Related Experiment Video
Updated: May 22, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Phase noise characterization of a Cr:ZnS frequency comb using subspace tracking
Abstract:
We present a comprehensive phase noise characterization of a mid-IR Cr:ZnS frequency comb. Despite their emergence as a platform for high-resolution dual-comb spectroscopy (DCS), detailed investigations into the phase noise of Cr:ZnS combs have been lacking. To address this, we use a recently proposed phase noise measurement technique that employs multi-heterodyne detection and subspace tracking. This allows for the measurement of common mode, repetition rate, and high-order phase noise terms and their corresponding scaling as a function of a comb-line number, using a single measurement setup. We demonstrate that the comb under test is dominated by the common mode phase noise, while all the other phase noise terms are below the measurement noise floor (∼-120 dB rad2/Hz) and are thereby not identifiable.
Related Concept Videos
Time and frequency -Domain Interpretation of Phase-lead Control
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
Atomic Nuclei: Larmor Precession Frequency
Time and frequency -Domain Interpretation of Phase-lag Control
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
Linear Approximation in Frequency Domain
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....

