First-of-its kind phase-coherent fiber laser array system

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The U.S. Army Research Laboratory’s Computational and Information Science Directorate’s Intelligent Optics Team, and partners, recently developed, engineered, demonstrated and delivered the world’s first known working Adaptive Phase Coherent Fiber Laser Array system, which will better enable Soldiers’ directed energy weapons and laser communication systems on the battlefield. The key members of the Intelligent Optics Team include Dr. Jiang Liu, electronics engineer, Dr. Leonid Beresnev, physicist, and Gary Carhart, electronics technician, all from CISD’s Atmospheric Sensing Branch. The development of the system spurred from a collaborative agreement between ARL, the Defense Advanced Research Projects Agency, Massachusetts Institute of Technology Lincoln Labs, Optonicus and various academic partners. ARL’s efforts were central to the recent successful DARPA real-world development of a 21-element optical phased array system, of which ARL developed and provided the low-power and high-power fiber subapertures and other key components including control electronics and operation software. The demonstration was part of DARPA’s Excalibur program, the overall goal of which is to develop coherent optical phased array technologies as an enabler for scalable laser weapons. The fiber laser array system, developed after more than a decade of research and testing, consists of phase locking and beam combining for multichannel, 7 and

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