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Title: Fourier-transform spectroscopy using an Er-doped fiber femtosecond laser by sweeping the pulse repetition rate
Authors: Lee, Keunwoo
Lee, Joohyung
Jang, Yoon-Soo
Han, Seongheum
Jang, Heesuk
Kim, Young-Jin
Kim, Seung-Woo
Issue Date: 2015
Source: Lee, K., Lee, J., Jang, Y.-S., Han, S., Jang, H., Kim, Y.-J., et al. (2015). Fourier-transform spectroscopy using an Er-doped fiber femtosecond laser by sweeping the pulse repetition rate. Scientific Reports, 5, 15726-.
Series/Report no.: Scientific Reports
Abstract: Femtosecond lasers allow for simultaneous detection of multiple absorption lines of a specimen over a broad spectral range of infrared or visible light with a single spectroscopic measurement. Here, we present an 8-THz bandwidth, 0.5-GHz resolution scheme of Fourier-transform spectroscopy using an Er-doped fiber femtosecond laser. A resolving power of 1.6 × 104 about a 1560-nm center wavelength is achieved by sweeping the pulse repetition rate of the light source on a fiber Mach-Zehnder interferometer configured to capture interferograms with a 0.02-fs temporal sampling accuracy through a well-stabilized 60-m unbalance arm length. A dual-servo mechanism is realized by combining a mechanical linear stage with an electro-optic modulator (EOM) within the fiber laser cavity, enabling stable sweeping control of the pulse repetition rate over a 1.0-MHz scan range with 0.4-Hz steps with reference to the Rb clock. Experimental results demonstrate that the P-branch lines of the H13CN reference cell can be observed with a signal-to-noise ratio reaching 350 for the most intense line.
ISSN: 2045-2322
DOI: 10.1038/srep15726
Schools: School of Mechanical and Aerospace Engineering 
Rights: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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