An expression for the transmitted fraction of the uniform and parallel radiation incident upon the coupler between two rectangular light pipes of different physical dimensions is derived. It is a function of the pipe dimension ratio and the angle of the incident radiation. It is shown that for radiation nearly parallel to the pipe axis, it is possible to design a coupler for any pipe dimension ratio so that all the radiation incident upon it is transmitted by it. Design curves for various incidence angles and the pipe dimensions are presented.
© 1976 Optical Society of America
Original Manuscript: August 28, 1975
Published: November 1, 1976
M. D. Wagh, "Coupling efficiency between light pipes of different dimensions," Appl. Opt. 15, 2840-2843 (1976)