用于低压气相分析的异步光学采样太赫兹时域光谱中光谱分辨率和精度的提高。

Enhancement of spectral resolution and accuracy in asynchronous-optical-sampling terahertz time-domain spectroscopy for low-pressure gas-phase analysis.

作者信息

Yasui Takeshi, Kawamoto Kohji, Hsieh Yi-Da, Sakaguchi Yoshiyuki, Jewariya Mukesh, Inaba Hajime, Minoshima Kaoru, Hindle Francis, Araki Tsutomu

机构信息

Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan.

出版信息

Opt Express. 2012 Jul 2;20(14):15071-8. doi: 10.1364/OE.20.015071.

DOI:10.1364/OE.20.015071

PMID:22772203

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.

摘要

通过检测低压气相样品，对异步光学采样太赫兹时域光谱（ASOPS-THz-TDS）的光谱分辨率和精度进行了评估。使用两台56兆赫兹的掺铒锁模飞秒光纤激光器，将光谱分辨率提高到了低至50.5兆赫兹，光谱精度提高到了低至6.2×10⁻⁶。结果表明，ASOPS-THz-TDS有潜力同时实现高光谱分辨率、高光谱精度和宽光谱覆盖。ASOPS-THz-TDS将为大气气体分析领域中多种化学物质的气相光谱学打开一扇新的大门。