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Being able to dynamically control the transmitted-beam divergence can bringimportant advantages in free-space optical communications. Specifically, thistechnique can help to optimize the overall communications performance when theoptimum laser-beam divergence is not fixed or known. This is the case in mostrealistic space laser communication systems, since the optimum beam divergencedepends on multiple factors that can vary with time, such as the link distance,or cannot be accurately known, such as the actual pointing accuracy. A dynamicbeam-divergence control allows to optimize the link performance for everyplatform, scenario, and condition. NICT is currently working towards thedevelopment of a series of versatile lasercom terminals that can fit a varietyof conditions, for which the adaptive element of the transmitted beamdivergence is a key element. This manuscript presents a prototype of abeam-divergence control system designed and developed by NICT and Tamron toevaluate this technique and to be later integrated within the lasercomterminals. The basic design of the prototype is introduced as well as the firstvalidation tests that demonstrate its performance.

Prototype Development and Validation of a Beam-Divergence Control System for Free-Space Laser Communications