In high energy Q-switched Nd:YAG lasers using supergaussian VRM shows spatial profile with rings Why? are they diffraction rings? if so how it comes?

http://ekspla.cn/wp-content/uploads/2012/11/NL230-datasheet-2.pdf see the figure 1 at page 4 of the above said link

29 January 2018 5,176 7 View