Translator Disclaimer
23 August 2005 Laser beam shaping by double tailoring
Author Affiliations +
In several previous publications we have outlined how a freeform optical surface can be tailored to achieve a desired irradiance on a reference surface. The shape of the surface is determined by numerically solving a differential equation. This approach has the advantage of being able to accommodate a huge amount of detail, equivalent to several thousand to millions of parameters for which classical optimisation techniques are not feasible. Laser beam shaping requires controlling the phase of the wave front as well. One surface is not sufficient, but two surfaces can be calculated by simultaneously solving a system of coupled differential equations. Justin L. Kreuzer patented this idea in 1965 (US Patent No. 3476463). Wassermann and Wolf outlined already in 1949 a procedure by which two aspheric surfaces are determined by solving differential equations such as to render an imaging optical system aplanatic. The work of Kreuzer as well as that of Wassermann and Wolf refers to rotational systems, where the cross section curve suffices to determine the surface and the equations are less demanding. We show how to extend the method of three-dimensional tailoring to simultaneously tailor two surfaces which are not necessarily rotationally symmetric, such as to achieve non-rotational irradiance distributions or off-axis devices. The desired irradiance translates into an equation which combines the first and the second derivatives of the surfaces.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Harald Ries "Laser beam shaping by double tailoring", Proc. SPIE 5876, Laser Beam Shaping VI, 587607 (23 August 2005);


Some properties of Mertz type aspheric surfaces
Proceedings of SPIE (September 17 2007)
Random thoughts on Monte Carlo tolerancing
Proceedings of SPIE (September 20 2007)

Back to Top