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Frequency noise correlation between the offset frequency and the mode spacing in a mid-infrared quantum cascade laser frequency comb

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Academic year: 2021

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Figure

Fig. 1. Scheme of the experimental setup implemented to measure the frequency noise of the unknown free-running offset f0 of the QCL comb
Fig. 2. Frequency noise power spectral density (FN-PSD) separately measured for an optical mode ν N (pink), for the mode spacing up-scaled to the optical frequency (N · f FSR , blue) and indirectly assessed for the offset signal f 0 (green)
Fig. 3. Frequency dependence of the sum of the complex coherences Γ ∆ between the frequency variations of f 0 and f FSR in the free-running QCL comb
Fig. 4. Transfer function in amplitude (a) and phase (b) of N · f FSR (blue), f 0 (green) and ν N (optical line, pink) measured for a modulation of the QCL current applied through its driver.
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