Accession Number:

AD0823507

Title:

SPATIAL MODULATION OF LIGHT BY OPTICAL PUMPING.

Descriptive Note:

Foundational research rept.,

Corporate Author:

NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AERO-ELECTRONIC TECHNOLOGY DEPT

Personal Author(s):

Report Date:

1967-11-15

Pagination or Media Count:

22.0

Abstract:

A study was made to determine the feasibility of spatially-modulating a coherent light beam with an incoherent light image I sub ic. This technique is based on the principle that I sub ic can pump atoms into a metastable energy level that can partially absorb coherent light of the proper frequency. Three- and four-level atomic systems were considered, with the latter found to be more suitable. Formulae were derived for the modulation, response time, and signal-to-noise ratio of the four-level system. A numerical example is given to demonstrate its feasibility. A useable range of level decay rates and energies is tabulated to facilitate the search for an appropriate modulating material. Author

Subject Categories:

  • Lasers and Masers
  • Optics
  • Bionics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE