Wavelength tunable laser beam shaping.
Laser beam shaping by phase-only transformations, often referred to as field mapping, has for a long time been considered wavelength dependent. In this Letter we outline a simple mathematical argument that shows how the problem may be formulated in a wavelength tunable manner, requiring only a minor adjustment in the observation plane. We verify the theoretical prediction by experiment using the example of a Gaussian-to-flattop-beam transformation, and we show that the shaping is valid across a wide range of wavelengths for a single diffractive optical element.
Council for Scientific and Industrial Research (CSIR), P.O. Box 395, Pretoria 0001, South Africa. aforbes1@csir.co.za
Andrew
A
Forbes
Fred
F
Dickey
Mapule
M
DeGama
Anton
A
du Plessis