【作者】 范月霞；

【导师】 何云贵；

【作者基本信息】 华中科技大学 ， 物理电子学， 2006， 硕士

【摘要】 在中小功率激光器加工领域,CO₂激光器由于其卓越的性能而得到了广泛的应用,利用声光作用可以快速而有效地控制激光束地频率、方向和强度,从而更大程度地满足了激光加工领域地特殊需要。但是目前CO₂激光器较常见的是采用电调制实现脉冲输出,其脉冲宽度只能达到几百微秒的数量级,难以满足某些生产领域中的需要,而通过声光调制可获得较窄的脉冲。其次,目前CO₂激光器一般采用连续直流放电的方式,其控制速度较慢,如果采用声光调Q,我们不仅可以提高的响应速度,同时还可获得强脉冲。因此,本文就CO₂激光器的声光调制技术展开了论述。论文首先对激光调制的概念和分类、声光调制的应用现状和声光技术在激光领域的应用进行了介绍。紧接着从声光调制的原理入手,详细的介绍了拉曼-纳斯衍射和布拉格衍射这两种基本的声光作用并给出其理论模型。在此基础上,论文进一步介绍了声光调制器的结构及重要参数。纵观目前国内对声光调制的一些应用研究,基本都是采用高频信号发生器来驱动声光调制器,见于文献报道的声光驱动电源的设计研究较少,因此,本文对声光调制器的驱动电源进行了设计。鉴于实验室已有的硬件条件,本文采用的是IntraAction公司的AGM-406B1M型红外声光调制器,根据其参数要求,我们给出了符合要求的驱动电源的设计方法及试验结果。通过前述的理论分析和电源的设计,最后我们对AGM-406B1M型红外声光调制器的幅度调制、频率偏移和声光偏移进行了研究,并给出了matlab仿真结果。更多还原

【Abstract】 The CO₂ laser is widely applied for its excellent capability in the area of the low power laser process. And optic electricity technology meets the need of laser process for which can focus the laser beam on a diffraction limit spot, control the frequency, direction and intensity of laser beam very fast and efficiently. Nowadays, electro-optic modulation technology was used on the CO₂ laser generally to get the pulse of which the width is just hundreds of seconds, that is hardly to meet the need of special laser process area. And secondly the CO₂ laser can’t get high response speed that usually employs continuous DC charged excited technology. If the acoustic-optic modulation technology is employed, we can get short and high intensity pulse, and achieve high response speed. So AOM technology of CO₂ laser is discussed in this thesis.At first, the concept and class of laser modulation and application of acoustic-photo modulation is presented. And then based on the theory of the interaction of acoustic wave and optic wave, the Raman-Nath and Bragg diffraction are introduced in detail, of which theoretical model is given. Later, the structure and key parameter of acoustic-photo modulator are presented.Now, the research of acoustic-photo modulation technology almost uses the high frequency generator as the driver of acoustic-photo modulator, and the study and design of driver is seldom reported in literature. Based on the condition of my library, the design method and related result of experiment of the model AGM-406B1M infrared acoustic-optic modulator RF power are given based on the parameter in this thesis.After the theory presenting and design of the driver, the research and simulation of amplitude modulation, frequency shifting, and deflection of AGM-406B1M infrared acoustic-optic modulator is presented at last.更多还原