Design of optical hybrids based on a subwavelength polarization grating

WAN Ling-yu; BAN Wei-hua; LU Zhi-yong

doi:10.3969/j.issn.1001-3806.2011.03.018

For the coherent detection of laser beams in free space, a new 24 90 optical hybrid for freely propagating laser beams was proposed based on the diffraction and polarization characteristics of a subwavelength polarization grating. It mainly consists of a subwavelength polarization grating, two half-wave-plates and two polarization splitters. The split and recombination of the signal beam and the local oscillator beam are achieved through the subwavelength polarization grating. The desired phase relation is obtained when orthogonally polarized beam components of the left-circularly and right-circularly polarized light are spatially separated under given conditions so that the rigid phase requirement for the beam splitters in traditional space optical hybrids is avoided and stable phase output can be obtained easily. It has potential applications in field of free-space laser coherent communication.

Design of optical hybrids based on a subwavelength polarization grating

1. College of Physics Science and Technology, Guangxi University, Nanning 530004, China

Received Date: 2010-07-14

Accepted Date: 2010-08-29

Available Online: 2011-05-25

Abstract: For the coherent detection of laser beams in free space, a new 24 90 optical hybrid for freely propagating laser beams was proposed based on the diffraction and polarization characteristics of a subwavelength polarization grating. It mainly consists of a subwavelength polarization grating, two half-wave-plates and two polarization splitters. The split and recombination of the signal beam and the local oscillator beam are achieved through the subwavelength polarization grating. The desired phase relation is obtained when orthogonally polarized beam components of the left-circularly and right-circularly polarized light are spatially separated under given conditions so that the rigid phase requirement for the beam splitters in traditional space optical hybrids is avoided and stable phase output can be obtained easily. It has potential applications in field of free-space laser coherent communication.

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Reference (15)

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Design of optical hybrids based on a subwavelength polarization grating

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