Suppression of the zero-order diffracted beam from a pixelated spatial light modulator by phase compression |
| |
Authors: | Liang Jinyang Wu Sih-Ying Fatemi Fredrik K Becker Michael F |
| |
Affiliation: | Electrical and Computer Engineering Department, University of Texas at Austin, Austin, Texas 78712, USA. jinyang.liang@mail.utexas.edu |
| |
Abstract: | Phase compression is used to suppress the on-axis zero-order diffracted (ZOD) beam from a pixelated phase-only spatial light modulator (SLM) by a simple modification to the computer generated hologram (CGH) loaded onto the SLM. After CGH design, the phase of each SLM element is identically compressed by multiplying by a constant scale factor and rotated on the complex unit-circle to produce a cancellation beam that destructively interferes with the ZOD beam. Experiments achieved a factor of 3 reduction of the ZOD beam using two different liquid-crystal SLMs. Numerical simulation analyzed the reconstructed image quality and diffraction efficiency versus degree of phase compression and showed that phase compression resulted in little image degradation or power loss. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|