Hope this helps
photovoltaic cells similar to what NASA used: http://www.ise.fhg.de/english/fields/field2/mb6/pubdown/PVCells_eng.pdf
Disk lasers like what NASA used:
http://www-opto.e-technik.uni-ulm.de/forschung/jahresbericht/2001/ar01es.pdf
Note: NASA didn't use either of these but the technology is similar.
