Abstract

Photoinduced second-harmonic generation in silica fibers doped with Er3+, Sm3+, and Tb3+ has been investigated. Er3+-doped fibers have been found to tune a χ(2) grating easily to the mode structure of the laser radiation, whereas Sm3+-doped fibers have been found to possess the greatest resistance to χ(2) grating erasure by radiation at 532 nm. From the beginning of the preparation processes, the third harmonic at 355 nm is registered in all the fibers.

© 1994 Optical Society of America

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