Direct observation of Gouy phase shift in a propagating optical vortex

Author(s): Junichi Hamazaki, Yuriya Mineta, Kazuhiro Oka, and Ryuji Morita

Abstract:

“Direct observation of Gouy phase shift on an optical vortex was presented through investigating the intensity profiles of a modified LGpm beam with an asymmetric defect, around at the focal point. It was quantitatively found that the rotation profile of a modified LGpm beam manifests the Gouy phase effect where the rotation direction depends on only the sign of topological charge m. This profile measurement method by introducing an asymmetric defect is a simple and useful technique for obtaining the information of the Gouy phase shift, without need of a conventional interference method. In addition, the 3-dimernsional trajectory of the defect was found to describe a uniform straight line.”

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Publication: Optics Express
Issue/Year: Optics Express, Vol. 14, Issue 18, pp. 8382-8392, 2006
DOI: 10.1364/OE.14.008382

An adaptive optics imaging system based on a high-resolution liquid crystal on silicon device

Author(s): Quanquan Mu, Zhaoliang Cao, Lifa Hu, Dayu Li, and Li Xuan

Abstract:

“An adaptive optics imaging system is introduced in this paper. A high resolution liquid crystal on silicon (LCOS) device was used as a phase only wave front corrector instead of a conversional deformable mirror. The wave front aberration was detected by a Shack-Hartmann (SH) wave front sensor, which has λ/100 rms wave front measurement accuracy. Under this construction 0.09λ (λ=0.6328µm) Peak to Valley correction precision was reached. Further more, some low frequency hot convection turbulence induced by an electric iron was compensated in real time at the same precision. The Modulation Transfer Function (MTF) of this system was also measured before and after wave front correction. Under the active correction of LCOS, the system reached the diffraction limited resolution approximately 65l p/mm on the horizontal direction. All of this showed the ability of using this device in high resolution, low temporal turbulence imaging system, such as retinal imaging, to improve the resolution performance.”

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Publication: Optics Express
Issue/Year: Optics Express, Vol. 14, Issue 18, pp. 8013-8018, 2006
DOI: 10.1364/OE.14.008013