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
TL;DR
This paper investigates the unexpectedly long turn-on delay in pulsed quantum cascade lasers, revealing discrepancies with traditional models and supporting findings through numerical simulations based on rate equations.
Contribution
It provides the first experimental observation of long turn-on delays in pulsed QCLs and introduces a rate equation model that explains this behavior.
Findings
Long turn-on delays depend on pumping current.
Conventional models do not predict these delays.
Numerical simulations align with experimental results.
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 8m. 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.
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