New PDF release: All-Optical Noninvasive Delayed Feedback Control of

By Sylvia Schikora

ISBN-10: 365801539X

ISBN-13: 9783658015398

ISBN-10: 3658015403

ISBN-13: 9783658015404

​The stabilization of risky states hidden within the dynamics of a method, specifically the keep watch over of chaos, got a lot awareness within the final years. during this paintings, a well known keep an eye on approach known as not on time suggestions regulate is utilized for the 1st time totally within the all-optical area. A multisection semiconductor laser gets optical suggestions from an exterior Fabry-Perot interferometer. The keep an eye on sign is a phase-tunable superposition of the laser sign, and provokes the laser to function in an differently risky periodic nation with a interval equivalent to the time hold up. The keep watch over is noninvasive, as the mirrored sign has a tendency to 0 while the objective kingdom is reached.

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One question is how to choose the delay time τ when controlling a stationary state. The dynamic system departs from an unstable focus along spirals, with the intrinsic focus period T0 . The control force F should suppress the outwards spiralling movement. The optimal choice for the delay time τopt is equal to half the intrinsic focus period T0 [HS05], τopt = T0 /2 = π/ω. 1) With this choice, a control force F = K(x(t − τ) − x(t)) (gray arrow in Fig. 1 (c)) always points towards the origin of the spiral, to the unstable focus.

Fabry-Perot Etalons Minimization of the latency gap also affects the type of FP interferometer which can be used. Solid FP glass etalons offer direct access to the FP front mirror and can thus be brought much closer to the laser facet than a FP interferometer consisting of two independent mirrors. In the latter case, the unavoidable mounting equipment of the mirrors considerably increases the latency. With solid etalons, the minimal interspace between laser and cavity is only limited by the necessary optics in the latency path.

12: Adjustment of a selfpulsating optical signal to a Fabry-Perot cavity. Optical spectrum of the selfpulsation (dashed lines) and Fabry-Perot reflectivity spectrum (gray line). is satisfied3 . Noninvasive control requires Eq. 3) to be permanently fulfilled, making high demands on the stability of the FP phase φ . Under resonant adjustment the reflectivity of the Fabry-Perot cavity is zero for the optical frequency components of the target state, but for all other frequencies a finite feedback is generated.

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All-Optical Noninvasive Delayed Feedback Control of Semiconductor Lasers by Sylvia Schikora


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