Title :
UV photosensitivity in a Ta2O5 rib waveguide Mach-Zehnder interferometer
Author :
Chao-Yi Tai ; Grivas, C. ; Wilkinson, J.S.
Author_Institution :
Optoelectronics Res. Center, Univ. of Southampton, UK
fDate :
6/1/2004 12:00:00 AM
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 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.
Keywords :
Mach-Zehnder interferometers; integrated optics; light interferometry; optical fabrication; optical materials; optical waveguides; refractive index; rib waveguides; tantalum compounds; ultraviolet radiation effects; 1.55 mum; 248 nm; 3 mm; 3-mm-long window; MZI; Ta/sub 2/O/sub 5/; Ta/sub 2/O/sub 5/ rib waveguide Mach-Zehnder interferometer; UV photosensitivity; UV-induced refractive index change; phase shift; photosensitive materials; saturated refractive index change; ultraviolet photosensitivity; Holographic optical components; Holography; Optical films; Optical interferometry; Optical materials; Optical refraction; Optical scattering; Optical variables control; Optical waveguides; Refractive index;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.826757
