Abstract

We report the real-time evolution of the second-order nonlinearity ${\chi }^{\left(2\right)}$ induced in a twin-hole fiber during its first thermal poling and the subsequent repoling after thermal erasure. The considerable difference in the ${\chi }^{\left(2\right)}$ evolution in the two poling processes indicates that the first poling has a strong history effect on the repoling. We use a two-charge dynamics model involving a fast charge carrier ${\mathrm{Na}}^{+}$ and a slow charge carrier ${\mathrm{H}}^{+}$ to model the ${\chi }^{\left(2\right)}$ evolution in both poling processes. We quantitatively show that the difference in ${\chi }^{\left(2\right)}$ evolution is due to the different initial charge distributions before each poling. The extra ${\mathrm{H}}^{+}$ ions injected into the fiber during the first poling change the initial charge distribution in the second poling, which leads to a different ${\chi }^{\left(2\right)}$ dynamic.

© 2009 Optical Society of America

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