光泵重水气体分子产生THz激光辐射技术的研究
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摘要
太赫兹波(THz,1THz=1012Hz)是指频率范围从100GHz到10THz,相应的波长范围从30μm到3mm,介于毫米波和红外光之间的电磁波。太赫兹频段是一个非常具有科学价值但尚未开发的电磁辐射区域,近年来,随着对整个电磁波谱研究的深入及完善,以及科学技术的进步,对该领域的研究工作日益重视,太赫兹激光在成像、医学诊断、环境科学、信息通信及基础物理研究领域有着广阔的应用前景和应用价值。国内外的研究状况表明,获得高功率、低造价和小型化的室温运转的THz辐射源是THz研究领域的前沿和重点之一。本文主要研究光泵重水气体分子产生THz激光辐射技术,着重研究了所产生的385μm波长THz激光辐射。
     本论文的主要创新点可以归纳如下:
     1.从D2O气体分子的结构性质出发,运用半经典密度矩阵理论,采用三能级系统模型对光泵重水气体产生THz激光(输出波长为385μm)的原理进行了详尽的理论分析和数值计算,理论分析计算与实验结果具有较好的一致性。
     2.根据对光泵重水气体THz激光器中泵浦源入射光强度和THz信号出射光强度之间关系的研究,提出了表明THz信号出射光强度和泵浦源入射光强度之间的拟合函数,并对其频率调谐特性进行了研究,得到调谐曲线;对光泵重水气体THz激光器的最佳工作参数进行了研究分析;对添加缓冲气体的影响进行了分析;据此可设计相对较高能量转换效率达到最佳工作运行状态的光泵重水气体THz激光器。
     3.实验研制了一种紧凑型工作腔长可变的超辐射光泵重水气体THz激光器系统,激光器系统由泵浦源TEA-CO2激光器、D2O气体分子THz激光工作腔、测量系统以及真空系统组成。实验中使用了范围在80-150cm的可变长度的THz激光工作腔,实验得到了波长为385μm(对应频率约0.78THz),脉冲宽度为100ns,峰值功率百瓦量级(对比估测值)的THz激光脉冲信号输出。
     4.实验研制了带自动控制功能的F-P干涉仪测量系统,设计加工适合THz波段的金属网栅构建干涉装置,使用计算机对整个系统进行控制,可完成THz激光波形测试,THz激光波长测试,THz激光信号强度测试,并与泵浦光强进行比照测试,实时监测,获得了较好的结果。
The terahertz region of the electromagnetic spectrum spans the frequency range between the mid-infrared and the millimeter/microwave. Nowadays, THz technology has widely foreground and great potential of application in imaging, medicine diagnoses, environment science, information communication and basic physical study etc. From internal and overseas study in this region, it is indicated that the way to obtain THz radiation is one of the foreland and emphasis in the THz study area. This thesis focuses on THz radiation generated by Optically-Pumped D2O gas molecules, especially on its 385μm spectrum.
     The main content and key creation points of this dissertation are as follows:
     1. The mechanism and regularities of optically pumped D2O gas THz laser under complex laser process with different operating conditions were studied By solving the density matrix equation of three-level molecular system, the expression of THz signal gain coefficient(Gs)and the pumping signal absorption coefficient (Gp) were deduced and calculated by iteration method. The theoretical result was in good agreement with experiment and could guide to design this kind of THz laser.
     2. The relation function between the intensity of pumping laser and the output THz laser was founded, and the condition of frequency tuning was analyzed; The optimum operation parameters of the THz laser were calculated out; The effect of adding buffer gas was studied; According to these works, a high efficiency and optimal operation laser could be designed.
     3. A compact super-radiant optically pumped D2O gas Terahertz laser was developed, it consisted of pumping source, laser cavity, measurement and vacuum system, and the length of laser cavity could be changed in the range of 80-150cm.The output THz laser signal was 385μm in wavelength,100ns in pulse width and more than a hundred watts in peak power.
     4. A kind of automatic measurement system connected with a metal grid F-P interferometer was developed, it’s controlled by computer and could be used to measure the spectral characteristics and intensity of output THz laser.
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