All-Optical Noninvasive Delayed Feedback Control of by Sylvia Schikora

By Sylvia Schikora

​The stabilization of risky states hidden within the dynamics of a process, particularly the regulate of chaos, acquired a lot awareness within the final years. during this paintings, a widely known regulate strategy 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 regulate sign is a phase-tunable superposition of the laser sign, and provokes the laser to function in an another way volatile periodic kingdom with a interval equivalent to the time hold up. The keep watch over is noninvasive, as the mirrored sign has a tendency to 0 whilst the objective country is reached.

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On the left side, the highly divergent output is coupled into a tapered fiber and used for analysis. On the right side, collimation with a sapphire ball lens enables the additional coupling of a FP cavity. was calculated by Dr. Güther to (78 ± 7) μm. 2 ps. 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.

Sufficient stabilization of the gap between laser and FP is achieved with an internally damped breadboard lying on a base frame of piled styrofoam with lightly inflated rubber hoses on top (thanks to advice from the staff of the coherence optics lab in the Department of Physics, Humboldt-University of Berlin). The damping capability of this construction was tested with a Michelson interferometer, and found sufficient. Fig. 13 shows a photograph of the realized experiment. Analysis The extracted laser emission is analyzed by an optical power meter, a FP spectrometer, and a 40 GHz electrical spectrum analyzer (ESA).

8. 1 V steps with otherwise fixed parameters. Fig. 9 summarizes the dependence of the main RO parameters on ϕ. The hatched area marks the regions of coherence control. Under control, the peak width is decreased compared to the freerunning value. 3 Summary 41 At the same time, the RO amplitude is increased and the relative transmission is high, indicating a minimal reflected signal. 4 of a phase period. They are separated by a region of low FP transmission where the RO are suppressed by the feedback.

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