Lossless beam-cleaning for linear CO2 waveguide laser arrays

Year: 1996

Authors: Lapucci A., Lescroart G., Bourdet G.L.

Autors Affiliation: Istituto Nazionale di Ottica, largo E. Fermi 6, 50125 Firenze, Italy
Laboratoire d’Optique Appliquee, Ecole Natlonale Supeneure de Techniques
Avancees, Ecole Polytechmque,

Abstract: The undesired side lobes in the far field emission of a linear array of phase coupled lasers can be reduced by using a single phase correcting mirror outside the laser array cavity. Even in that case the beam has strong asymmetry and astigmatism, that can be corrected by an off-axis spherical mirror. This paper shows the beam obtained experimentally with this kind of correction. The global optical set-up consists in three reflective optical elements producing a lossless transformation of the field distribution from a periodic repetition of small highly divergent sources to a quasi-gaussian symmetric beam.

Conference title: CLEO/Europe ‘96

KeyWords: Diffraction; High power lasers; Laser beams; Mirrors; Optical waveguides; Phase modulation, Angle of incidence; Beam shaping process; Carbon dioxide waveguide laser arrays; Lossless beam cleaning; Optical beam shaping chain; Phase coupled lasers; Plane mirror; Single phase correcting mirror; Spherical mirror; Talbot filtering cavity, Carbon dioxide lasers