Theoretical investigation and experiment design of intense THz pulsed laser

Chunchao Qi; Dulu Zuo; Fanqi Meng; Zhixian Jiu; Chenguang Yang; Zuhai Cheng

doi:10.1117/12.821843

16 February 2009 Theoretical investigation and experiment design of intense THz pulsed laser

Chunchao Qi, Dulu Zuo, Fanqi Meng, Zhixian Jiu, Chenguang Yang, Zuhai Cheng

Proceedings Volume 7277, Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology; 72770T (2009) https://doi.org/10.1117/12.821843
Event: Photonics and Optoelectronics Meetings, 2008, Wuhan, China

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.

Citation Download Citation

Chunchao Qi, Dulu Zuo, Fanqi Meng, Zhixian Jiu, Chenguang Yang, and Zuhai Cheng "Theoretical investigation and experiment design of intense THz pulsed laser", Proc. SPIE 7277, Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology, 72770T (16 February 2009); https://doi.org/10.1117/12.821843

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KEYWORDS

Terahertz radiation

Pulsed laser operation

Carbon dioxide lasers

Molecules

Optical pumping

Absorption

Picosecond phenomena

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