Oesch Denis W, Sanchez Darryl J
Science Applications International Corporation, Albuquerque, New Mexico, USA.
Opt Express. 2012 May 21;20(11):12292-302. doi: 10.1364/OE.20.012292.
Previous work by Allen, demonstrated that optical beams possess orbital angular momentum. Other work has shown that a random, phase-only disturbance can impart ± 1 orbital angular momentum states to propagating waves. However, the field preceding the formation of these ± 1 states was unknown. In this paper, we identify the unique field that leads to the formation of a pair of branch points, indicators of orbital angular momentum. This field is then verified in a bench-top optical experiment.
艾伦之前的研究表明，光束具有轨道角动量。其他研究表明，仅相位的随机扰动可以将±1轨道角动量状态赋予传播的波。然而，在这些±1状态形成之前的场是未知的。在本文中，我们确定了导致一对分支点形成的独特场，分支点是轨道角动量的指标。然后在台式光学实验中对这个场进行了验证。
