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 (${95}\;{\pm}\;{5}\%$) and a good agreement between the measured and expected intensity distribution in the focal plane.

中文翻译：

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具有连续轮廓的钻石衍射透镜，可实现强大的太赫兹辐射

太赫兹（THz）光源辐射功率的增加要求开发与之配合使用的新光学器件。提出了激光辅助复制技术，以制造出在THz范围内具有连续轮廓的金刚石圆柱衍射透镜。该过程涉及通过激光烧蚀对硅衬底进行反向结构化，以利用化学气相沉积工艺将其进一步复制到金刚石表面。用自由电子激光在141 µm波长下进行的透镜测试表明，衍射效率高（$ {95} \; {\ pm} \; {5} \％$），并且测量值之间有很好的一致性和焦平面上的预期强度分布。