Naslov
Cavity-enhanced optical frequency comb spectroscopy

Autori
A. Foltynowicz, P. Maslowski, T. Ban, K. C. Cossel, and J. Ye

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of abstracts / - , 2011

Skup
User Meeting and Summer School Cavity Enhanced Spectroscopy

Mjesto i datum
Kingston, Kanada, 26.06.2011. - 29.06.2011

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
frequency comb; cavity enhanced spectroscopy

Sažetak
Optical frequency combs are produced by mode-locked lasers, whose spectrum spans hundreds of terahertz of bandwidth and consists of a series of equidistant narrow lines with frequencies given by, where is the repetition rate of the laser and is the carrier envelope offset frequency. The two radio frequencies can be directly measured and adjusted, providing full control over each individual comb line and making the frequency combs an excellent tool for precision metrology. In spectroscopy, the frequency combs can be used as frequency reference for continuous wave laser measurements, or, more powerfully, to perform the measurements directly. Direct frequency comb spectroscopy (DFCS), which is virtually equivalent to a simultaneous measurement with tens of thousands of narrow laser lines, combines the large spectral bandwidth of the comb with the high resolution of each comb line, allowing simultaneous detection of many molecular trace species . Moreover, the equidistant spectrum of the comb can be matched to that of an external enhancement cavity, providing efficient coupling and enhancement of the interaction length with the sample. Due to the dispersion in the cavity mirrors, the free spectral range of a cavity varies as a function of optical frequency, which usually prevents simultaneous coupling of the entire comb spectrum into the cavity. Another issue is the laser frequency-to-amplitude noise conversion, which plagues all cavity-enhanced techniques. Various detection methods and comb-to-cavity coupling schemes have been developed to overcome these two limitations, allowing cavity-enhanced (CE-) DFCS to reach sensitivities in the 10*(^-10) cm-1 Hz-1/2 range. Due to the combination of high sensitivity, broad spectral bandwidth, high resolution and fast acquisition times CE-DFCS has the potential of becoming the ultimate tool for applications such as precision spectroscopy and trace gas detection for breath analysis or atmospheric research.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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