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The ultraviolet (UV) photosensitivity of Ta2O5measured in a rib waveguide Mach-Zehnder interferometer (MZI) is reported. With a cumulative fluence of 72 J/cm2at a wavelength of 248 nm incident upon one arm through a 3-mm-long window, the MZI exhibits a phase shift of 8/spl pi/ radians at wavelength /spl lambda/=1.55 μm, corresponding to a saturated refractive index change of 2.1×10/sup -3/. Real time measurements of the MZI output during exposure are given and the UV-induced refractive index change is found to be negative.
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Tai et al. (2004) studied this question.
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