Measurement of M²-Curve for Asymmetric Beams by Self-Referencing Interferometer Wavefront Sensor.

Measurement of M²-Curve for Asymmetric Beams by Self-Referencing Interferometer Wavefront Sensor.
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自参考干涉仪波前传感器测量非对称光束的M2曲线

DOI:
10.3390/s16122014
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发表时间:
2016-11-29
期刊:
Sensors (Basel, Switzerland)
影响因子:
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通讯作者:
Du Y
Du Y
中科院分区:
其他
文献类型:
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作者:
Du Y

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对于非对称激光光束,如果选择不同的坐标系或用不同的实验条件测量光束质量,即使在分析相同的光束时,光束质量因子和的值也是不一致的。为了克服这种非唯一性,提出了一种新的光束质量表征方法--M2曲线。M2曲线不仅包含了光束质量因子,而且还引入了一条随坐标轴旋转角α的曲线。此外,我们还提出了一种利用改进的基于自参考马赫-曾德尔干涉仪的波前传感器(以下简称SRI-WFS)实时测量光束传输因子M2曲线的方法。通过对多模光束的理论分析和实验验证了该方法的可行性。实验结果表明,该测量方法简单、快速、无需移动部件,是一种单次测量方法。
For asymmetric laser beams, the values of beam quality factor and are inconsistent if one selects a different coordinate system or measures beam quality with different experimental conditionals, even when analyzing the same beam. To overcome this non-uniqueness, a new beam quality characterization method named as M2-curve is developed. The M2-curve not only contains the beam quality factor and in the x-direction and y-direction, respectively; but also introduces a curve of versus rotation angle α of coordinate axis. Moreover, we also present a real-time measurement method to demonstrate beam propagation factor M2-curve with a modified self-referencing Mach-Zehnder interferometer based-wavefront sensor (henceforth SRI-WFS). The feasibility of the proposed method is demonstrated with the theoretical analysis and experiment in multimode beams. The experimental results showed that the proposed measurement method is simple, fast, and a single-shot measurement procedure without movable parts.
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