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Retroreflector Target for Co-aligning a Pair of Counter-propagating Optical Beams: Or How to Find a Star While Looking Down a Very Long Pipe

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Abstract

The use of a retroreflector is described for co-alignment of two optical beams that are collimated but propagating in opposite directions. This method is applicable to any optical system that requires precise pointing, such as laser-ranging and tracking systems. The application illustrated here is star acquisition in long-baseline stellar interferometry.

© 1998 Optical Society of America

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