Abstract
Intense light can permanently and spontaneously transform simple optical fibers and bulk glasses into frequency doublers. The incident light causes a dc electric field to form inside the glass, which breaks the inversion symmetry of the glass and permits phase- matched second-harmonic generation. The electric field is induced most quickly by irradiating the sample simultaneously with laser beams at frequency ω and at frequency 2ω. This light-induced dc electric field (acting through the third-order susceptibility) explains most of the characteristics of second- harmonic generation in glass.1-4
© 1993 Optical Society of America
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