LD-pumped Nd:YVO4 solid-state lasers possess characteristics such as high efficiency, simplicity, compactness, and excellent beam quality. Higher peak power and narrower pulse width can be achieved through the use of a BBO single electro-optic Q-switching crystal. This article explores the incorporation of Cr4+:YAG in to a BBO single electro-optic Q-switching laser to form a dual-Q laser. Experiments have shown that, at a pumping power of10W, the pulse widths of the dual-Q laser and the single electro-optic Q-switching laser are 6.8ns and16.6nsrespectively. At a pumping power of 15W, the highest peak power achieved is 30KW, representing a 19.09%increase compared to the 25.19KW of the single electro-optic Q-switching laser.
The infrared imaging optical system is obviously affected by the temperature change, so it is necessary to carry out non-thermal design to improve the imaging quality. Medium and long wave dual-band infrared imaging technology can acquire the infrared radiation information of medium and long wave at the same time, in this paper, an infrared imaging system is designed to achieve dual-band infrared imaging, and non-thermal processing, improve the quality of infrared image.
In the long-distance and high-precision Laser 3D imaging system, the response efficiency of the imaging detector in the near-infrared band is much less than that in the visible band, so the system requires higher output power of the 1064nm laser source, the laser is required to have high efficiency, small volume, good beam quality, high peak power and other output characteristics. In this paper, a complementary absorption technique of Nd:YAG / Nd:YVO4 twin-crystal laser is presented, in which the wide-spectrum absorption characteristics of Nd:YVO4 laser crystal are complementary to the good thermophysical properties of Nd:YAG Laser Crystal, greatly enhance the laser output characteristics.
The laser three-dimensional imaging system can capture the three-dimensional image information of the target. Compared with the traditional two-dimensional image, the three-dimensional image provides more data dimensions and contains more comprehensive target information, which greatly improves the recognition ability of imaging weapons. Laser 3D imaging is mainly divided into scanning and non-scanning. Compared with scanning imaging, non-scanning 3D imaging has the characteristics of compact structure, fast imaging speed, high range resolution and large field of view. The existing non scanning laser 3D imaging systems mainly include streak tube laser 3D imaging system, APD area array laser 3D imaging system and range gated laser 3D imaging system. Among them, range gated 3D imaging technology has become the main research direction of long-distance laser 3D imaging system because of its advantages of clear imaging, high signal-to-noise ratio and free from the influence of atmospheric backscattering. In this paper, a new laser three-dimensional imaging technology is proposed, which is called pulse laser three-dimensional imaging technology based on pulse slice. This technology not only has the technical advantages of distance gated laser three-dimensional imaging, but also can use CCD (or CMOS) optical sensor with large-scale pixel array, At the same time, it overcomes the limitation of pulse width on longitudinal distance resolution in range gated laser 3D imaging and can improve the longitudinal distance resolution by more than one order of magnitude. This paper describes the basic principle, exposure process analysis and imaging processing method of pulse slicing laser 3D imaging technology.
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