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http://dx.doi.org/10.3807/KJOP.2017.28.1.022

Time-encoded Near-infrared (NIR) Spectroscopic Comparison of Absorbance Measurement Using an Acousto-optic NIR Swept Laser Source  

Jang, Hansol (Department of Cogno Mechatronics Engineering, Pusan National University)
Kim, Gyeong Hun (Department of Cogno Mechatronics Engineering, Pusan National University)
Han, Ga-Hee (Department of Cogno Mechatronics Engineering, Pusan National University)
Cho, Jaedu (Center for Functional Onco Imaging, University of California at Irvine)
Kim, Chang-Seok (Department of Cogno Mechatronics Engineering, Pusan National University)
Publication Information
Korean Journal of Optics and Photonics / v.28, no.1, 2017 , pp. 22-27 More about this Journal
Abstract
Time-encoded near-infrared spectroscopy (NIRS) system is proposed, based on a near-infrared (NIR) swept laser source, for comparison to the conventional NIRS method using a detector-type spectrometer. The cavity of the NIR swept laser source consists of a semiconductor optical amplifier (SOA) with a gain region around 800 nm, and several fiber-optic components. To change the output wavelength in time using an applied electric radio-frequency signal, an acousto-optic tunable filter (AOTF) is introduced in the fiber ring cavity configuration. To demonstrate the feasibility of an NIR swept laser source for NIRS imaging, the spectroscopic comparison of two kinds of absorbance-measuring systems a detector-type spectrometer using a white light source, and a source-type spectrometer using an NIR swept laser is successfully performed with an NIR-absorbing dye.
Keywords
Swept laser source; Near infrared spectroscopy; Time-encoded spectroscopy;
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