Polarization sensitive beam splitter

An optical device, comprising:

• a first polarization selective reflector positioned in a first orientation to:
• receive first light in a first direction;
• redirect a first portion, of the first light, having a first polarization to a second direction that is non-parallel to the first direction;
• and
• receive second light in a third direction and transmits at least a first portion, of the second light, having a second polarization orthogonal to the first polarization;
• a second polarization selective reflector positioned in a second orientation non-parallel to the first orientation to:
• receive third light in a fourth direction;
• redirect a first portion, of the third light, having the first polarization to a fifth direction that is non-parallel to the fourth direction;
• and
• receive fourth light in a sixth direction and transmits at least a first portion of the fourth light having the second polarization;
• and
• a third reflector positioned to receive from the second polarization selective reflector a second portion of the first light having the second polarization, transmitted by the first polarization selective reflector and the second polarization selective reflector, and redirect the second portion of the first light back to the second polarization selective reflector as the third light.