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http://dx.doi.org/10.3807/HKH.2008.19.5.370

High-Speed High-Resolution Terahertz Time-Domain Spectrometer  

Kim, Young-Chan (Safety Metrology Center, Korea Research Institute of Standards and Science)
Kim, Ki-Bok (Safety Metrology Center, Korea Research Institute of Standards and Science)
Yee, Dae-Su (Safety Metrology Center, Korea Research Institute of Standards and Science)
Yi, Min-Woo (Dept. of Physics, Korea Advanced Institute of Science & Technology)
Ahn, Jae-Wook (Dept. of Physics, Korea Advanced Institute of Science & Technology)
Publication Information
Korean Journal of Optics and Photonics / v.19, no.5, 2008 , pp. 370-375 More about this Journal
Abstract
High-speed high-resolution terahertz time-domain spectroscopy (THz-TDS) is demonstrated using the asynchronous-opticalsampling (AOS) method. A time-domain signal with a 10-ns time window is rapidly acquired by using two femtosecond lasers with slightly different repetition frequencies to generate and detect a terahertz pulse wave, without a mechanical delay stage. The spectrum obtained by the fast Fourier transformation (FFT) of the time-domain waveform has a frequency resolution of 100 MHz. The time resolution of our spectrometer is measured using the cross-correlation method to be 278 fs. A transmission spectrum of water vapor is measured and the absorption lines are analyzed in the frequency range from 0.1 to 1.2 THz.
Keywords
Terahertz electromagnetic wave; Terahertz time-domain spectroscopy(THz-TDS); Asynchronous optical sampling(AOS);
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