Abstract

When optical fibers are irradiated with intense fundamental and second-harmonic (SH) wave-lengths for long periods of time, permanent defects are created in the normally isotropic SiO₂. These defects have a dipole-allowed χ⁽²⁾ that is periodic along thedolom fiber length with the period of the coherent mixing term E(ω)²E*(2ω), i.e., Δk -= 2k(ω) — k(2ω).¹ Much of the recent work on this χ⁽²⁾ grating formation has concentrated on growth and saturation mechanisms that are coupled to the phase coherence of the grating.

© 1991 Optical Society of America