Jasper Riebesehl

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.

The demand for infrared (IR) spectroscopy and hyperspectral microscopy within the 5–12 μm range is steadily increasing, especially for achieving high-resolution spectral imaging of biological samples.1 The measurements of vibrational absorption lines in biomolecules, such as lipids, proteins, and amides, without the need for staining, hold great potential in biomedical research.2,3 The specificity, abundance, and distribution of biomolecules in tissue samples facilitate quantitative cancer...

The mid-infrared wavelength band (2–20 µm) is of great significance in trace gas sensing, environmental monitoring, and medical diagnostics since it encompasses the absorption bands of greenhouse gases and the vibrational absorption peaks of biological and chemical molecules.1,2 Efforts have been made to develop MIR spectroscopy devices for chemical and biological sensing systems.3–5 It is remarkable that photonic integrated circuit (PIC) offers a practical and feasible way for creating...