M
2
-factor of high-power laser beams through a multi-apertured
ABCD
optical system
Zeng Xiangmei
1, †
, Zhang Meizhi
1
, Cao Dongmei
2
, Sun Dingyu
1
, Zhou Hua
1
M
min
2
versus
π
0
or
δ
A
2
.
