Gianni Di Domenico

TL;DR: A simple approach to this relation with an approximate formula for evaluation of the laser linewidth that can be applied to arbitrary noise spectral densities is presented.

TL;DR: The fractional frequency stability of the CEO-beat is 20‑fold better than measured in a standard self-referenced commercial fiber comb system and contributes only 10(-15) to the optical carrier frequency instability at 1 s averaging time.

TL;DR: An experimental validation of a much simpler geometrical approximation applicable to any arbitrary frequency noise spectrum using laser sources of different spectral characteristics finds a very good agreement between the approximate and directly measured linewidths.

TL;DR: A radio-frequency discriminator based on a voltage-controlled oscillator phase-locked to the signal under test, which has been developed to analyze the frequency noise properties of an RF signal, e.g., a heterodyne optical beat signal between two lasers or between a laser and an optical frequency comb is described.

TL;DR: In this article, the wavelength tuning response for direct current modulation of two mid-IR QCLs from different suppliers was measured from 10 Hz up to several MHz using ro-vibrational molecular resonances as frequency-to-intensity converters.