Prototype Development and Validation of a Beam-Divergence Control System for Free-Space Laser Communications. - Alberto Carrasco-Casado; Koichi Shiratama; Dimitar R. Kolev; Phuc V. Trinh; Tetsuharu Fuse; Shingo Fuse; Koji Kawaguchi; Yusuke Hashimoto; Masamitsu Hyodo; Takashi Sakamoto; Terufusa Kunisada; Morio Toyoshima (CoRR, 2022)