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Study of Lasing Action in a Pulsed Optically Pumped D2O Gas Terahertz Laser

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Abstract

A modified three-level laser kinetics model for a pulsed high-power optically pumped gas terahertz laser is introduced and used to model the lasing kinetics process of a gas terahertz laser system. We, for the first time to our knowledge, investigated the time evolution dynamics process of the pump intensity, population distribution among the energy levels, pump and THz signal gain coefficient, and the THz laser intensity within the pulsed D2O gas THz laser. High-power THz pulse with peak power of about 7.4 kW and pulse width of 145 ns at wavelength of 385 μm were obtained in the simulation, using an incident pump pulse with peak power of 2.2 MW and pulse width of 110 ns. THz pulse delay of 40 ns and pulse broadening of 35 ns were quantitatively analyzed. In addition, the experimental results for the pulse profile, pulse width, pulse broadening, pulse energy, and peak power are in agreement with the theoretical simulation results.

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Funding

This work was supported by National Natural Science Foundation of China (No. 61571403), Henan Science and Technology Development Plan Project (No. 182102310032, 172102210552), Foundation of Henan Educational Committee (No. 16A140020), and Doctor’s Innovation Fund of Zhengzhou University of Light Industry.

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Authors and Affiliations

  1. School of Physics & Electronic Engineering, Zhengzhou University of Light Industry, Zhengzhou, 450002, Henan, China

    Lijie Geng, Ruiliang Zhang, Zhifeng Zhang, Yusheng Zhai, Yuan Luo & Yuling Su

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  1. Lijie Geng
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  2. Ruiliang Zhang
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  3. Zhifeng Zhang
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  4. Yusheng Zhai
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  5. Yuan Luo
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  6. Yuling Su
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Correspondence to Lijie Geng or Yusheng Zhai.

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Geng, L., Zhang, R., Zhang, Z. et al. Study of Lasing Action in a Pulsed Optically Pumped D2O Gas Terahertz Laser. J Infrared Milli Terahz Waves 39, 1175–1184 (2018). https://doi.org/10.1007/s10762-018-0539-6

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  • DOI: https://doi.org/10.1007/s10762-018-0539-6

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