Realization of large energy proportion in the central lobe by coherent beam combination based on conformal projection system

Scientific Reports
Dong ZhiLei Si

Abstract

In this paper, we experimentally validate a tiled-aperture conformal projection system with the largest array filling factor and element beam truncation factor to the best of our knowledge. The conformal projection system, which is made up of a hexagonal adaptive fiber-optics collimator (AFOC) array with the proximate ideal intensity distributions, is fabricated and the performance of output beam is tested and evaluated properly and carefully. Both of the active phase-locking control and precise tip-tilt control are implemented successfully in the CBC of the hexagonal seven-beam-array. Experimental results show a large energy proportion (47%, which increases by over 10% comparing with the previously demonstrated largest value) in the central lobe is achieved and the residual phase error is lower than λ/27. When the AFOC array performs, the precise tilt control makes the combining beams overlap well and the average normalized metric value is improved from 0.336 without control to 0.947 with both of active piston and tip-tilt phase controls while the fringe contrast increases from 19% to more than 91% correspondingly. This work presents a promising structure for the achievement of large energy proportion in the central lobe in hi...Continue Reading

References

Feb 19, 2008·Optics Letters·Eric C CheungMichael Wickham
Aug 5, 2008·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Mikhail A Vorontsov, Svetlana L Lachinova
May 19, 2010·Optics Letters·Gregory D GoodnoMark E Weber
Sep 22, 2011·Optics Express·Jérome BourderionnetArnaud Brignon
Jul 10, 2012·Optics Express·Gregory D Goodno, S Benjamin Weiss
Jul 25, 2012·Optics Letters·Shawn M RedmondGregory D Goodno
Feb 13, 2016·Optics Letters·Thomas WeyrauchAndrey Rostov
Jul 15, 2016·Optics Express·Lyle E RobertsDaniel A Shaddock

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