Harbin Engineering University's Laser-propelled Ultra-high-speed SilentWith Speeds Comparable To Jet Engines

Recently, Chinese scientists at Harbin Engineering University (HEDU) announced the successful development of a laser propulsion system that promises to usher in a new era oftechnology.
The disruptive technology does away with traditional propulsion shafts and propellers and instead uses advanced laser pulses and thin optical fibers to generate amazing thrust comparable to commercial jet engines.
Scientists say the technology is expected to play a wide range of applications in areas such as stealthpropulsion.
Amazingly, the entire system operates with just 2 megawatts of laser power, which is well within the power limitations of asubmarine. 2 megawatts - alone - can generate up to 70,000 newtons of thrust, slightly less than a commercial jet engine. Previously considered a distant dream, this leap in efficiency has now become a reality.
Quantum leap inpropulsion
Formally known as "underwater fiber laser-induced plasma blast wave propulsion," the idea is ingenious: A laser generates plasma underwater, which then creates a so-called "detonation wave" to propel theforward. forward.
The potential is so great that thewill be able to travel deeper than its current speed limit. Even more amazingly, this laser-basedis completely free of mechanical vibration, which has historically been a fatal hazard for submarines to hide their tracks.
Although the concept of underwater laser propulsion is not new, as early as 20 years ago by Japanese scientists, but due to the inefficiency of propulsion guidance, has not been able to achieve a breakthrough. However, a research team led by the School of Electromechanical Engineering at Harbin Engineering University has overcome this challenge by introducing a unique mechanism that successfully focuses and guides the laser-generated plasma in a controlled manner.
The core principle of this innovation lies in the use of high-energy lasers emitted from optical fibers thinner than a hair, through the evaporation of seawater to produce bubbles known as "supercavitation" (supercavitation), which greatly reduces the resistance of the water. At the same time, the laser creates plasma in the water and triggers a blast wave, and the team's innovation is that they are able to use this challenging blast wave, which spreads out in all directions, to provide thewith a specific direction of drive.
The solution involves discharging tiny spherical metal particles and applying the blast force to them. When the metal particles leave one end of the submarine, along with the laser pulse, the underwater vehicle is pushed in the opposite direction.
Another highlight of this technology is that it can also be applied to underwatersystems to significantly increase the underwater range of projectiles, underwater missiles or torpedoes by generating the phenomenon of supercavitation.
The surface of ausing this technology would be covered with ultra-thin, ultra-fine optical fibers, each thinner than a human hair, which could emit lasers, the engineers said in a recent paper published in the Chinese journal Acta Optica Sinica.
Challenges and future applications
However, despite this remarkable progress, there are still a number of challenges that lie ahead before the technology can be fully applied onsubmarines. These include how to effectively manage the heat generated by the lasers, ensuring the durability of the optical fiber in extreme deep-sea environments, and how to seamlessly integrate this system with existingstructures such as anechoic tiles.
In addition, for stealth submarines, while the laser technology is able to eliminate noise generated by mechanical vibrations, the cavitation bubbles themselves may generate non-negligible acoustic noise. This could make thean obvious target for sonar, raising questions about the viability of this technology forapplications.
However, even with these challenges, the technology's civilian prospects remain promising. It is expected to revolutionize the way ships are powered, contributing to greener, more efficient sea travel. With the continuous efforts of researchers and the continuous improvement of the technology, we have reason to believe that the laser propulsion system will bring about a radical change intechnology in the near future.