Unpolarising Light: Can You 'Rescatter' the E and B Fields?

[KingBigness]

When light is emitted from a source it is nearly always unpolarised meaning the E and B fields lie in randomly directed mutually perpendicular planes. When Light goes through a polarising filter it causes the fields to uniform mutually perpendicular planes.

My question is however, once light is polarised can you 'unpolarise' the light? In otherwords can you 'rescatter' the E and B fields?

 

[Matterwave]

Sure, reflect the light off a (jaggedy) surface should do the trick.

 

[Cantstandit]

Isn't reflected light always polarised?

 

[Andy Resnick]

When light is emitted from a source it is nearly always unpolarised meaning the E and B fields lie in randomly directed mutually perpendicular planes. When Light goes through a polarising filter it causes the fields to uniform mutually perpendicular planes.

My question is however, once light is polarised can you 'unpolarise' the light? In otherwords can you 'rescatter' the E and B fields?

Converting fully polarized light to randomly polarized light is not trivial and generally requires multiple scattering (either from a rough surface, a pair of counter-rotating ground glass plates, or something called a 'scrambler' http://www.klccgo.com/cqmscramb.htm).