共查询到19条相似文献,搜索用时 125 毫秒
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利用光腔衰荡光谱技术,建立了氧碘化学激光器腔镜高反射率的精密测量系统。对用直型衰荡光腔时可能影响测量系统精度的各种因素进行了系统的实验研究。采用直型和折叠型衰荡光腔,检测了氧碘化学激光器高反腔镜在1.315μm的反射率。实验测得COIL凹面高反腔镜反射率为99.770%;平面高反镜反射率为99.917%,测量精度约为10-5。结果表明,该系统可以精密测量氧碘化学激光器腔镜的高反射率,测量结果精确可靠。 相似文献
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Output beam drift and deformation in high-power COIL 总被引:1,自引:0,他引:1
During the operation of a chemical oxygen iodine laser (COIL) with an unstable resonator of a large Fresnel number, as the output power increases, an instability of the output laser beam will appear, behaving mainly as far-field beam spot drift and deformation. In order to interpret this phenomenon, thermal expansion analysis on the scraper with finite element analysis method and a simulation of the output beam mode of this kind of laser by the method of Fast Fourier Transform were developed. From the experimental measurement and the calculation, we proposed that the presence of the nonuniform temperature distribution of scraper causes the front surface of the scraper to tilt and bulge due to thermal expansion. As the output power is increasing, all the mirror surfaces, especially the scraper's, will absorb more and more heat, causing thermal expansion of the mirror front surface to occur more seriously, thus resulting in the tilting and deformation of the far-field beam spot. The initial misalignment of the direction is also an important factor leading to the far-field beam spot drift and deformation. 相似文献
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圆形高斯镜平凹腔腔镜变形时激光模场分析 总被引:1,自引:2,他引:1
把圆形高斯镜平凹腔自再现模的衍射积分方程转化为有限阶的矩阵方程,在平面输出镜呈高斯分布的镜面变形时,数值计算了激光场模式的场强、相位分布和模式本征值。结果表明,当变形量较小时,随着变形量的增加,镜面上光场的分布范围增大,也就说明模体积增大,但镜面光场仍保持拉盖尔-高斯光束基模特征,相位由平面慢慢变得凸起,远场分布变化不明显。当变形量较大时,光场分布开始发生畸变。从模式本征值的变化看,在一定的变形范围内,本征值下降不多,说明较小的变形量对激光损耗影响不大,仍能使激光较稳定输出。在圆形高斯镜平凹腔输出镜发生不大的高斯状变形的情况下,仍有维持输出高质量激光束的能力。 相似文献
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