摘要
采用三种不同束宽定义方法:熵束宽、环围功率和渐近分析法,研究比较了截断高斯光束的光束传输因子(M^2因子)和高斯光束通过光阑-透镜分离光学系统的焦移.结果表明,随截断参数δ的增大,三种方法计算的M^2因子差异变小.当δ≥2.1时其M^2因子都趋于1,且三种方法计算的相对焦移亦相等。
By using three different definitions of the beam width： the entropy-based width, power in the bucket and asymptotic analysis, the Beam propagation factor （ M^2 factor） of tnmcated Gaussian beams and the focal shift of Gaussian beams passing through an aperture-lens separated system are studied and compared. It is shown that with increasing truncation parameter δ, the difference of the M^2 factor calculated by means of these three methods becomes small. If δ≥2.1, the M^2 factor approaches 1 and the focal shift calculated by using these three methods is equal.
出处
《华东交通大学学报》
2009年第6期93-97,共5页
Journal of East China Jiaotong University
基金
华东交通大学科学技术研究项目(08JC04)
关键词
环围功率
渐近分析法
截断高斯光束
M^2因子
焦移
entropy-based width
power in the bucket
asymptotic analysis
truncated Ganssian beam
M2 factor
focal shift
