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中文摘要：
提出一种直接测量光束的轨道角动量的方法，其原理是把具有轨道角动量的光束照射到一个金属靶上，使其在光束的角动量作用下发生转动．通过测量靶转动的角度来计算光束的角动量值．对几种不同参数的光束的轨道角动量进行了测量，获得了轨道角动量与光束参数之间的关系，实验结果与理论分析较好地符合．
英文摘要：
Complex astigmatic elliptical beams possess very high orbital angular momentum. This kind of beams has important applications in many fields, such as atomic physics and biology. An experimental method of optical torsion balance to measure the orbital angular momentum of the beams is presented in this paper. In our experiment, the absorption slice rotates under the irradiation of the beam. The angular momentum of beams is obtained by measuring the rotation angle of the absorption slice. The angular momentum of complex astigmatic elliptical beam with different parameters is measured in this paper. The dependences of orbital angular momentum on the parameters of the elliptical beams are investigated. The experimental results are consistent with the theoretical predictions.
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