Practical Technology Research On Illuminati On Using Infrared Laser Instrument

The development of the field of security and protection makes the emerging of intelligent video technology. The demand for dynamic monitoring in the night is highly increasing. Remote tracking and monitoring in the night has been widely used in oil, mining, scenic, forest fire prevention, and traffic engineering and urban anti-terrorism. Active infrared night vision technology actively illuminates the targets by a light source, and then makes use of the infrared light reflected by target to realize the target monitoring. The most common light source that producing the invisible infrared light is array type LED light. The electro-optical conversion rate of this light source is only 25%. The excess energy is converted into heat. So the power dissipation is very high. The irradiation distance is only tens of meters, which cannot meet the monitoring requirement for remote tracking and monitoring. As new generation infrared light source, the electro-optical conversion rate of semiconductor laser is higher than 50%. The direction and color of emitted laser are incomparable, that makes the semiconductor laser different from LED technology. The purpose of this subject is to obtain practical infrared semiconductor laser light source with low cost and different power through different methods in order to meet the market demands. The optimization of laser encapsulation process and reduction of the thermal resistance of laser chip can improve the service life and performance. The development on optical fiber and the assembly, grinding and polishing process of optical fiber beam can make the end of fiber to meet the requirements of the infrared laser coupling. The reliability of laser chip and high transmittance of optical fiber and fiber bundle can process the fiber coupling and spot homogenization. LD beam is elliptical Gaussian beam, which has a large vertical divergence angle and uneven spot with the shape of several strip due to the presence of higher-order modes. If LD beam is used directly for lighting, the lighting effect is so poor that the beam must be shaped into circle and spot homogenization. This subject develops the program that multimode single fiber or fiber bundle, or elliptical microlens or binary optical element is used to shape the LD beam into circle and homogenize the spot. The program has simple structure, a small number of system optics, high coupling efficiency, suitable for the production of small and high-power light source.The current common solution is to compress and overlap the spot from two lasers, so that the dark stripes can get brighter in order to improve the homogenization. This paper provides another low-cost practical solution to solve the problem of spot homogenization using optical fiber and optical homogenizing pieces.To realize the monitoring of a few kilometers, laser light source adopts array encapsulation. The laser is output by fiber core binding after the spot is compressed and fiber coupling. The obtained product has high output power, reliable performance, and flexible utilization and better spot homogenization.The laser beam is focused and coupled into the single fiber after its shaping and transformation by micro-optics element. The coupling laser with single pipes has small size, high power density, high brightness and good beam quality, which can meet the special requirements of infrared lighting system.Finally, the improvement on the docking methods of the fiber can increase the efficiency of docking and output of infrared laser. It can meet the homogenization of spot and improve the infrared laser irradiation intensity and irradiation distance.