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Silicon diffractive optical element with piecewise continuous profile to focus high-power terahertz radiation into a square area

Maxim S. Komlenok, Taras V. Kononenko, Vitaly I. Konov, Yulia Yu. Choporova, Natalya D. Osintseva, Boris A. Knyazev, Vladimir S. Pavelyev, Konstantin N. Tukmakov, and Victor A. Soifer

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Abstract

A technique of high-frequency laser ablation using a 2D beam scanner has been designed and applied to creation of a silicon diffractive optical element (DOE) with a continuous profile to focus a terahertz Gaussian beam into a square region. The microrelief of the resulting silicon DOE has been analyzed with a white-light interferometer and a scanning electron microscope. The distribution of radiation behind the DOE illuminated by a high-power beam of the Novosibirsk free-electron laser at a wavelength of 130 µm, recorded with a pyroelectric camera, has been demonstrated. The measured diffraction efficiency of the DOE is equal to ${{97}}\;{{\pm}}\;{{2}}\%$.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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