MRS Proceedings

Table of Contents - Volume  244  - Symposium J – Optical Waveguide Materials  

Editors : M. M. Broer, H. Kawazoe, R. Th. Kersten, G. H. Sigel


Permanent Photoinduced Refractive Index Changes in Rare Earth Doped Glasses

1991 MRS Fall Meeting.

Glen M. Williamsa1*, Jacqueline A. Rullera1 and E. Joseph Friebelea1

a1 Code 6505, Optical Sciences Division, Naval Research Laboratory, Washington, DC 20375.


Permanent refractive index gratings were holographically photowritten into rare earth doped glasses using the 488 rn line of a Ar Ion laser. The rare earths Pr3+, Tb3+, and Eu2+ were examined. Experiments were performed to elucidate the mechanism responsible for the photoinduced index change. A model is presented in which the index change is accomplished through photoionization of the rare earth dopant and subsequent trapping of the free carrier. The viability of these materials for use in optical fiber grating devices is discussed.


* Also with the Department of Electrical Engineering, Virginia Polytechnical and State University, Blacksburg, VA 24061.