Self-mixing interference in a diode laser: experimental observations and theoretical analysis.
Self-mixing interference in a diode laser: experimental observations and theoretical analysis.
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DOI：
10.1364/ao.32.001551
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发表时间：
1993-03
期刊：
影响因子：
1.9
通讯作者：
W. M. Wang;W. Boyle;K. Grattan;A. W. Palmer
中科院分区：
文献类型：
--
作者：
W. M. Wang;W. Boyle;K. Grattan;A. W. Palmer
本文介绍了半导体激光器自混合效应或后向散射调制的实验研究结果，并作了简单的理论分析。激光器用于在自由空间或通过光纤将光发送到可移动目标，从该可移动目标检测光学反向散射并将其反馈到激光器中。在实验中得出三个重要结论：（1）自混合干涉不依赖于激光的相干长度，（2）干涉不依赖于使用单模或多模激光作为光源，以及（3）干涉与所采用的光纤类型无关，即，无论是单模还是多模。与传统干涉仪的比较表明，自混合干涉具有与传统干涉仪相同的相位灵敏度，其调制深度与传统干涉仪相当，并且可以从干涉信号中获得相位移动的方向。上述因素对广泛的物理参数的光学感测具有影响。该方法的几个应用进行了讨论，突出的显着优势的简单性，紧凑性和鲁棒性，以及基于光纤的自混合干涉测量的自对准和自检测能力相比，使用传统的干涉方法。
The experimental results of an investigation of self-mixing effects or backscatter modulation in diode lasers coupled with a simple theoretical analysis are presented. The laser is used to send light, either in free space or through an optical fiber, to a movable target from which the optical backscatter is detected and fed back into the laser. In the experiment three significant conclusions are drawn: (1) self-mixing interference is not dependent on the coherence length of the laser, (2) the interference is not dependent on the use of a single-mode or multimode laser as the source, and (3) the interference is independent of the type of fiber employed, i.e., whether it is single mode or multimode. A comparison of this kind of interference with that in a conventional interferometer shows that self-mixing interference has the same phase sensitivity as that of the conventional arrangement, the modulation depth of the interference is comparable with that of a conventional interferometer, and the direction of the phase movement can be obtained from the interference signal. The above factors have implications for the optical sensing of a wide range of physical parameters. Several applications of the method are discussed that highlight the significant advantages of simplicity, compactness, and robustness as well as the self-aligning and self-detecting abilities of fiber-based self-mixing interferometry when compared with the use of conventional interference methods.