Analysis of pump threshold for producing terahertz laser radiation in continuous laser pumping heavy water gas molecules

J4 ›› 2013, Vol. 30 ›› Issue (4): 411-417.

• Laser Tech. and Devices • Previous Articles Next Articles

Analysis of pump threshold for producing terahertz laser radiation in continuous laser pumping heavy water gas molecules

He Zhihong，Chen Changshui，Liu Songhao，Zhang Huiyun，Zhang Yuping，Luo Xizhang

1 College of Electronic Information, Zhongshan Institute，University of Electronic Science and Technology of China, Zhongshan 528402,China； 2 Photon & Nano Research Centre for Biosciences, South China Normal University, Guangzhou 510631, China； 3 College of Science, Shandong University of Science and Technology, Qingdao 266510, China； 4 State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, China

Received:2012-10-29 Revised:2013-05-27 Published:2013-07-28 Online:2013-07-06

Abstract

Abstract: Using continuous operation carbon dioxide laser 9R(22) output line pumping heavy water gas (D2O) molecules can produce continuous Terahertz laser radiation output with 385 microns wavelength and 0.78 Terahertz frequency. The laser process can be effectively analyzed with the semi-classical theory analysis method combining three level system model, and the solving process was simplified through reasonable approximation. The analytical expressions of Terahertz laser signal gain coefficient Gs and pump light signal absorption coefficient Gp were obtained, and the pump threshold for producing Terahertz laser oscillation was calculated to be 6.24 x 10-3 w/mm2. Normally, when the pump laser output spot area is 0.25mm2, the output power of its 9R(22) spectral line need to be above 1.6 mW for stimulating Terahertz laser radiation.

Key words: laser physics, pump threshold, semi-classical theory, D2O gas molecule, terahertz technology

CLC Number:

TN241

He Zhihong，Chen Changshui，Liu Songhao，Zhang Huiyun，Zhang Yuping，Luo Xizhang. Analysis of pump threshold for producing terahertz laser radiation in continuous laser pumping heavy water gas molecules[J]. J4, 2013, 30(4): 411-417.

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Analysis of pump threshold for producing terahertz laser radiation in continuous laser pumping heavy water gas molecules

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