title: Enhancement of spectral resolution and accuracy in asynchronous-optical-sampling terahertz time-domain spectroscopy for low-pressure gas-phase analysis.
abstract: The spectral resolution and accuracy of asynchronous-optical-sampling terahertz time-domain spectroscopy (ASOPS-THz-TDS) were evaluated by examining low-pressure gas-phase samples. Use of dual 56-MHz, erbium (Er)-doped, mode-locked femtosecond fiber lasers enhanced the spectral resolution to as low as 50.5 MHz and the spectral accuracy to as low as 6.2 × 10(-6). The results indicate that ASOPS-THz-TDS has the potential to achieve high spectral resolution, high spectral accuracy, and wide spectral coverage at the same time. ASOPS-THz-TDS will open a new door to gas-phase spectroscopy of multiple chemical species in the field of atmospheric gas analysis.
authors: Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan. yasui@me.tokushima-u.ac.jp
authors: Takeshi
authors: T
authors: Yasui
authors: Kohji
authors: K
authors: Kawamoto
authors: Yi-Da
authors: YD
authors: Hsieh
authors: Yoshiyuki
authors: Y
authors: Sakaguchi
authors: Mukesh
authors: M
authors: Jewariya
authors: Hajime
authors: H
authors: Inaba
authors: Kaoru
authors: K
authors: Minoshima
authors: Francis
authors: F
authors: Hindle
authors: Tsutomu
authors: T
authors: Araki