Dynamic Scenarios in Two-State Quantum Dot Lasers: Excited by André Röhm

By André Röhm

André Röhm investigates the dynamic houses of two-state lasing quantum dot lasers, with a spotlight on flooring nation quenching. With a unique semi-analytical method, varied quenching mechanisms are mentioned in an unified framework and confirmed with numerical simulations. The identified 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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The GS intensity starts to decline after the onset of ES lasing, while the slope of the overall intensity stays roughly the same. c (2015) IEEE. Reprinted, with permission, from [ROE14] First, while two-state lasing has also been observed for InAs/InP QDs [VES07], GS quenching is unique to self-assembled InAs/GaAs QDs as far as the author knows. However, this is also caused by the small numbers of papers published on this topic. From a pure performance perspective GS quenching might seem like a defect, so some additional experimental observation might have been discarded or not deemed publishable.

Denoting the commutator as shown above. Hence, for the time evolution of the observables in Eq. 33) the commutator with the Hamiltonian has to be evaluated. This is a tedious calculation, which will not be shown here, where the anticommutator relation for fermions has to be used several times: a†m , an := a†m an + an a†m = δmn . 37) where ωαj βj is the frequency of the transition αj -βj . Then, the microscopic polarization p˜αj βj amplitude can be transformed into a new variable pαj βj , describing the slowly varying amplitude in a rotating frame with the same frequency ω as the incoming electric field: p˜αj βj =: pαj βj e−iωt .

Detailed balance, on the other hand, is fully maintained. 28 3 Modes of Operation of QD Lasers 3. 1. Single Colour Laser Before delving into the dual-colour or two-state lasing aspects of the QD laser model introduced in the previous section, this section will shortly review the single-colour dynamics of a QD laser. This is done by setting the ES gain gES = 0, so that only GS lasing is achieved. Then, the ES simply acts as an intermediate reservoir for the carriers. 1: Light-current characteristic for a single colour lasing QD laser as simulated by the numerical model introduced in section Sec.

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