[SlowBoat407]

The high-energy laser uses a liquid that has the same angle of refraction as the mirrors inside the blaster.

I'd give it more credence if they could get the terminology correct. I believe it's "index of refraction". The angle of refraction is the result of light passing from a medium of one refractive index into a medium of another refractive index.

[RATkiller]

But electromagnetic radiation is only bent (dispersed concentrated or changed direction) when transiting two media of different refractive indices. So if you match the indices of refraction the light stays on its original course.