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We compare two methods of wavefront analysis of THz pulses associated with a 2D electro-optic imaging system. The first one is the standard Hartmann sensor, and the second one is based on the well-known fact that EO sampling can record the phase variation of the THz electric field.
We demonstrated a real-time frequency measurement of CW-THz wave using a single free-running THz comb. The absolute frequency of the CW-THz wave is measured with an accuracy of 8.7∗10−12 at a rate of 10 Hz.
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...
We demonstrated a frequency measurement of CW-THz wave referring to dual THz frequency comb in real time. The absolute frequency of the CW-THz wave is measured with an accuracy of 3.5*10−11 10ms each.
A new method for precise frequency measurement of continuous-wave THz wave is proposed by using a THz frequency comb of photocurrent. Precision of the frequency measurement was 2.2??10-11 within the range of 75-110 GHz.
A new method for precise frequency measurement of continuous-wave terahertz (THz) wave is proposed by using a THz frequency comb of photocurrent in a photoconductive antenna for THz detection. Effectiveness of the proposed method is demonstrated by measurement of a test source. Precision of the frequency measurement was 2.2times10-11 within the range of 75-110 GHz.
Bit-by-bit label-recognition for 40-Gbit/s 16-bit burst-mode optical packets is achieved by means of a self-serial-to-parallel conversion system and a CMOS circuit. 1times4 self-routing controlled by 2-ch signals from the label-recognition system is demonstrated
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