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It has been found that noise-induced excitability in quantum well and quantumdot semiconductor laser systems usually produces spike patterns of non-uniformamplitude. In this letter, we experimentally record that an inter-subbandquantum cascade laser injected with a monochromatic laser exhibits a series ofhighly-uniform spike trains in the time domain. Theoretical analysisdemonstrates that such high uniformity has its origin in the ultrashort carrierlifetime of the quantum cascade laser gain medium that is typically close toone picosecond.

Radically Uniform Spike Trains in Optically Injected Quantum Cascade Oscillators