准直误差对光束质量因子测量影响的理论与实验研究

发布时间：2018-02-01 20:05

本文关键词： 测量光束质量因子准直误差噪声　出处：《中国激光》2017年09期 　论文类型：期刊论文

【摘要】：测量激光光束质量(M~2)因子时一般要求光路准直,同时要求降低噪声对光斑半径测量的影响。光路偏移会导致CCD采集的光斑偏离CCD中心,噪声使偏移光束的光斑半径和M~2因子的测量值存在额外误差。针对含噪声且光路偏移CCD中心的情况,提出了一种测量M~2因子的改进方法,即当光路不准直时,在光路每个位置采集两个不同偏移量的光斑,则可校正得到光斑半径的真实值,从而得到无准直误差的M~2因子。理论推导了激光光束的光斑半径和M~2因子与偏移量的变化关系,通过数值仿真和实验研究了偏移光束的光斑半径和M~2因子随偏移量的变化,二者结果一致,验证了所提方法的可靠性。
[Abstract]:When measuring the quality of laser beam, the optical path collimation is generally required, and the influence of noise on the measurement of spot radius is also required. The shift of optical path will cause the spot collected by CCD to deviate from the center of CCD. Noise causes additional errors in the radius of light spot of the offset beam and the measured value of factor M ~ 2. An improved method for measuring the Mi _ 2 factor is proposed for the case of the noise and the light path shifting to the center of CCD. That is, when the optical path is not straight, two different offset spots are collected at each position of the optical path, then the true value of the spot radius can be corrected. Thus, we get the M2 factor without collimation error. The relation between the laser beam spot radius and M2 factor and the deviation is derived theoretically. By numerical simulation and experiment, the variation of the spot radius and Mn-2 factor of the offset beam with the offset is studied. The results are consistent with each other, and the reliability of the proposed method is verified.
【作者单位】：四川大学电子信息学院激光微纳工程研究所;
【基金】：国家自然科学基金(11574221)
【分类号】：TN24
【正文快照】： 光束质量[1-3]是评价激光光束的重要指标之一,对激光的理论研究和应用具有重要意义[4]。国际标准化组织推荐将M2因子[5-7]作为标准的评价光束质量的指标。通常采用CCD测量M2因子[1],即采用CCD在光束传输方向上对多个不同位置处的光斑进行测量并计算相应的光斑大小[8-9],然后通

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