通过实验，我们发现在经过无色散的ABCD系统时彩色光束的M2因子是不变的。
The chromatic factor M2 is found invariable while the laser beam propagates through the dispersion-free ABCD system.
模拟结果表明，对于一个放大系统，存在一个最佳的材料色散，用它可以获得最大的无色散带宽。
The computer simulation with the formula demonstrates that there exists an optimal material dispersion for an amplification system, with which we can achieve the largest dispersion free bandwidth.
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