Abstract
In self-focusing media a plane wave of infinite extent breaks-up into a periodic array of individual intensity maxima. This has been reported in bulk quadratic and photorefractive media, but not in slab waveguides for which analytical theories exist.1,2 When the spatial beam profile contains a Fourier spectrum of spatial components, either due to noise or due to an injected periodic signal (seeding case), a range of these spectral components (noise case) or a single component (seeded case) can grow exponentially to produce periodic field structures. They are parameterized by the beam intensity I, the period Ʌ (=2π/κ) and the gain γ coefficient. For the noise case, the periodicity with the maximum gain (for a given intensity) wins out. For the seeded case, the injected periodic structure grows preferentially and the gain coefficient can be measured.
© 2001 Optical Society of America
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