SPATIAL MODULATION OF LIGHT BY OPTICAL PUMPING.
Foundational research rept.,
NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AERO-ELECTRONIC TECHNOLOGY DEPT
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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
- Lasers and Masers