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A channel waveguide can be self-written in a planar slab of photosensitive glass using a Gaussian beam [1]. Initially, the beam diffracts, as shown schematically in Fig. 1. Photosensitivity causes the refractive index to increase, the largest change being where the intensity is highest. Thus, the largest refractive index changes occur along the central axis, and the beam is gradually guided towards the axis.
© 1996 Optical Society of America
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