Influence of femtosecond laser pulse width on performance of terahertz time domain spectrometer

Guo-chao Li; Bin Wu; Yan-zhao Yang; Hong-yuan Liu; Hong-chao Wang

doi:10.1117/12.2506727

7 November 2018 Influence of femtosecond laser pulse width on performance of terahertz time domain spectrometer

Guo-chao Li, Bin Wu, Yan-zhao Yang, Hong-yuan Liu, Hong-chao Wang

Proceedings Volume 10832, Fifth Conference on Frontiers in Optical Imaging Technology and Applications; 108320L (2018) https://doi.org/10.1117/12.2506727
Event: Fifth Conference on Frontiers in Optical Imaging Technology and Applications, 2018, Changchun, China

Abstract

In this paper, a series of experiments on dispersion compensation in terahertz time-domain spectrometers are performed. The Influence of femtosecond laser pulse width on the performance of terahertz time-domain spectrometers is systematically studied. A terahertz time-domain spectroscopy system was constructed using fiber-coupled photoconductive antennas. Through the adjustment of the grating spacing and the replacement of different lengths of fiber cable, the laser pulse width acting on the antenna was multiplexed from 130fs to 2.46ps, and the performance of the terahertz time domain spectroscopy system under different pulse widths was tested. The experimental results show that, with the increase of the femtosecond laser pulse width, the signal intensity of the terahertz time domain waveform and the high frequency part of the terahertz spectrum decrease significantly. Quantitative comparative analysis was performed using the average signal-to-noise ratio, validating the necessity of using dispersion compensation and femtosecond laser pulse width testing in the terahertz time-domain spectroscopy system.

Citation Download Citation

Guo-chao Li, Bin Wu, Yan-zhao Yang, Hong-yuan Liu, and Hong-chao Wang "Influence of femtosecond laser pulse width on performance of terahertz time domain spectrometer", Proc. SPIE 10832, Fifth Conference on Frontiers in Optical Imaging Technology and Applications, 108320L (7 November 2018); https://doi.org/10.1117/12.2506727

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KEYWORDS

Terahertz spectroscopy

Antennas

Spectroscopy

Signal to noise ratio

Terahertz radiation

Femtosecond phenomena

Picosecond phenomena

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