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By Banerjee, Partha P.; Jarem, John M

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Extra resources for Computational Methods for Electromagnetic and Optical Systems, Second Edition

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This analysis has been done for a thin sample, meaning one where diffraction of the beam is neglected during its travel through the PR material, and by using a linearized theory to determine the induced refractive index profile. We have recently extended the linearized approach to the case of a thick sample, and have included the transient effects, and are in the process of determining the effects of transient DBF when a reading beam is used to illuminate a previously stored hologram in the PR material [30].

Overestimates the amount of cumulative PR effect. For the thick sample model, for the same value of P as above, we see negligible DBF for W less than 25 μm. On the other hand, the thin sample model predicts a value of W less than 5 μm for negligible beam fanning. t. the incident optical field. 5 mW occurs for W = 40 μm, in close agreement with the thin sample computations and the Airy function approach. However, the shift in the position of the mainlobe in the thick sample model is much smaller as compared to the thin sample case due to the effective decrease in the PR effect for a small waist size, as explained above.

31, 656, 1992. 30), we have taken the linear refractive index n0 equal to unity for the sake of simplicity. For a medium with n2 > 0, one can observe self-focusing of a Gaussian beam traveling through a medium, while self-defocusing is observed for a medium with n2 < 0. The physical reasoning behind self-focusing is as follows. , on-axis), the induced refractive index is higher as well, amounting to larger slowing down of the wavefronts. The wavefronts are therefore bent similar to the action of a positive lens, resulting in initial focusing of the beam.

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