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Gaussian beam optical systems with high gain or high loss media

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2 Author(s)
Tovar, A.A. ; Dept. of Electr. Eng., Portland State Univ., OR, USA ; Casperson, Lee W.

Coherent electromagnetic wave amplifiers with non-negligible gain per wavelength are included in the Gaussian beam matrix formalism and a procedure is developed for propagating Gaussian beams in optical systems that may include unsaturated amplifiers and similar absorbers. Standard formulas for beam spotsize and radius of curvature in a uniform medium are generalized in a new way to include gain or loss. An asymmetric focal shift and a potentially infinite spotsize are predicted. These dramatic effects are interpreted physically

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:43 ,  Issue: 8 )