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 3THz can be acquired within 1μs at a signal-to-noise ratio of the electric field of better than 20. Signal averaging results in a dynamic range of more than 60dB, and frequency components of more than 4THz can be detected. When the lasers are set to the same repetition rate, electronically controlled optical sampling at a rate of 2.5kHz 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 780nm and a nonlinear DAST crystal excited at 1550nm. 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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