A technique for phase correction in Fourier transform spectroscopy

P. Artsang; P. Pongchalee; K. Palawong; C. Buisset; P. Meemon

doi:10.1117/12.2300966

5 March 2018 A technique for phase correction in Fourier transform spectroscopy

P. Artsang, P. Pongchalee, K. Palawong, C. Buisset, P. Meemon

Proceedings Volume 10714, Third International Conference on Photonics Solutions (ICPS2017); 107140U (2018) https://doi.org/10.1117/12.2300966
Event: Third International Conference on Photonic Solutions, 2017, Pattaya, Thailand

Abstract

Fourier transform spectroscopy (FTS) is a type of spectroscopy that can be used to analyze components in the sample. The basic setup that is commonly used in this technique is “Michelson interferometer”. The interference signal obtained from interferometer can be Fourier transformed into the spectral pattern of the illuminating light source. To experimentally study the concept of the Fourier transform spectroscopy, the project started by setup the Michelson interferometer in the laboratory. The implemented system used a broadband light source in near infrared region (0.81-0.89 μm) and controlled the movable mirror by using computer controlled motorized translation stage. In the early study, there is no sample the interference path. Therefore, the theoretical spectral results after the Fourier transformation of the captured interferogram must be the spectral shape of the light source. One main challenge of the FTS is to retrieve the correct phase information of the inferferogram that relates with the correct spectral shape of the light source. One main source of the phase distortion in FTS that we observed from our system is the non-linear movement of the movable reference mirror of the Michelson interferometer. Therefore, to improve the result, we coupled a monochromatic light source to the implemented interferometer. We simultaneously measured the interferograms of the monochromatic and broadband light sources. The interferogram of the monochromatic light source was used to correct the phase of the interferogram of the broadband light source. The result shows significant improvement in the computed spectral shape.

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P. Artsang, P. Pongchalee, K. Palawong, C. Buisset, and P. Meemon "A technique for phase correction in Fourier transform spectroscopy", Proc. SPIE 10714, Third International Conference on Photonics Solutions (ICPS2017), 107140U (5 March 2018); https://doi.org/10.1117/12.2300966

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KEYWORDS

Fourier transforms

Michelson interferometers

Spectroscopy

Fourier spectroscopy

Temporal coherence

Signal detection

Nonuniformity corrections

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