Lasers will be utterly useless. What makes you think they would do anything
to the ISS's orbit ???

Well photo-pressure for one thing, but really I was thinking about the
idea below.

I was assuming you could generate extra electrical power aboard the
ISS by hitting the PV-arrays with the proper wavelength. That
electrical power would be used to power the e-tethers with no impact
on the power budget of the ISS. Thus re-boost fuel would never have to
be brought up to the ISS again. I believe the ISS experiences about
three pounds of drag force at its median altitude. Is there any reason
given enough time, that the ISS could not be moved to L5, using lasers
and e-tethers to create a permanent space station?

The re-entry of skylab, the salyuts, and mir seem to be such a waste,
they too could have been placed at L1 and L5.