Diamond diffractive lens with a continuous profile for powerful terahertz radiation
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2020-12-10 |
| Journal | Optics Letters |
| Authors | Š. Š”. ŠŠ¾Š¼Š»ŠµŠ½Š¾Šŗ, T. V. Kononenko, Š. Š. Š”Š¾Š²ŃŠŗ, Vladimir Pavelyev, B. A. Knyazev |
| Institutions | Image Processing Systems Institute, Novosibirsk State University |
| Citations | 10 |
Abstract
Section titled āAbstractāAn 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 Āµm has demonstrated high diffraction efficiency ( <mml:math xmlns:mml=āhttp://www.w3.org/1998/Math/MathMLā display=āinlineā> <mml:mrow class=āMJX-TeXAtom-ORDā> <mml:mn>95</mml:mn> </mml:mrow> <mml:mspace width=āthickmathspaceā/> <mml:mrow class=āMJX-TeXAtom-ORDā> <mml:mo>Ā±</mml:mo> </mml:mrow> <mml:mspace width=āthickmathspaceā/> <mml:mrow class=āMJX-TeXAtom-ORDā> <mml:mn>5</mml:mn> </mml:mrow> <mml:mi mathvariant=ānormalā>%</mml:mi> </mml:math> ) and a good agreement between the measured and expected intensity distribution in the focal plane.