Litvin Igor A, Dudley Angela, Roux Filippus S, Forbes Andrew
CSIR National Laser Centre, Pretoria, South Africa.
Opt Express. 2012 May 7;20(10):10996-1004. doi: 10.1364/OE.20.010996.
We demonstrate a simple approach, using digital holograms, to perform a complete azimuthal decomposition of an optical field. Importantly, we use a set of basis functions that are not scale dependent so that unlike other methods, no knowledge of the initial field is required for the decomposition. We illustrate the power of the method by decomposing two examples: superpositions of Bessel beams and Hermite-Gaussian beams (off-axis vortex). From the measured decomposition we show reconstruction of the amplitude, phase and orbital angular momentum density of the field with a high degree of accuracy.
我们展示了一种使用数字全息图的简单方法，用于对光场进行完整的方位角分解。重要的是，我们使用了一组与比例无关的基函数，因此与其他方法不同，分解过程不需要初始场的任何信息。我们通过分解两个例子来说明该方法的强大之处：贝塞尔光束和厄米-高斯光束（离轴涡旋）的叠加。从测量的分解结果中，我们展示了能够高精度地重建场的振幅、相位和轨道角动量密度。
