Abstract

A miniaturized laser beam transmitter, in which a visible laser module at λ=650 nm is precisely stacked upon an infrared (IR) module at λ=905 nm, has been proposed and constructed to provide an IR collimated beam in conjunction with a collinear monitoring visible beam. In particular, the IR beam is selectively dispersed through a perforated sheet diffuser, so as to create a rapidly diverging close-range beam in addition to a highly defined long-range beam simultaneously. The complementary close-range beam plays a role in mitigating the blind region in the vicinity of the transmitter, which is inevitably missed by the main long-range beam, thereby uniformly extending the transmitter's effective trajectory that is sensed by a receiver. The proposed transmitter was designed through numerical simulations and then fabricated by incorporating a diffuser sheet, perforated with an aperture of 2 mm. For the manufactured transmitter, the IR long-range beam was observed to have divergences of ~2.3 and 1.6 mrad in the fast and slow axes, respectively, while the short-range beam yielded a divergence of ~24 mrad. The angular alignment between the long-range IR and visible beams was as accurate as ~0.5 mrad. According to an outdoor feasibility test involving a receiver, the combination of the IR long- and short-range beams was proven to achieve a nearly uniform trajectory over a distance ranging up to ~600 m, with an average detectable cross-section of ~60×80cm².

© 2012 Optical Society of Korea

Compact laser transmitter delivering a long-range infrared beam aligned with a monitoring visible beam

Hong-Shik Lee, Haeng-In Kim, and Sang-Shin Lee
Appl. Opt. 51(17) 3936-3940 (2012)

46.4 Gbps visible light communication system utilizing a compact tricolor laser transmitter

Junhui Hu, Fangchen Hu, Junlian Jia, Guoqiang Li, Jianyang Shi, Junwen Zhang, Ziwei Li, Nan Chi, Shaohua Yu, and Chao Shen
Opt. Express 30(3) 4365-4373 (2022)

Wide field-of-view laser-based white light transmitter for visible light communications

Yuqi Hou, Zhichong Wang, Meixin Liu, Shulan Yi, Xiaoqian Wang, Liang Xia, Guangyi Liu, Jianyang Shi, Ziwei Li, Junwen Zhang, Nan Chi, and Chao Shen
Opt. Lett. 49(10) 2805-2808 (2024)

Compact high-power multiwavelength photonic-crystal-fiber-based laser source of femtosecond pulses in the infrared–visible–ultraviolet range

Huagang Liu, Minglie Hu, Bowen Liu, Youjian Song, Lu Chai, Aleksei M. Zheltikov, and Chingyue Wang
J. Opt. Soc. Am. B 27(11) 2284-2289 (2010)

Infrared to Visible Parametric Upconversion

R. F. Lucy
Appl. Opt. 11(6) 1329-1336 (1972)