图11 多纵模拍频得到的微波频谱图

　　图12 经非线性调制技术得到的微波频谱图

　　3 结束语毫米波是在军事、通信和微波传感方面上均有广泛应用的电磁波，最近兴起的60GHz 波段的宽带无线接入技术引起非常大的关注，产生高频微波技术的重要性日益显现，然而，利用传统的方式产生高频微波不仅价格昂贵，而且实现方式十分复杂。相比之下，光学方式产生微波却具有成本低廉，结构简单，且更易于得到稳定、相位噪声小的高频微波。可见，光学方式产生微波逐渐成为全世界的研究主题。在本文中，我们回顾了近几年来利用光学方式产生微波的几种方式，并对其物理机制和优缺点分别进行了比较分析，所有的方法最终都是为实现三个要点，具体如下：1)拍频：两个光波的模式必须很接近，以致能形成拍频;2)相位稳定：两个模式之间相位差要恒定，否则产生的微波机有很大的高频相位噪声;3)两个模式的间隔必须恒定：间隔很小的变化将引起产生的微波频率很大的抖动。显然，光学方式产生高频微波技术要想得到更广泛的应用还需要进一步的研究。相信随着科技的进一步发展，新的技术的不断涌现，具有更优异性能的产生高频微波的光学方式必将实现，并将被广泛应用到军事、医疗方面以满足人们日益增长的需求。

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