Komlenok Maxim, Kononenko Taras, Sovyk Dmitry, Pavelyev Vladimir, Knyazev Boris, Ashkinazi Evgeny, Reshetnikov Anton, Komandin Gennadii, Pashinin Vladimir, Ralchenko Victor, Konov Vitaly
Opt Lett. 2021 Jan 15;46(2):340-343. doi: 10.1364/OL.414097.
An increase in the radiation power of terahertz (THz) sources requires the development of new optics working with it. The laser-assisted replication technique is proposed to fabricate the diamond cylindrical diffractive lens with a continuous profile for the THz range. The procedure involves the inverted structuring of a silicon substrate by laser ablation for its further replication to the diamond surface utilizing the chemical vapor deposition process. Testing of the fabricated lens performed with a free-electron laser at the wavelength of 141 µm has demonstrated high diffraction efficiency (95±5) and a good agreement between the measured and expected intensity distribution in the focal plane.
太赫兹（THz）源辐射功率的增加需要开发与之配合的新型光学器件。本文提出采用激光辅助复制技术来制造用于太赫兹波段的具有连续轮廓的金刚石圆柱衍射透镜。该工艺包括通过激光烧蚀对硅衬底进行反向结构化处理，以便利用化学气相沉积工艺将其进一步复制到金刚石表面。利用波长为141 µm的自由电子激光对制造的透镜进行测试，结果表明其具有高衍射效率（95±5），并且焦平面上的测量强度分布与预期分布吻合良好。
