Abstract
We demonstrate a modulated retroreflector that utilizes large- area multiple quantum well modulators on all three faces of a retroreflec- tor. The large-area devices, fabricated by metalorganic chemical vapor deposition, are characterized in terms of the yield and leakage currents. A yield higher than that achieved previously using devices fabricated by molecular beam epitaxy is observed. The retroreflector module is con- structed using a standard FR4 printed circuit board PCB technology, thereby simplifying the wiring issue. A high optical contrast ratio of 8.23 dB is observed for a drive of 20 V. A free-standing PCB retroreflec- tor is explored and found to have insufficient angular tolerances ±0.5 deg. We show that the angular errors in the corner-cube con- struction can be corrected for using off-the-shelf optical components as opposed to mounting the PCBs on a precision corner cube, as has been done previously. © 2009 Society of Photo-Optical Instrumentation Engineers. DOI: 10.1117/1.3249750
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