AI Article Synopsis
- A rapid scanning terahertz (THz) spectrometer has been developed using a synchronized two-fiber-laser system, allowing for quick acquisition of THz spectra extending to 3 THz in just 1 μs with high signal-to-noise ratios.
- The system showcases a dynamic range exceeding 60 dB through signal averaging, and it can detect frequency components beyond 4 THz, demonstrating its versatility in different spectroscopic applications.
- A comparison between THz emission spectra from a 780 nm pumped photoconductive switch and a 1550 nm excited nonlinear DAST crystal reveals enhanced spectral range at higher frequencies, while the dynamic range remains consistent.
Article 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 THz can be acquired within 1 μs 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 dB, and frequency components of more than 4 THz can be detected. When the lasers are set to the same repetition rate, electronically controlled optical sampling at a rate of 2.5 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 nm and a nonlinear DAST crystal excited at 1550 nm. We find that the spectral range of the spectrometer is significantly enhanced at higher frequencies, while the dynamic range remains constant.
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| http://dx.doi.org/10.1364/OL.35.003799 | DOI Listing |
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