Irradiating glass by intense light at frequencies {ω} and 2{ω} generates a semipermanent dc electric field in the glass that transforms the glass into a phase-method optical-frequency doubler. We map out this dc electric field over a wide variety of experimental conditions. We show that its symmetries are predicted by a theory based on the interference of competing multiphoton ionization channels.
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Dominic et al. (1993) studied this question.
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