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Photoerasure of UV-light-induced index change: wavelength dependence and use in the fabrication of gratings

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Abstract

Permanent photo-induced index gratings can be written internally1 or externally2 in high silica optical fibers using blue-green light (by two-photon absorption) or ultraviolet light (by one-photon absorption). The longest wavelength of light that can photoinduce gratings in the core of Ge-doped fibers is determined by the long wavelength cutoff (550 nm) for two-photon absorption.3 We show that grating fabrication can be extended to wavelengths>550 nm by resorting to a photoerasure process. To prepare a fiber for photoerasure it is exposed first to UV light pulses that increase the refractive index of the Ge-doped-core photosensitive fiber. The pulses have relatively low energy and are delivered at a slow pulse repetition rate to facilitate subsequent photoerasure. Light with wavelength >550 nm can write a grating by spatially selective erasure of the UV-induced increase in refractive index. Photobleaching of light-induced absorption4 using short wavelength light has been described before but, to our knowledge, long wavelength photoerasure of the index change is a new observation.

© 1992 Optical Society of America

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