Indrisiunas, Simonas and Richter, Heiko and Grigelionis, Ignas and Janonis, Vytautas and Minkevicius, Linas and Valusis, Gintaras and Raciukaitis, Gediminas and Hagelschuer, Till and Hübers, Heinz-Wilhelm and Kasalynas, Irmantas (2019) Laser-processed diffractive lenses for the frequency range of 4.7 THz. Optics Letters, 44 (5), pp. 1210-1213. Optical Society of America. DOI: 10.1364/OL.44.001210 ISSN 0146-9592
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Official URL: https://doi.org/10.1364/OL.44.001210
Abstract
The development of diffractive lenses for the upper terahertz (THz) frequency range above 1 THz was successfully demonstrated by employing a direct laser ablation (DLA) technology. Two types of samples such as the Soret Zone plate lens and the multi-level phase-correcting Fresnel lens were fabricated of a metal foil and crystalline silicon, respectively. The focusing performance along the optical axis of a 4.745 THz quantum cascade laser beam with respect to the positioning angle of the sample was studied by using a realtime microbolometric camera. A binary-phase profile sample demonstrated the values of the focusing gain and focused beam size up to 25 dB and 0.15 mm (2.4λ), respectively. The increase of the phase quantization level to eight led to higher (up to 29 dB) focusing gain values without a measurable increase of optical losses. All the samples were tolerant to misalignment as large as 10 deg of oblique incidence with a focusing power drop no larger than 10%. The results pave the way for new applications of industry-ready DLA technology in the entire THz range.
Item URL in elib: | https://elib.dlr.de/126674/ | |||||||||||||||||||||||||||||||||
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Document Type: | Article | |||||||||||||||||||||||||||||||||
Title: | Laser-processed diffractive lenses for the frequency range of 4.7 THz | |||||||||||||||||||||||||||||||||
Authors: |
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Date: | 1 March 2019 | |||||||||||||||||||||||||||||||||
Journal or Publication Title: | Optics Letters | |||||||||||||||||||||||||||||||||
Refereed publication: | Yes | |||||||||||||||||||||||||||||||||
Open Access: | No | |||||||||||||||||||||||||||||||||
Gold Open Access: | No | |||||||||||||||||||||||||||||||||
In SCOPUS: | Yes | |||||||||||||||||||||||||||||||||
In ISI Web of Science: | Yes | |||||||||||||||||||||||||||||||||
Volume: | 44 | |||||||||||||||||||||||||||||||||
DOI : | 10.1364/OL.44.001210 | |||||||||||||||||||||||||||||||||
Page Range: | pp. 1210-1213 | |||||||||||||||||||||||||||||||||
Publisher: | Optical Society of America | |||||||||||||||||||||||||||||||||
ISSN: | 0146-9592 | |||||||||||||||||||||||||||||||||
Status: | Published | |||||||||||||||||||||||||||||||||
Keywords: | diffractive lense, laser-processing, THz | |||||||||||||||||||||||||||||||||
HGF - Research field: | Aeronautics, Space and Transport | |||||||||||||||||||||||||||||||||
HGF - Program: | Space | |||||||||||||||||||||||||||||||||
HGF - Program Themes: | Space Transport | |||||||||||||||||||||||||||||||||
DLR - Research area: | Raumfahrt | |||||||||||||||||||||||||||||||||
DLR - Program: | R RP - Raumtransport | |||||||||||||||||||||||||||||||||
DLR - Research theme (Project): | R - Raumfahrzeuge Entwurf, Systemanalyse, Simulation, Messtechnik | |||||||||||||||||||||||||||||||||
Location: | Berlin-Adlershof | |||||||||||||||||||||||||||||||||
Institutes and Institutions: | Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy | |||||||||||||||||||||||||||||||||
Deposited By: | Richter, Dr.rer.nat. Heiko | |||||||||||||||||||||||||||||||||
Deposited On: | 28 Feb 2019 08:20 | |||||||||||||||||||||||||||||||||
Last Modified: | 28 Feb 2019 08:20 |
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