Observation of a fifth-order optical nonlinearity in Bi0.9La0.1Fe0.98Mg0.02O3 ferroelectric thin films

Bing Gu; Yang Wang; Wei Ji; Wang, John
July 2009
Applied Physics Letters;7/27/2009, Vol. 95 Issue 4, p041114
Academic Journal
Ferroelectric Bi0.9La0.1Fe0.98Mg0.02O3 thin films with high optical quantity were deposited on quartz substrates by radio frequency magnetron sputtering at 650 °C. The interplay between third- and fifth-order optical nonlinearities is observed by performing Z-scans under femtosecond laser excitation with 1.60 eV photon energy. The measured third-order nonlinearities mainly originate from electronic Kerr effect and two-photon absorption (2PA), while the population redistribution assisted by 2PA leading to an equivalent stepwise χ(3):χ(1) process is the main mechanism of the fifth-order effect.


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