Liu Yi-Dong, Gao Chunqing, Qi Xiaoqing
Department of Optical-Electronics, School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081, China.
J Opt Soc Am A Opt Image Sci Vis. 2009 May;26(5):1157-60. doi: 10.1364/josaa.26.001157.
We investigate the use of the Porro prism and its application as a beam rotator. The Porro prism can reverse a light beam, and the reversed beam is rotated when the Porro prism rotates. As a result of the two total internal reflections in the Porro prism, the field polarization is changed. We present a schematic setup to realize beam rotation without polarization change and power variation. The setup includes a rotatable Porro prism accompanied by a polarized beam splitter, a quarter-wave plate, and a phase compensator. This beam rotator is useful in the measurement of the orbital angular momentum of a helical beam.
我们研究了波罗棱镜的用途及其作为光束旋转器的应用。波罗棱镜可以使光束反向，并且当波罗棱镜旋转时，反向光束也会随之旋转。由于波罗棱镜中的两次全内反射，场偏振会发生变化。我们提出了一种实现光束旋转而不改变偏振和功率的示意图设置。该设置包括一个可旋转的波罗棱镜以及一个偏振分束器、一个四分之一波片和一个相位补偿器。这种光束旋转器在测量螺旋光束的轨道角动量方面很有用。
