Optical frequency combs were developed nearly two decades ago to support the world's
most precise atomic clocks. Acting as precision optical synthesizers, frequency combs …

Over the past decade, the demonstration of frequency combs has been reported in a wide
range of quantum cascade lasers. These combs have huge potential in applications …

Breath analysis enables rapid, noninvasive diagnostics, as well as long-term monitoring of
human health, through the identification and quantification of exhaled biomarkers. Here, we …

Optical cavities are essential for enhancing the sensitivity of molecular absorption
spectroscopy, which finds widespread high-sensitivity gas sensing applications. However …

Since its invention in 1994, the quantum cascade laser (QCL) has emerged as a versatile
light source of wavelength 4–12 µm, covering most of the mid-and long-wavelength infrared …

The field of attosecond nanophysics, combining the research areas of attosecond physics
with nanoscale physics, has experienced a considerable rise in recent years, both …

Dual-comb spectroscopy can provide broad spectral bandwidth and high spectral resolution
in a short acquisition time, enabling time-resolved measurements. Specifically, spectroscopy …

Chip‐scale, electrically‐pumped terahertz (THz) frequency‐combs (FCs) rely on nonlinear
four‐wave‐mixing processes, and have a nontrivial phase relationship between the evenly …

This Letter presents a 0.4–5.2-µm frequency comb from a compact laser. We designed an
integrated fiber device for a figure-9 laser and constructed an all-fiber laser system. The …

Mid-infrared (MIR) dual-comb spectroscopy (DCS) is a highly effective method for molecular
metrology of rovibrational transition spectra in a quick accurate manner. However, due to …