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We demonstrated a frequency measurement of CW-THz wave referring to THz frequency comb. Effectiveness of the proposed method is demonstrated by measurement of sub-THz test sources. The achieved precision of frequency measurement was 2.0∗10−11.
We demonstrated gapless THz comb spectroscopy for high-resolution THz spectroscopy. Frequency sweeping of THz comb mode enables us to enhance the spectral resolution in THz spectroscopy down to the linewidth of THz comb mode.
The fine-structured spectrum of a terahertz (THz) frequency comb has been observed using asynchronous-optical-sampling THz time-domain spectroscopy with an extended time window covering multiple THz pulses. Fourier transformation of 10 consecutive THz pulses enables us to obtain the spectrum of THz comb mode having a linewidth of 25 MHz at intervals of 250 MHz. Further expansion of time window up...
We demonstrate phase-slope measurement of tunable CW-THz radiation by photoconductive heterodyne detection with a photocarrier THz comb. Distance of optically rough object is determined from the measured phase-slope within accuracy of 100 μm.
We developed a fiber-based, asynchronous-optical-sampling THz-TDS system by combination of mode-locked Er-fiber lasers and photoconductive antennas. Detail structure of the THz comb was clearly observed with a spectral resolution of 5.6 MHz.
We proposed a method to determine the absolute distance of a distant target using asynchronous-optical-sampling terahertz impulse radar. The determined distance was good agreement with the actual distance measured by a scale.
We proposed a novel method of phase measurement of terahertz intermode beat in optical frequency comb, to enhance the dynamic-range of distance meter. Utilizing nonlinear optical process, distance measurement with 130GHz equivalent frequency was realized.
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