focused gaussian beam fdtd

Hi all,

I'd like to implement (spatially) focused gaussian beam as a incident beam into my FDTD code. For this purpose, what can I do that?
I think TF/SF technique is widely used for plane wave implementation but can not be used anymore for gaussian. Am I right?

Any comments, codes(program) or web link would be greatly helpful for me!

Thanks!

Jae

i need it also
if you get it send it to me