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
P.R. Lawson, D.M.A. Wilson, and R.C. Boysen, "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," Appl. Opt. 37, 8129-8130 (1998)