Reducing photorefractive effect in periodically poled ZnO- and MgO-doped LiNbO[sub 3] wavelength converters

Asobe, Masaki; Tadanaga, Osamu; Yanagawa, Tsutomu; Itoh, Hiroki; Suzuki, Hiroyuki
May 2001
Applied Physics Letters;5/21/2001, Vol. 78 Issue 21, p3163
Academic Journal
The photorefractive effect in annealed proton-exchanged waveguides in periodically poled nondoped, MgO- and ZnO-doped LiNbO[sub 3] was evaluated by monitoring the quasiphase matching (QPM) wavelength shift induced by a 0.784-μm-irradiating light. The QPM wavelength shift was reduced at room temperature by a factor of 3-6 in ZnO- and MgO-doped samples compared with the nondoped samples within a 10[sup 4]-10[sup 5]-W/cm[sup 2]-irradiation intensity range. The doped samples exhibited no significant wavelength shifts when the temperature was raised to slightly above room temperature (50-60 °C). © 2001 American Institute of Physics.


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