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A stabilized Fabry-Perot cavity with a 2.2 MHz-linewidth resonance-mode and a 566MHz FSR was fully characterized over the spectral range from 186 to 200 THz by discrete Fourier transform infrared spectroscopy using precisely periodic pulse.
The adaptive sampling clock was extracted by dual THz-comb-referenced spectrum analyzers and used for THz dual comb spectroscopy (THz-DCS) with unstabilized dual lasers. The demonstrated results implied better spectroscopic performance than THz-DCS with stabilized lasers.
It is crucial in asynchronous-optical-sampling THz time-domain spectroscopy or dual THz comb spectroscopy to suppress the timing jitter of the mode-locked frequency between two femtosecond lasers or frequency fluctuation of a beat signal between two THz combs because the fluctuation of them distorts the linearity of frequency scale in the spectrum. In this paper, dual THz spectrum analyzers were effectively...
An accurate, continuously tunable, terahertz synthesizer was proposed by photomixing of two continuous-wave lasers phase-locked to dual optical combs. This synthesizer enables us to perform the precise THz spectroscopy secured by microwave frequency standard.
We demonstrated combination of spectrally interleaved terahertz (THz) frequency comb with dual-comb spectroscopy, enabling us to achieve the spectral sampling equal to linewidth of the comb tooth in the low-pressure gas spectroscopy in THz region.
We proposed frequency-swept asynchronous-optical-sampling terahertz time-domain spectroscopy to further improve the spectral resolution. The spectral resolution achieved here was 2.2 MHz, which is two orders of magnitude smaller than the mode-locked frequency.
We fully interpolated frequency gaps between THz-comb modes by their incremental sweeping at intervals of their linewidth, showing the possibility of enhancing the spectral resolution in THz spectroscopy to the linewidth of THz comb mode.
Two techniques for terahertz (THz) frequency metrology based on frequency comb, namely, a THz-comb-referenced spectrum analyzer and a continuously tunable, single-frequency continuous-wave (CW)-THz generator, are reviewed. Since the frequency comb enables to coherently link the frequency among microwave, optical, and THz regions, it is possible to establish the THz frequency metrology traceable to...
We proposed a fiber-based, asynchronous optical sampling THz time-domain spectroscopy system by combination of mode-locked Er-doped fiber lasers and photoconductive antennas. The proposed system will become a fast, compact, alignment-free, robust, and flexible apparatus without any mechanical moving parts.
We demonstrated real-time, line-field terahertz time-domain spectroscopic (THz-TDS) imaging of a moving object by combined use of electro-optical time-to-space conversion and its one-dimensional imaging. The pixel rate of the proposed system is reached to 2,320 pixel/sec, which is much faster than those of conventional THz-TDS imaging systems.
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