A non-symmetrical theoretical model is used to describe the propagation of laser beams in dielectric capillary waveguides under non-ideal coupling conditions. The displacement of the laser beam focusing point from the capillary axis, the deviation of the transverse energy distribution from a symmetric one, and an angle of incidence different from zero modify, through the excitation and beating of several modes, the energy repartition during the propagation in the waveguides. The results of modeling are in very good agreement with experimental results, obtained with a low-intensity laser beam on a test bench, where good control of the laser energy distribution in the focal plane, the focusing point position, and the angle of incidence was achieved.
© 2010 Optical Society of America
Lasers and Laser Optics
Original Manuscript: January 25, 2010
Revised Manuscript: April 24, 2010
Manuscript Accepted: May 13, 2010
Published: June 17, 2010
M. Veysman, N. E. Andreev, K. Cassou, Y. Ayoul, G. Maynard, and B. Cros, "Theoretical and experimental study of laser beam propagation in capillary tubes for non-symmetrical coupling conditions," J. Opt. Soc. Am. B 27, 1400-1408 (2010)