By André Röhm
André Röhm investigates the dynamic homes of two-state lasing quantum dot lasers, with a spotlight on floor kingdom quenching. With a singular semi-analytical technique, diversified quenching mechanisms are mentioned in an unified framework and confirmed with numerical simulations. The recognized effects and experimental findings are reproduced and parameter dependencies are systematically studied. also, the turn-on dynamics and modulation reaction curves of two-state lasing units are presented.
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André Röhm investigates the dynamic houses of two-state lasing quantum dot lasers, with a spotlight on floor country quenching. With a singular semi-analytical technique, varied quenching mechanisms are mentioned in an unified framework and established with numerical simulations. The identified effects and experimental findings are reproduced and parameter dependencies are systematically studied.
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Extra resources for Dynamic Scenarios in Two-State Quantum Dot Lasers: Excited State Lasing, Ground State Quenching, and Dual-Mode Operation
Because the stimulated emission terms of Eq. 73) have been neglected, Eq. 4) can yield GS occupations that are above the GS gain clamping, which is unphysical. These can be interpreted as GS lasing states, so that the gain clamping equation turns into a threshold conditions and the lasing condition is therefore given by: GS ρGS e + ρh − 1 ≥ κ . 5) After inserting the analytical approximation of Eq. 4) into Eq. 6) is obtained. This Eq. 6) expresses the lasing condition for the GS in terms of ES occupations.
Due to the nature of the growth process they exhibit a stochastic distribution of sizes, which in turn changes their conﬁnements and spectral parameters [BIM08a]. This can be measured as a broadening of the collective spectrum, referred to as ’inhomogeneous broadening’ (see Fig. 7), as compared to the natural linewidth of a single quantum dot (called ’homogeneous broadening’). 7: Sketch of the emission spectrum of an ensemble of QDs. Due to the self-assembled growth process sizes and therefore transition energies are statistically distributed.
C (2015) IEEE. Reprinted, with permission, from [ROE14] The inﬂuence of this asymmetry is shown in Fig. 4. The electron conﬁnement ΔEe was changed from a symmetric case (dark red area) to an increasingly asymmetric one. While for the symmetric case low electron occupations also lead to GS quenching, only the hole depletion side retains solitary ES lasing for the asymmetric energy structures (red, orange, yellow areas). Next, reducing the depth of the conﬁnement for both electrons and holes in Eq.
Dynamic Scenarios in Two-State Quantum Dot Lasers: Excited State Lasing, Ground State Quenching, and Dual-Mode Operation by André Röhm