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Proceedings Paper

Theoretical investigation and experiment design of intense THz pulsed laser
Author(s): Chunchao Qi; Dulu Zuo; Fanqi Meng; Zhixian Jiu; Chenguang Yang; Zuhai Cheng
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Paper Abstract

In this article we report on studies aimed at a theoretical description and an experiment design of generation of intense THz pulsed laser. Through solving the time-independent rate equations, the absorption coefficient and the gain coefficient of intense THz pulsed laser are obtained with the assumption of the pump rate and the induced transition rate much larger than collision rate. The analysis further shows that at low pressure the absorption coefficient is proportional to the second power of pressure and is in inverse proportion to pump intensity, and that the gain coefficient has the same feature expect for being in inverse proportion to THz radiation intensity. Meanwhile the expressions of the saturation pumping intensity and THz radiation intensity are given under the same assumption. On the other hand the expression of energy absorbed from pump beam is derived from solving the time-dependent rate equations, and we demonstrate that path length, gas pressure, and pulse width are the important factors impacting on the energy absorbed from pump beam. When transmission of pump laser is determined, it is found that gain molecule mass, gas pressure and pulse width exist an inner confine relation. Finally according to the theoretical analysis and some parameters assumed, we present an experiment design of the intense THz pulsed laser.

Paper Details

Date Published: 16 February 2009
PDF: 10 pages
Proc. SPIE 7277, Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology, 72770T (16 February 2009); doi: 10.1117/12.821843
Show Author Affiliations
Chunchao Qi, Wuhan National Lab. for Optoelectronics (China)
Huazhong Univ. of Science and Technology (China)
Dulu Zuo, Wuhan National Lab. for Optoelectronics (China)
Huazhong Univ. of Science and Technology (China)
Fanqi Meng, Wuhan National Lab. for Optoelectronics (China)
Huazhong Univ. of Science and Technology (China)
Zhixian Jiu, Wuhan National Lab. for Optoelectronics (China)
Huazhong Univ. of Science and Technology (China)
Chenguang Yang, Wuhan National Lab. for Optoelectronics (China)
Huazhong Univ. of Science and Technology (China)
Zuhai Cheng, Wuhan National Lab. for Optoelectronics (China)
Huazhong Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 7277:
Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology
Jianquan Yao; Shenggang Liu; Xi-Cheng Zhang, Editor(s)

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