# The Quantum Theory of Light

@article{Sillitto1974TheQT,
title={The Quantum Theory of Light},
author={Richard M. Sillitto},
journal={Journal of Modern Optics},
year={1974},
volume={21},
pages={755-755}
}
• R. Sillitto
• Published 1 September 1974
• Physics
• Journal of Modern Optics
(b) Write out the equations for the time dependence of ρ11, ρ22, ρ12 and ρ21 assuming that a light field interaction V = -μ12Ee iωt + c.c. couples only levels |1> and |2>, and that the excited levels exhibit spontaneous decay. (8 marks) (c) Under steady-state conditions, find the ratio of populations in states |2> and |3>. (3 marks) (d) Find the slowly varying amplitude ̃ ρ 12 of the polarization ρ12 = ̃ ρ 12e iωt . (6 marks) (e) In the limiting case that no decay is possible from intermediate…
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