Three-segment fiber transmission dispersion management method for femtosecond lasers in terahertz time-domain spectroscopy systems

Xiaokang Li; Dong Li; Zhipeng Zhao; Yajun Jiang; Dingyi Feng; Wei Li; Deng Pan; Congjing Hao; Defeng Liu; Dexing Yang

doi:10.1117/12.3007567

24 November 2023 Three-segment fiber transmission dispersion management method for femtosecond lasers in terahertz time-domain spectroscopy systems

Xiaokang Li, Dong Li, Zhipeng Zhao, Yajun Jiang, Dingyi Feng, Wei Li, Deng Pan, Congjing Hao, Defeng Liu, Dexing Yang

Author Affiliations +

Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 1293528 (2023) https://doi.org/10.1117/12.3007567
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China

Abstract

In terahertz (THz) time-domain spectroscopy, the excitation of THz waves by fiber optic transmission of femtosecond pulsed lasers can provide great convenience for nondestructive testing of large and medium-sized aircraft. However, due to the high peak power characteristics of the femtosecond laser, the pulse spreading and distortion caused by fiber dispersion and nonlinearity can seriously affect the output laser pulse quality and the excitation of THz waves. In this paper, a three-segment femtosecond laser transmission scheme using asymmetric dual-core fiber (ADCF)-single-mode fiber (SMF)-dispersion-compensated fiber (DCF) is proposed. The simulation study results show that the strong dispersion using a 2.8-cm-long ADCF can reduce the 1 kW peak power to 8.03 W and extend the 50 fs pulse width to 3.74 ps, respectively. The spreading pulse can be restored to the peak power of 987.20 W and pulse width of 51.80 fs after the 10m-long SMF and then transmitted by the 66.9 cm-long DCF. This shows that the proposed femtosecond laser transmission scheme can achieve good pulse recompression and simultaneous recovery of pulse waveform and power, which lays the foundation for the construction of further THz time-domain spectroscopy systems using longer fibers for femtosecond laser transmission.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xiaokang Li, Dong Li, Zhipeng Zhao, Yajun Jiang, Dingyi Feng, Wei Li, Deng Pan, Congjing Hao, Defeng Liu, and Dexing Yang "Three-segment fiber transmission dispersion management method for femtosecond lasers in terahertz time-domain spectroscopy systems", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 1293528 (24 November 2023); https://doi.org/10.1117/12.3007567

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