Abstract
Since the first report1 of efficient second-harmonic generation (SHG) in glass optical fibers four years ago, a number of models have been put forward to explain the effect. These can be roughly divided into two categories. In some models2,3,4 it is proposed that an internal d.c. electric field is set up which, acting on the χ(3) of the glass, serves as an effective χ(2). In other models5,6,7 it is proposed that the macroscopic χ(2) originates from an orienting of dipoles ("defects") in the glass. We have examined the polarization properties of the second-harmonic light generated by a single mode germania doped fiber. From the observed behavior we deduce that the effective χ(2) of the fiber behaves as a χ(3) of a nondispersive isotropic material (glass) acted on by a transverse d.c. electric field; in other words, we are likely dealing with an electric-field induced second-harmonic generation (EFISH) phenomenon.
© 1990 Optical Society of America
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