A dual-comb heterodyne setup with a mid-infrared femtosecond local oscillator directly records the temporal electric field of quantum cascade laser combs, showing near-ideal frequency modulation for a fundamental comb and a hybrid amplitude/frequency modulation for a harmonic comb.
Optical pulse generation using Fabry-Pérot lasers under continuous-wave operation,
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Heterodyne coherent detection of the electric field temporal trace emitted by frequency-modulated comb lasers
A dual-comb heterodyne setup with a mid-infrared femtosecond local oscillator directly records the temporal electric field of quantum cascade laser combs, showing near-ideal frequency modulation for a fundamental comb and a hybrid amplitude/frequency modulation for a harmonic comb.