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Optical fiber-coupled InGaAs-based terahertz time–domain spectroscopy system
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- Authors
- Sang-Pil Han, Hyunsung Ko, Namje Kim, Han-Cheol Ryu, Chul Wook Lee, Young Ahn Leem, Donghun Lee, Min Yong Jeon, Sam Kyu Noh, Hyang Sook Chun, Kyung Hyun Park
- Issue Date
- 2011-08
- Citation
- Optics Letters, v.36, no.16, pp.3094-3096
- ISSN
- 0146-9592
- Publisher
- Optical Society of America(OSA)
- Language
- English
- Type
- Journal Article
- Abstract
- The successful demonstration of an optical fiber-coupled terahertz time-domain spectroscopy (THz-TDS) system is described in this study. The terahertz output power of the emitter with two optical band rejection filters was 132nW, which is an improvement of 70% over the output power without any filters. This improvement is due to the suppression of an optical modulated signal that is reverse-generated when an alternating current bias exceeding a certain threshold is applied to the emitter. Under the optimal alignment conditions, the terahertz detector in a fiber-coupled THz-TDS system clearly measured water vapor dips in the free space. © 2011 Optical Society of America.
- KSP Keywords
- Band rejection filters, Fiber-coupled, Modulated signal, Optical band, Output power, Terahertz detector, Water vapor, alternating current(AC), an optical fiber, free space, terahertz time-domain spectroscopy