Abstract
We demonstrate a high-speed terahertz (THz) waveform measurement system for intense THz light with a scan rate of 100 Hz. To realize the high scan rate, a loudspeaker vibrating at 50 Hz is employed to scan the delay time between THz light and electro-optic sampling light. Because the fast scan system requires a high data sampling rate, we develop an Yb-doped fiber laser with a repetition rate of 100 kHz optimized for effective THz light generation with the output electric field of 1 kV/cm. The present system drastically reduces the measurement time of the THz waveform from several minutes to 10 ms.
Highlights
Terahertz (THz) light is used for the inspection of semiconductor devices and biological tissue and for security and other applications [1,2,3,4,5,6,7,8]
THz time-domain spectroscopy (THz-TDS) is widely used as a sensitive and accurate method to obtain both THz waveforms and its Fourier transform spectra of THz light. Using this advantage of THz-TDS, a time-of-flight THz tomography has been developed for measurement of layer structures near the surface [9]
We have developed an advanced method to achieve high-speed measurement of the THz waveform with intense THz light
Summary
Terahertz (THz) light is used for the inspection of semiconductor devices and biological tissue and for security and other applications [1,2,3,4,5,6,7,8]. To realize high-speed THz waveform measurements with intense THz light, single-shot measurements of the waveform without time-domain scan have been proposed. The scan rate of these promising methods depends on the laser’s repetition rate and the data accumulation time and is typically 1 to 10 Hz. In this study, we have developed an advanced method to achieve high-speed measurement of the THz waveform with intense THz light. To realize the high-speed measurement of the THz waveform with intense THz light and to apply it to practical study such as the THz hyperspectral imaging, we thoroughly design the total system and optimize well-known technical components, e.g., an Yb-doped fiber laser, a loudspeaker scanner, a THz-TDS system, and so on.
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