Kilowatt-class high power fiber-coupled diode lasers at 450nm

Könning, Tobias; Harth, Florian; König, P.; Wolf, P.; Stoiber, Michael; Kissel, H.; Köhler, Bernd

doi:10.1117/12.2545887

Cited by 1 publication

(1 citation statement)

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“…If the divergence cannot be further tuned, increasing the aperture size of the retroreflector and fiber sensing ring will also increase the sensing SNR. Second, as shown in Figure 18(b), the optical power of the laser diode can be increased from 10s of milliwatts into the kilowatts range [56], increasing the range from 10s to 100s of meters. Notably, if the optical power of the laser diode increases, optics with sufficient damage thresholds must also be chosen.…”

Section: Discussionmentioning

confidence: 99%

Sunflower

Carver

Shao

Lensgraf

et al. 2022

Proceedings of the 20th Annual International Conference on Mobile Systems, Applications and Services

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Locating underwater robots is fundamental for enabling important underwater applications. The current mainstream method requires a physical infrastructure with relays on the water surface, which is largely ad-hoc, introduces a significant logistical overhead, and entails limited scalability. Our work, Sunflower, presents the first demonstration of wireless, 3D localization across the air-water interface -eliminating the need for additional infrastructure on the water surface. Specifically, we propose a laser-based sensing system to enable aerial drones to directly locate underwater robots. The Sunflower system consists of a queen and a worker component on a drone and each tracked underwater robot, respectively. To achieve robust sensing, key system elements include (1) a pinholebased sensing mechanism to address the sensing skew at air-water boundary and determine the incident angle on the worker, (2) a novel optical-fiber sensing ring to sense weak retroreflected light, (3) a laser-optimized backscatter communication design that exploits laser polarization to maximize retroreflected energy, and (4) the necessary models and algorithms for underwater sensing. Realworld experiments demonstrate that our Sunflower system achieves average localization error of 9.7 cm with ranges up to 3.8 m and is robust against ambient light interference and wave conditions. CCS CONCEPTS• Hardware → Sensor devices and platforms; Sensor applications and deployments.

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Section: Discussionmentioning

confidence: 99%