Terahertz Spectroscopy with Gigahertz Frequency Resolution
Terahertz radiation shows strong dependence on water content. Also many gases, molecules, and solid-state samples exhibit a unique fingerprint in this frequency range. Therefore terahertz radiation is useful for biomedical imaging or gas sensing.
Terahertz spectroscopy, based on asynchronous optical sampling (ASOPS), combines high data acquisition rates with simultaneous access to amplitude and phase information. This enables low-noise, high-precision terahertz spectroscopy with gigahertz frequency resolution. Thus, high data acquisition rates are achievable since there is no need for a mechanical delay between the two lasers that are normally required to sample the terahertz signal.
In a paper entitled “Kilohertz pixel scanning rates meet terahertz spectroscopic imaging”, the authors demonstrate their technique, which uses two lasers produced by Laser Quantum as part of the experimental setup.
To read this paper, click here.
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