Advances in Integrated Optics by S. Pelli, G. C. Righini (auth.), S. Martellucci, A. N.

By S. Pelli, G. C. Righini (auth.), S. Martellucci, A. N. Chester, M. Bertolotti (eds.)

This volwne comprises the court cases of a two-week summer season convention titled "Advances in built-in Optics" held June 1-9, 1993, in Erice, Sicily. This used to be the 18th annual path equipped by way of the overseas institution of Quantum Electronics, lower than the auspices of the "Ettore Majorana" Centre for clinical tradition. The time period built-in Optics indicates guided-wave optical circuits including or extra units on a unmarried substrate. on account that its inception within the overdue 1960's, built-in Optics has developed from a really good study subject right into a huge box of labor, starting from uncomplicated examine via advertisement functions. this day many units can be found on marketplace whereas an immense attempt is devolved to analyze on built-in nonlinear optical units. This convention used to be geared up to supply a accomplished survey of the frontiers of this know-how, together with basic suggestions, nonlinear optical fabrics, units either within the linear and nonlinear regimes, and chosen purposes. those lawsuits replace and increase the fabric contained in a prior ISQE quantity, "Integrated Optics: Physics and Applications", S. Martellucci and A. N. Chester, Eds. , NATO ASI sequence B, Vol. ninety one (Plenum, 1983). For a few heavily comparable expertise, the reader many additionally desire to seek advice the ISQE volumes: "Optical Fiber Sensors", A. N. Chester, S. Martellucci and A. M. Scheggi, Eds. , NATO ASI sequence E, Vol. 132 (Nijhoff, 1987) ; and, "Nonlinear Optics and Optical Computing", S. Martellucci and A. N. Chester, Eds. , E. Majorana Int'! technological know-how sequence, Vol. forty nine (plenum, 1990).

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If three beams of different frequency and appropriate polarization are almost phase-matched for sum or difference frequency generation, nonlinear phase shifts can occur for all interacting beams. These second order processes which mimic third order nonlinearities, seem able to produce large phase shifts without saturation and should be very interesting for making devices 135. Large nonlinear phase modulation in quasi-phase-matched KTP waveguides as a result of this process has recently been demonstrated 136 • References 1.

In the presence of a nonlinear medium, when the guided-wave power increases as the guided wave grows under the base of the prism, J3 changes, synchronism with the external field is lost, and the coupling efficiency is reduced. If the coupling is optimized at low excitation levels, an increase in the incident power will cause a reduction in the efficiency with distortion in the angular profile, a shift of the optimum coupling angle, and changes in the beam profile (see Fig. 15). The original coupling conditions can be recovered in some cases by readjusting the coupling angle.

The inset figures represent the fields at the labeled points. 36 M. 8 -1. 2 -1 Fig. 12. Dispersion curves for TEo mode for several values of V. Inset: mode profiles with V = 3. 12 and 13. All dispersion curves in this system have negative slope < O. Mode profiles of these waves, shown in the insets, always have peaks inside the film because the self- defocusing effect only causes the difference n f - nc to be even sharper and the guiding effect to be enhanced. Furthermore, the induced index profile of the whole waveguide has a W shape, which is an interesting and potentially useful feature.

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