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Military laser application in the military
Semiconductor lasers are widely used in military applications due to their compact size, long operational life, ease of modulation, and cost-effectiveness. These features make them ideal for various defense technologies such as laser guidance systems, laser radar (LIDAR), laser fuzes, laser rangefinders, laser communication, and laser gyroscopes. Their versatility has led to significant investment from developed countries in the advancement of high-power semiconductor lasers for military use.
A semiconductor laser fuze is a type of active proximity fuze that detects targets using laser technology. It processes the reflected laser signals to identify the target, calculate the optimal detonation point, and trigger the explosion at the right moment. In case of failure or loss of the target, an internal safety mechanism ensures the projectile is still detonated. This application represents one of the most successful implementations of laser detection in weapon systems.
Laser guidance allows missiles to follow a laser beam until they reach and destroy their target. This method is commonly used in ground-to-air and ground-to-ground missile systems. One common technique is beam riding, where a coded laser beam is directed toward the target, and the missile adjusts its course based on the signal received from the rear. Another method involves fiber-optic guidance, where sensor data is transmitted through an optical fiber, allowing real-time control and monitoring of the missile.
Laser ranging is widely applied in anti-tank weapons, aviation, and aerospace. Semiconductor lasers provide a concealed light source with improved accuracy, enabling distance measurement and digital display. They also serve as night vision tools, with high-power arrays capable of detecting targets up to 1 km away. When combined with scanning and image processing, these systems can function as advanced night vision monitors.
LIDAR systems using semiconductor lasers offer advantages over traditional CO2 lasers, including smaller size, higher precision, and real-time imaging capabilities. They are used for target tracking, atmospheric monitoring, and collision avoidance in aircraft and missiles. Most semiconductor LIDAR systems operate in the 820–850 nm wavelength range.
Laser simulation is a modern training technique that uses semiconductor lasers to mimic weapon systems. By adjusting parameters like beam intensity, frequency, and range, it simulates different weapon behaviors. The MILES (Multiple Integrated Laser Engagement System) was developed in the 1970s and is now used by many countries for realistic combat training.
In underwater communication, semiconductor lasers are used for secure, interference-free transmission. Blue-green light (460–540 nm) is ideal for water penetration, allowing submarines to communicate with satellites or aircraft carriers. High-power multi-frequency semiconductor laser arrays are key components in this field.
Semiconductor lasers are also used for aiming and warning systems. Infrared lasers require night vision goggles for visibility, while visible red lasers allow direct targeting. Devices like the FA-4 laser sight are lightweight and effective for battlefield use. Laser warning systems have evolved to detect a wide range of wavelengths and improve angular resolution for better threat identification.
In satellite communication, semiconductor lasers enable efficient free-space optical transmission with minimal power and small telescopes. This technology supports high-speed data transfer between satellites and ground stations.
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