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Proceedings Paper

A loss-compensated fiber loop available for short-pulse lasers and its application in water detection
Author(s): Jin Hwan Kim; Seung Ryeol Oh; Chanh D. Tr. Nguyen; Kyung-Soo Kim; Soohyun Kim
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Paper Abstract

The concentration of trace sample can be determined by, and therefore an indicator of, the absorption property in fiber-loop ring-down spectroscopy. The aim of this study was to investigate the use of an ultrashort-pulse laser as a source of the fiber-loop ring-down spectroscopy and its applicability for loss-compensated fiber loops. A composite-type carbon-nanotube saturable absorber mode-locked fiber laser was built to be used as a source of experimental setup. The simulation has been done to check dispersion effects on ring-down signals, and it was found that the initial pulse duration affected ring-down information. To avoid this limitation, we just used the chirped pulses without any compensation process in the experiment. A loss-compensated fiber loop was constructed to measure the concentration of water in water/acetone mixture samples. The measurements were shown to lead to an accurate determination of the ring-down time. The result indicates that it is possible to measure the sample-induced absorption with the ultrashort-pulse laser source and loss-compensated fiber loop to determine the concentration of the sample.

Paper Details

Date Published: 4 March 2015
PDF: 7 pages
Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 93442J (4 March 2015); doi: 10.1117/12.2074569
Show Author Affiliations
Jin Hwan Kim, KAIST (Korea, Republic of)
Seung Ryeol Oh, KAIST (Korea, Republic of)
Chanh D. Tr. Nguyen, KAIST (Korea, Republic of)
Kyung-Soo Kim, KAIST (Korea, Republic of)
Soohyun Kim, KAIST (Korea, Republic of)


Published in SPIE Proceedings Vol. 9344:
Fiber Lasers XII: Technology, Systems, and Applications
L. Brandon Shaw, Editor(s)

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