Cavity-enhanced direct frequency comb spectroscopy
171 citations recorded by the source corpus.
Cavity-enhanced direct frequency comb spectroscopy combines broad spectral bandwidth, high spectral resolution, precise frequency calibration, and ultrahigh detection sensitivity, all in one experimental platform based on an optical frequency comb interacting with a high-finesse optical cavity. Precise control of the optical frequency comb allows highly efficient, coherent coupling of individual comb components with corresponding resonant modes of the high-finesse cavity. The long cavity lifetime dramatically enhances the effective interaction between the light field and intracavity matter, increasing the sensitivity for measurement of optical losses by a factor that is on the order of the cavity finesse. The use of low-dispersion mirrors permits almost the entire spectral bandwidth of the frequency comb to be employed for detection, covering a range of ∼ 10% of the actual optical frequency. The light transmitted from the cavity is spectrally resolved to provide a multitude of detection channels with spectral resolutions ranging from several gigahertz to hundreds of kilohertz. In this review we will discuss the principle of cavity-enhanced direct frequency comb spectroscopy and the various implementations of such systems. In particular, we discuss several types of UV, optical, and IR frequency comb sources and optical cavity designs that can be used for specific spectroscopic applications. We present several cavity-comb coupling methods to take advantage of the broad spectral bandwidth and narrow spectral components of a frequency comb. Finally, we present a series of experimental measurements on trace gas detections, human breath analysis, and characterization of cold molecular beams. These results demonstrate clearly that the wide bandwidth and ultrasensitive nature of the femtosecond enhancement cavity enables powerful real-time detection and identification of many molecular species in a massively parallel fashion.
Subfields: Atomic and Molecular Physics, and Optics, Spectroscopy
View Paper: https://www.semanticscholar.org/paper/73d11cd775f5ae07c43ca1032d9a35f8f1823d1c
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In Atomic and Molecular Physics, and Optics
In Spectroscopy
Citations in the corpus
- Cold and ultracold molecules: science, technology and applications (2009, methodology): “Optical frequency comb systems have been used to perform detailed molecular structure studies [408, 409].”
- Optical gas sensing: a review (2012, background): “Nonlinear frequency conversion has enabled comb generation from the UV to the far IR, with the important mid IR region including DFG and OPO based generation [246].”
- Mid-infrared dual-comb spectroscopy with 2.4 μm Cr2+:ZnSe femtosecond lasers (2010, background): “Dramatic advances in molecular science are now foreseen for new spectroscopic methods based on frequency combs [3-18].”
- High-performance near- and mid-infrared crystalline coatings (2016, background): “Cavity-enhanced direct frequency comb spectroscopy (CEDFCS) has recently emerged as a powerful and versatile tool for sensitive and multiplexed spectroscopy in the MIR spectral region, having first been demonstrated in the NIR [29].”