[Laser] Polarization Subtraction

[Tom Becker]

FWIW, I just found that an inexpensive 635nm red laser diode emits 
linearly-polarized light - but a 532nm green emits a non-polarized 
beam.  Does that suggest a laser diode might be used as a 
polarization-sensitive sensor? [Or only that frequency doubling scatters 
polarization?]

I have no idea if it's feasible but, if there exists usable sensitivity 
from a laser diode used as a sensor, a pair of them at right-angles 
might provide differential polarization detection without filters, at 
least in the red.


Tom