Analysis of turn-on delay of quantum cascade lasers under pulsed pumping with linear front edge

Kusakina, K.V.; Sokolovskiĭ, G. S.

doi:10.1109/iclo54117.2022.9839873

Cited by 1 publication

(1 citation statement)

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“…The simplified analytic fails when the pumping differs from the step-like. The attempts to build the analytical model are discussed in [14], however the comparison with the experiment still remains insufficient. Closer look to the system of equations reveal the following reasons for that: the first one is irrelevant description of the lowest state, namely: the population of carriers in the lowest level does not participate in any physical process.…”

Section: Introductionmentioning

confidence: 99%

QCL dynamics: thermal effects and rate equations beyond mean-field approach

Vrubel¹,

Cherotchenko²,

Miskovets³

et al. 2022

Preprint

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The correct accounting for thermal effects is always a challenge when one needs to make quantitative predictions for any laser applications. In such complicated devices as quantum cascade lasers temperature strongly affects the operational conditions preventing reaching the CW mode as well as effective device performance in pulsed regime. Rate equations are the most effective and simple way to model lasing dynamics. However the conventional approaches operate under the mean-field approximation, considering finite number of population levels and generalizing the obtained results to the infinite number of cascades. The last may lead to unavoidable non-physical results and difficulties in making quantitative predictions. In this work we modify the conventional three-level rate equation approach by adding self-heating description and applying it to the calculation of QCL dynamics. As a result we disclose the importance of temperature affecting the threshold characteristics and build-up time and include electronic aspects to the description of QCL.

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Section: Introductionmentioning

confidence: 99%