Observation of Long Turn-On Delay in Pulsed Quantum Cascade Lasers

We present an experimental study of the turn-on delay in pulsed mid-infrared quantum cascade lasers. We report the unexpectedly long delay time depending on the pumping current, which does not agree with conventional theoretical predictions for step-like excitation. Similar behavior has been observe...

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Veröffentlicht in:	Journal of lightwave technology 2022-04, Vol.40 (7), p.2104-2110
Hauptverfasser:	Cherotchenko, E. D., Dudelev, V. V., Mikhailov, D. A., Losev, S. N., Babichev, A. V., Gladyshev, A. G., Novikov, I. I., Lutetskiy, A. V., Veselov, D. A., Slipchenko, S. O., Pikhtin, N. A., Karachinsky, L. Ya, Denisov, D. V., Kuchinskii, V. I., Kognovitskaya, E. A., Egorov, A. Yu, Teissier, R., Baranov, A. N., Sokolovskii, G. S.
Format:	Artikel
Sprache:	eng
Schlagworte:	Current measurement Current pulses Delay time Delays Engineering Sciences Excitation Infrared lasers Mathematical models pulsed pumping Quantum cascade lasers Scattering Shape Threshold current turn-on delay
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Beschreibung
Zusammenfassung:	We present an experimental study of the turn-on delay in pulsed mid-infrared quantum cascade lasers. We report the unexpectedly long delay time depending on the pumping current, which does not agree with conventional theoretical predictions for step-like excitation. Similar behavior has been observed in InP- and InAs-based QCLs emitting near 8 \mum. Numerical simulations performed using a model based on rate equations for excitation by current pulses with non-zero rise time provide fair agreement with our observations.
ISSN:	0733-8724 1558-2213
DOI:	10.1109/JLT.2021.3134837