

Corporate Author:

HUGHES RESEARCH LABS MALIBU CA

Report Date:

1976-03-01

Pagination or Media Count:

106.0

Abstract:

Coherent optical adaptive techniques COAT have been studied by experiment, by analysis, and by computer simulation. The experiments have utilized a 21-channel, visible-wavelength, multidither COAT system, while the computer simulations have dealt with both multidither outgoing-wave and phase- conjugate return-wave systems. Thermal blooming and turbulence distortions and complex-target effects speckle-modulations have been studied. This report summarizes the status of the 21-channel DARPARADC, visible-wavelength, multidither COAT experimental model and associated hardware and its use in the experimental measurements on this contract. Experimental observations with the 21-channel COAT system show that blooming distortions occurring in the first 30 of the focused propagation path can be compensated, leading to roughly a factor of 1.5 increase in peak focused-beam irradiance. Computer simulation of phase-conjugate return-wave COAT systems has shown almost no blooming compensation. Experimental measurements of COAT operation with equal transmitter and receiver apertures and semidiffuse, extended-glint scotchlight surfaces have failed to produce any degradation in the system convergence level, even though significant spurious modulations within the dither band were observed in the COAT receiver.

Subject Categories:

  • Lasers and Masers
  • Optical Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE