Experimental study demonstrates fabrication of a four-level silicon terahertz Fresnel lens using femtosecond laser ablation, indicating a reliable manufacturing route for terahertz optics.
The possibility of fabricating a silicon diffractive four-level THz Fresnel lens by laser ablation is studied. For a microrelief to be formed on the sample surface, use is made of a femtosecond Yb : YAG laser with a high pulse repetition rate . Characteristics of the diffractive optical element are investigated in the beam of a free-electron laser. The measured diffraction efficiency of the lens is in good agreement with the theoretical estimate.
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Комленок et al. (2015) studied this question.
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