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A microscopic model is given to explain the irreversible changes in glass fibers caused by simultaneous irradiation with 1064- and 532-nm light. The model involves an excitation of Ge E′ defects by photons of the fourth harmonic. A quantum-mechanical formalism is developed that is especially suited to describe a system under the influence of radiation fields.
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B. Lesche (1990) studied this question.
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