Abstract

We have developed a rapid scanning terahertz (THz) spectrometer based on a synchronized two-fiber-laser system. When the system is set to the asynchronous optical sampling mode, THz spectra extending to $3\mathrm{THz}$ can be acquired within $1\mu \mathrm{s}$ at a signal-to-noise ratio of the electric field of better than 20. Signal averaging results in a dynamic range of more than $60\mathrm{dB}$, and frequency components of more than $4\mathrm{THz}$ can be detected. When the lasers are set to the same repetition rate, electronically controlled optical sampling at a rate of $2.5\mathrm{kHz}$ is demonstrated, making the system versatile for different spectroscopic applications. Finally, we compare the THz emission spectra of a photoconductive switch that is pumped at $780\mathrm{nm}$ and a nonlinear DAST crystal excited at $1550\mathrm{nm}$. We find that the spectral range of the spectrometer is significantly enhanced at higher frequencies, while the dynamic range remains constant.

© 2010 Optical Society of America

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