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 can be acquired within at a signal-to-noise ratio of the electric field of better than 20. Signal averaging results in a dynamic range of more than , and frequency components of more than can be detected. When the lasers are set to the same repetition rate, electronically controlled optical sampling at a rate of 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 and a nonlinear DAST crystal excited at . 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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