连续激光泵浦重水气体分子产生THz激光辐射的阈值分析

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

连续激光泵浦重水气体分子产生THz激光辐射的阈值分析

何志红陈长水刘颂豪张会云张玉萍罗锡璋

1 电子科技大学中山学院电子信息学院，广东中山 528402； 2 华南师范大学光子纳米生物技术研究中心，广东广州 510631； 3 山东科技大学理学院，山东青岛 266510； 4 中山大学光电材料与技术国家重点实验室，广东广州 510275

收稿日期:2012-10-29 修回日期:2013-05-27 出版日期:2013-07-28 发布日期:2013-07-06
通讯作者: 何志红（1968-），博士，主要研究方向为太赫兹激光技术和半导体照明技术。 E-mail:honghezhi@163.com
基金资助:
广东省自然科学基金（9452840301003552），国家自然科学基金（61001018），广东省科技计划（00760211330304099），

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

摘要/Abstract

摘要： 利用连续运转二氧化碳激光器的9R(22) 输出谱线泵浦重水气体(D2O)分子可以产生波长为385微米，频率为0.78THz的连续激光辐射输出，采用半经典理论分析方法并结合三能级系统模型可以对此激光过程进行有效的分析，通过合理的近似简化了求解过程，得到了光场中太赫兹激光信号增益系数Gs和泵浦光信号吸收系数Gp的解析表达式，通过对求解结果的分析，计算出产生THz激光振荡的泵浦阈值条件为6.24×10-3W/mm2，一般情况下，在泵浦激光输出光斑面积为0.25mm2时，要求泵浦激光谱线的输出功率达到1.6mW以上才能形成THz激光辐射。

关键词: 激光物理, 泵浦阈值, 半经典理论, 重水气体分子, 太赫兹技术

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

中图分类号:

TN241

何志红陈长水刘颂豪张会云张玉萍罗锡璋. 连续激光泵浦重水气体分子产生THz激光辐射的阈值分析[J]. J4, 2013, 30(4): 411-417.

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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