Patent ID: 7750286

Claim:
A device, comprising: a spatial light modulator (SLM); a polarization beam splitter (PBS) optically coupled to the SLM; a mirror optically coupled to the PBS; and first and second quarter-wave plates, wherein: the PBS is adapted to direct an input beam to the mirror; the mirror is adapted to reflect the beam received from the PBS back to the PBS, wherein the first quarter-wave plate imparts on the reflected beam a first polarization that causes the PBS to direct said reflected beam to the SLM; and the SLM is adapted to spatially modulate the beam received from the PBS and direct a resulting spatially modulated beam back to the PBS, wherein the second quarter-wave plate imparts on said spatially modulated beam a second polarization that causes the PBS to direct said spatially modulated beam to an output port to form an output beam.