Optical fiber-coupled InGaAs-based terahertz time-domain spectroscopy system |
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Authors: | Han Sang-Pil Ko Hyunsung Kim Namje Ryu Han-Cheol Lee Chul Wook Leem Young Ahn Lee Donghun Jeon Min Yong Noh Sam Kyu Chun Hyang Sook Park Kyung Hyun |
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Institution: | THz Photonics Creative Research Center, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700, Korea. |
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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 132 nW, 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. |
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