By Chen S. Tsai (auth.), Professor Chen S. Tsai Ph. D. (eds.)
The box of built-in- or guided-wave optics has skilled major and non-stop progress in view that its inception within the overdue Sixties. there was a substantial raise in examine and improvement task during this box around the world and a few major advances within the cognizance of operating in tegrated optic units and modules were made lately. in truth, there have already been a few advertisement production and technical ap plications of such units and modules. The guided-wave-acoustooptics concerning Bragg interactions among guided optical waves and floor acoustic waves is among the components of in tegrated-optics that has reached a point of clinical and technological adulthood. This topical quantity is dedicated to an in-depth therapy of this rising department of technological know-how and expertise. offered during this quantity are concise remedies on bulk-wave acoustooptics, guided-wave optics, and floor acoustic waves, and distinctive experiences of guided-wave acoustooptic Bragg diffraction in 3 promising fabric substrates, specifically, LiNb0 , three ZnO/Si0 , and GaAs, the ensuing large band modulators and deflectors, 2 and purposes. The chapters hide not just the elemental rules and the oretical research, but in addition the layout, fabrication, and dimension of the ensuing units and modules, and their applications.
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Extra resources for Guided-Wave Acousto-Optics: Interactions, Devices, and Applications
Z can be regarded as the rate of change with distance in the z direction of the complex amplitude of the lower side band. The variation in refractive index that causes U _(z) to be generated is abrupt and rectangular in this heuristic picture. The variation in the actual situation is smooth and sinusoidal. z, a form quite in keeping with abruptness, with dU _(z)/dz, a form more characteristic of smoothness. 19) gives the rate of growth with distance of the downshifted side band. As it starts to grow, we might expect its increase in amplitude to be at the expense of a decrease in the amplitude of the incident wave.
3, we can see that the mechanism resulting in generating U _(z) because U i (z) is phase modulated, exists also in the reverse direction. U _(z), as well as U i (z), is modulated by the moving slabs. Modulating U _(z) produces two side bands, the up-shifted one having the same frequency as U i (z). 3 in precisely the direction of propagation of U i (z). Using arguments similar to the ones already employed, we can show that these upward reflections initially will have the correct direction, frequency and phase to subtract from the incident wave.
7 , the fraction of the incident beam that is scattered into the diffracted beam is closely approximated by TJ whenever TJ « 1. 66) For high scattering efficiency, TJ should be as large as possible. 66). 53]. The symbol M2 is presently used to designate this figure. 67) Simply stated, M2 relates the diffraction efficiency to the acoustic power for a given device geometry. 65,66) apply only when the Bragg condition is precisely met between the incoming planar light waves and the planar acoustic waves doing the diffracting.
Guided-Wave Acousto-Optics: Interactions, Devices, and Applications by Chen S. Tsai (auth.), Professor Chen S. Tsai Ph. D. (eds.)