Study of the broadband radiation intensity distribution formed by diffractive optical elements

The results of study of the chromatic properties of the DOE for controlling the laser ablation are presented. Both the effects of the DOE-fabrication-related deviation of the designed wave-length and the spectrum broadening due to short pulse duration are considered. The first phenomenon is investigated experimentally in a model with a continuous laser, while the second is investigated in real ablation of metal films deposited on a dielectric substrate. It is shown that the deviation from the designed wavelength can be used to perform a desired transformation of the focal area. The phenomena associated with the spectrum broadening do not lead to any significant effects for the selected parameters of the laser beam.