Including LaTeX font in PowerPoint chart
(cut-n-paste from my answer to a similar question from Super User)
That default TeX font is called Computer Modern, which might help you in your search. And in the wikipedia link I find
- Computer Modern typeface in TrueType format and OpenType.
- Computer Modern Unicode fonts X11 licensed
and others which are probably just what you need.
They are available for download: http://www.ctan.org/tex-archive/fonts/lm/fonts/opentype/public/lm/
Look for lmroman10-regular.otf and other sizes/shapes.
How to install them is off topic here (and I wouldn't be able to anser this question anyway :-))
IguanaTeX is "A Free LaTex Add-In for PowerPoint" similar to TeX4ppt (or TeX4ppt with enhancements) or TeXpoint.