12 January 2018 Research on the strong optical feedback effects based on spectral analysis method
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The strong optical feedback has the advantage of generating high resolution fringes. However, these feedback fringes usually seem like the noise signal when the feedback level is high. This defect severely limits its practical application. In this paper, the generation mechanism of noise fringes with strong optical feedback is studied by using spectral analysis method. The spectral analysis results show that, in most cases, the noise-like fringes are observed owing to the strong multiple high-order feedback. However, at certain feedback cavity condition, there may be only one high-order feedback beam goes back to the laser cavity, the noise-like fringes can change to the cosine-like fringes. And the resolution of this fringe is dozens times than that of the weak optical feedback. This research provides a method to obtain high resolution cosine-like fringes rather than noise signal in the strong optical feedback, which makes it possible to be used in nanoscale displacement measurements.
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Zhaoli Zeng, Zhaoli Zeng, XueMin Qu, XueMin Qu, Weina Li, Weina Li, Min Zhang, Min Zhang, Hao Wang, Hao Wang, Tuo Li, Tuo Li, } "Research on the strong optical feedback effects based on spectral analysis method", Proc. SPIE 10621, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 106210P (12 January 2018); doi: 10.1117/12.2285569; https://doi.org/10.1117/12.2285569

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