In this paper, we explore theoretically and experimentally the laser beam shaping ability resulting from the coaxial superposition of two coherent Gaussian beams (GBs). This technique is classified under interferometric laser beam shaping techniques contrasting with the usual ones based on diffraction. The experimental setup does not involve the use of some two-wave interferometer but uses a spatial light modulator for the generation of the necessary interference term. This allows one to avoid the thermal drift occurring in interferometers and gives a total flexibility of the key parameter setting the beam transformation. In particular, we demonstrate the reshaping of a GB into a bottle beam or top-hat beam in the focal plane of a focusing lens.
© 2013 Optical Society of America
Lasers and Laser Optics
Original Manuscript: May 28, 2013
Revised Manuscript: July 18, 2013
Manuscript Accepted: July 18, 2013
Published: August 7, 2013
Boualem Boubaha, Darryl Naidoo, Thomas Godin, Michael Fromager, Andrew Forbes, and Kamel Aït-Ameur, "Spatial properties of coaxial superposition of two coherent Gaussian beams," Appl. Opt. 52, 5766-5772 (2013)