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Figure 1 from A free-space underwater laser communication device with high pulse energy and small volume | Semantic Scholar
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Electro-optical undersea laser camera able to take clear images in murky waters may be introduced soon | Military Aerospace
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Amiet R. Kashyap on Twitter: "Btw DRDO's SSPL has also developed a Blue Laser Diode based submarine communication sys. It uses Blue GaN laser diode directly modulated by pre-leveled 16-QAM(quad) orthogonal frequency
Compact scintillating-fiber/450-nm-laser transceiver for full-duplex underwater wireless optical communication system under turbulence
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