Codirectionally

ABCD is a quadrilateral inscribed in a circle; four forces act codirectionally with AB, BC, AD, DC, and are inversely proportional to these lines respectively; prove that their resultant is codirectional with the line joining the intersection of the tangents to the circle at B and D.

A third principal approach for a wide tuning is the application of a codirectionally coupled two-mode twin-waveguide laser structure.

Only codirectionally pumped fibers have been considered, pumping at 1017 nm.