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高能化学氧碘激光(COIL)激光近场存在着大量的高频光,这部分光会对光束质量及强光通道附近的系统造成严重的危害,因此需要研究这些高频光在近场的传输规律。分析了各种不同的高频光的产生机理和特性,其中输出镜的衍射和高阶模对高频光的贡献最大,因此是主要研究对象。通过在光学通道内设置多个测试光阑测量了不同位置的能量,并根据该位置的空间角计算出高频光角谱。采用了三种不同的研究方法分别计算在不同出光时间下的角谱特征,得到了较一致的结果。研究结果表明高频光的角谱越往通道后端数值越大,当光束质量恶化时角谱值增大,通道内的能量损失增加。根据角谱曲线可以计算出每个防护光阑上的功率和能量,这为高能COIL激光系统热管理技术奠定了坚实的基础。
High-energy chemical oxygen-iodine laser (COIL) laser near the field there is a lot of high-frequency light, this part of the light beam quality and light channels near the system causing serious damage, it is necessary to study the transmission of these high-frequency light in the near field. The generation mechanism and characteristics of various high-frequency light are analyzed. Among them, the diffraction of the output mirror and the contribution of high-order mode to the high-frequency light are the largest, so it is the main research object. By setting a plurality of test apertures in the optical channel, the energy of different positions is measured, and the high-frequency light angular spectrum is calculated according to the spatial angle of the position. Three different research methods were used to calculate the angular spectrum characteristics at different light-out times respectively, and more consistent results were obtained. The results show that the larger the angle spectrum of high-frequency light toward the back end of the channel, the larger the angle spectrum value becomes when the beam quality deteriorates, and the energy loss in the channel increases. According to the angular curve, the power and energy of each aperture can be calculated, which lays a solid foundation for the thermal management of high-energy COIL laser system.