Fabrication of a multilevel THz Fresnel lens by femtosecond laser ablationстатья
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Дата последнего поиска статьи во внешних источниках: 5 сентября 2016 г.
Аннотация: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 (f = 200 kHz). Characteristics of the diffractive optical element are investigated in the beam of a 141-mm free-electron laser. The measured diffraction efficiency of the lens is in good agreement with the theoretical estimate.