Speaker
Dr
Piotr Maslowski
(Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, ul. Grudziadzka 5, 87-100 Torun, Poland)
Description
Absorption spectroscopy based on optical frequency comb (OFC) [1] allows measurements of absorption spectra in wide spectral range with high signal-to-noise ratios. It removes the limits of cw-laser spectroscopy caused by its step-like operation and usually limited tuning range.
Fourier transform spectrometers (FTS) based on OFCs allow detection of broadband spectra within acquisition times orders of magnitude shorter than traditional FTIRs based on thermal sources [2]. Moreover, the resolution of OFC-based FTS is not limited by the maximum optical path difference (OPD) between the interferometer’s arms [3], shown reaching the levels of single kHz [4]. On the other hand, the setups based on dispersive elements and detector arrays [5, 6], have the advantage of fast acquisition, down to single microseconds, making it perfect for the detection of transient species [7]. In both cases the sensitivity can be increased by coupling the OFC light to the optical enhancement cavities [8].
These properties make the technique suitable for fast acquisition of tens of absorption lines of multiple species simultaneously. In the talk the technique of comb-based measurements with multiple approaches will be presented in the context of the measurement system for fast and broadband plasma diagnostic.
References:
1. P. Masłowski, Cossel, K. C. , Foltynowicz, A. , and Ye, J. , Springer Series in Optical Sciences: Cavity-Enhanced Spectroscopy and Sensing: Cavity-Enhanced Direct Frequency Comb Spectroscopy, vol. 179. Springer, Berlin Heidelberg, 2014, pp. 271
2. M. Gołkowski et al. IEEE Trans.Plasma Sci. 40, 1984 (2012).
3. P. Maslowski et al., Phys. Rev. A, 93, 021802(R) (2016)
4. L. Rutkowski et al. in Conference on Lasers and Electro-Optics, OSA Technical Digest (online) (Optical Society of America, 2017), paper SW4J.6.
5. M. J. Thorpe, D. Balslev-Clausen, M. S. Kirchner, and J. Ye,
Opt.Express 16, 2387 (2008).
6. G. Kowzan et al., Opt. Letters 41, 974 (2016)
7. A. J. Fleisher et al., J. Phys. Chem. Lett. 5, 2241 (2014)
8. A. Foltynowicz et al., Phys. Rev. Lett. 107, 233002 (2011)
Primary author
Dr
Piotr Maslowski
(Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, ul. Grudziadzka 5, 87-100 Torun, Poland)
