By using a Mach–Zehnder interferometer, we evaluated photosensitivity in silica-based waveguides deposited by atmospheric pressure vapor deposition. Our results show that photosensitivity with ArF excimer laser irradiation was ten times greater than photosensitivity with KrF excimer laser irradiation. ArF excimer laser irradiation induced a refractive-index change of greater than 2 × 10-3 at 1.55 μm and a birefringence between TE and TM modes of less than 6 × 10-5. It has also been determined that the photoinduced absorption change of 90 dB/mm at 210 nm cannot account for a refractive-index change greater than 10-3.
© 1998 Optical Society of America
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(130.0130) Integrated optics : Integrated optics
(160.6030) Materials : Silica
(230.7370) Optical devices : Waveguides
(260.7190) Physical optics : Ultraviolet
Takashi Saito, Tadahiko Hanada, Naoki Kitamura, and Mitsuhiro Kitamura, "Photosensitivity in Silica-Based Waveguides Deposited by Atmospheric Pressure Chemical Vapor Deposition," Appl. Opt. 37, 2242-2244 (1998)