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Superresolution Technology for Reduction of the Far-field Diffraction Spot Size in the Laser Free-space Communication System by Jia Jia; Changhe Zhou; Liren Liu is a Engineering article available to read on EtoBox.

What is Superresolution Technology for Reduction of the Far-field Diffraction Spot Size in the Laser Free-space Communication System about?

In the free-space laser communication there is sometimes a strong need for reduction of the diffraction spot size in the far field. In this paper, instead of the usage of the larger size aperture lens in the free-space laser communication system, we introduce diffractive superresolution technology to design and fabricate a cheap pure-phase plate for realizing the smaller spot size than the usual Airy spot size, which can decrease the weight and size of the emitting lens. We have calculated 2, 3, 4, 5 circulation zones for optimizing the highest energy compression (Strehl ratio) with the constraint of the First zero ratio value G 1⁄4 0.8. Numerical results show that the 2-or 3-circular zone pure-phase plate can yield the highest Strehl ratio ðS % 0:59Þ with the constraint of G 1⁄4 0.8, but the 4, 5 circular zone binary phase (0,pÞ plates are calculated to yield the result of S % 0:57 with G 1⁄4 0.8. We have fabricated 2-and 3-circular zone binary phase plate with binary optics technology. Finally, we have established an experimental system for simulation of the freespace laser communication to verify the advantage of the superresolution phase plate. Detailed experiments are presente

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Author

Jia Jia; Changhe Zhou; Liren Liu

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0030-4018)

Published

2003

Language

EN

Field

Engineering (Physical Sciences)