By Sylvia Schikora
The stabilization of risky states hidden within the dynamics of a procedure, particularly the regulate of chaos, acquired a lot cognizance within the final years. during this paintings, a well known keep an eye on process known as behind schedule suggestions keep watch over is utilized for the 1st time completely 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 risky periodic kingdom with a interval equivalent to the time hold up. The regulate is noninvasive, as the mirrored sign has a tendency to 0 whilst the objective country is reached.
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Additional info for All-Optical Noninvasive Delayed Feedback Control of Semiconductor Lasers
The FP interferometer is realized as a solid etalon. This choice requires an indirect adjustment of the optical emission to the ﬁxed FP, but ensures sufﬁcient stability and a conveniently short travelling time τl between laser and FP. This so-called latency time can be reduced to τl = 40 ps, which is of the order of the delay time τ. This is particularly important, as a too large latency would decrease the ability for control. Further, much effort is made to ensure control and stabilization of the latency gap on a subwavelength scale.
However, the stability of the solitary laser mode changes drastically in dependence on the feedback phase ϕ. On tuning ϕ, the small signal dynamics of the laser can be strongly inﬂuenced. When subject to a small disturbance, a cw emitting laser without external feedback shows damped relaxation oscillations (RO) back to the stationary state1 . The effects of additional FP feedback range from weak damping of the RO to overdamping, and also undamping, resulting in a destabilization in a Hopf bifurcation.
With solid etalons, the minimal interspace between laser and cavity is only limited by the necessary optics in the latency path. Another advantage of solid etalons is that they offer a stable FP roundtrip, so that no further attempts for stabilization of the FP phase φ are required. The drawbacks of FP glass etalons are a ﬁnite absorption inside the cavity, a ﬁxed roundtrip time τ and ﬁxed FP resonance frequencies - the optical frequencies which are transmitted by the interferometer. To overcome these limitations, the FP etalons feature negligible absorption, and come in sets of several etalons with different τ.