Coupling of Laser Light to Optical Fibers

Abstract

This paper desribes a proceudure for calculating the coupling efficiencybetween two Gaussian beams with an emphasis on laser-diode light to single-mode fiber coupling. First, the concept of ray matrices is discussed and the ray matrices for lenses are derived. Second, spotsizesand the beam waist positions of transformed beams are calculated. Third, coupling efficiencies between two Gaussian beams are obtained in a general form. Finally, coupling characteristics are disscussed for various lens systems.