失调光束的倾斜角识别及轨道angular momentum光谱色散校正
Identifying the tilt angle and correcting the orbital angular momentum spectrum dispersion of misaligned light beam
摘要：
光学系统中光束的光轴倾斜会引起轨道角动量谱的色散。为了解决这个问题，提出了一个两步的方法，并证明了。首先，利用电荷耦合器件（CCD）摄像机，推导出不同参考轴下的OAM拓扑电荷变化量与光轴倾斜角的关系，确定光轴倾斜角。在实验中，倾角测量精度约为10- 4 rad，OAM阶数为-3 3。使用测量的角度值，可以计算由于轴倾斜引起的附加相位延迟，使得可以在光轴未对准的情况下用简单的公式校正OAM光谱的色散。实验结果表明，该方法不仅成功地提取了纯OAM态的原始OAM谱，而且成功地提取了叠加态的原始OAM谱。
英文摘要：
The axis tilt of light beam in optical system would introduce the dispersion of orbital angular momentum (OAM) spectrum. To deal with it, a two-step method is proposed and demonstrated. First, the tilt angle of optical axis is identified with a deduced relation between the tilt angle and the variation of OAM topological charges with different reference axes, which is obtained with the help of a charge coupled device (CCD) camera. In our experiments, the precision of measured tilt angle is about 10-4rad with OAM orders of -3~3. Using the measured angle value, the additional phase delay due to axis tilt can be calculated so that the dispersion of OAM spectrum can be corrected with a simple formula while the optical axis is not aligned. The experimental results indicate that the original OAM spectrum has been successfully extracted for not only the pure OAM state but also the superposed OAM states.
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