An apparatus comprising: an optical combiner configured to combine a first optical beam having an adjusted first polarization with a second optical beam having an adjusted second polarization into an output beam having a third polarization, wherein the third polarization is a linear combination of the adjusted first polarization and the adjusted second polarization; wherein the optical combiner comprises: a first transparent surface, wherein the first optical beam with a first polarization and the second optical beam with a second polarization enter the optical combiner at the first transparent surface; a first reflective surface to reflect the first optical beam and rotate the first polarization to the adjusted first polarization, wherein the first optical beam propagates through the optical combiner from the first transparent surface to the first reflective surface; a second reflective surface to reflect the second optical beam and rotate the second polarization to the adjusted second polarization, wherein the second optical beam propagates through the optical combiner from the first transparent surface to the second reflective surface; a partially reflective surface substantially perpendicular to the first transparent surface to combine the first beam with the adjusted first polarization and the second beam with the adjusted second polarization into the output beam; at least one second transparent surface, wherein the output beam exits the optical combiner at the at least one second transparent surface. an optical combiner configured to combine a first optical beam having an adjusted first polarization with a second optical beam having an adjusted second polarization into an output beam having a third polarization, wherein the third polarization is a linear combination of the adjusted first polarization and the adjusted second polarization; wherein the optical combiner comprises: a first transparent surface, wherein the first optical beam with a first polarization and the second optical beam with a second polarization enter the optical combiner at the first transparent surface; a first reflective surface to reflect the first optical beam and rotate the first polarization to the adjusted first polarization, wherein the first optical beam propagates through the optical combiner from the first transparent surface to the first reflective surface; a second reflective surface to reflect the second optical beam and rotate the second polarization to the adjusted second polarization, wherein the second optical beam propagates through the optical combiner from the first transparent surface to the second reflective surface; a partially reflective surface substantially perpendicular to the first transparent surface to combine the first beam with the adjusted first polarization and the second beam with the adjusted second polarization into the output beam; at least one second transparent surface, wherein the output beam exits the optical combiner at the at least one second transparent surface. a first transparent surface, wherein the first optical beam with a first polarization and the second optical beam with a second polarization enter the optical combiner at the first transparent surface; a first reflective surface to reflect the first optical beam and rotate the first polarization to the adjusted first polarization, wherein the first optical beam propagates through the optical combiner from the first transparent surface to the first reflective surface; a second reflective surface to reflect the second optical beam and rotate the second polarization to the adjusted second polarization, wherein the second optical beam propagates through the optical combiner from the first transparent surface to the second reflective surface; a partially reflective surface substantially perpendicular to the first transparent surface to combine the first beam with the adjusted first polarization and the second beam with the adjusted second polarization into the output beam; at least one second transparent surface, wherein the output beam exits the optical combiner at the at least one second transparent surface.