Observation of long turn-on delay in pulsed quantum cascade lasers

E. D. Cherotchenko; V. V. Dudelev; D. A. Mikhailov; S. N. Losev; A. V. Babichev; A. G. Gladyshev; I. I. Novikov; A. V. Lutetskiy; D. A. Veselov; S. O. Slipchenko; N. A. Pikhtin; L. Ya. Karachinsky; D. V. Denisov; V. I. Kuchinskii; E. A. Kognovitskaya; A. Yu. Egorov; R. Teissier; A. N. Baranov; G. S. Sokolovskii

doi:10.1109/JLT.2021.3134837

paper

Observation of long turn-on delay in pulsed quantum cascade lasers

arXiv:2106.13658 · doi:10.1109/JLT.2021.3134837

Abstract

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 $μ$ m. 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.