R P Ratowsky

Laser diode to single-mode fiber ball lens coupling efficiency: full-wave calculation and measurements.

R. P. Ratowsky, J S Kallman, R. Deri, 1997, Applied optics.

Ball lens reflections by direct solution of Maxwell's equations.

R. P. Ratowsky, J S Kallman, R. Deri, 1995, Optics letters.