De or het laserstraling?

The correct Dutch article is:

de laserstraling

Rule Words ending in -ing: almost always de. See the rule

How to use laserstraling

the laserstralingde laserstraling
this laserstralingdeze laserstraling
that laserstralingdie laserstraling
our laserstralingonze laserstraling
your laserstralingjouw laserstraling
every laserstralingelke laserstraling
which laserstraling?welke laserstraling?
a big laserstraling / the big laserstralingeen grote laserstraling, de grote laserstraling