Abstract
The ultraviolet (UV) photosensitivity of Ta2O5 measured in a rib waveguide Mach-Zehnder interferometer (MZI) is reported. With a cumulative fluence of 72 J/cm2 at a wavelength of 248 nm incident upon one arm through a 3-mm-long window, the MZI exhibits a phase shift of 8π radians at wavelength λ = 1.55 μm, corresponding to a saturated refractive index change of 2.1 × 10-3. Real time measurements of the MZI output during exposure are given and the UV-induced refractive index change is found to be negative.
Original language | English |
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Pages (from-to) | 1522-1524 |
Number of pages | 3 |
Journal | IEEE Photonics Technology Letters |
Volume | 16 |
Issue number | 6 |
DOIs | |
State | Published - Jun 2004 |
Keywords
- Integrated optics
- Mach-Zehnder interferometer (MZI)
- Photosensitivity
- Planar lightwave circuits