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Laser-processed diffractive lenses for the frequency range of 4.7 THz

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/
Document Type:Article
Title:Laser-processed diffractive lenses for the frequency range of 4.7 THz
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Indrisiunas, SimonasCenter for Physical Sciences and Technology, Vilnius, LithuaniaUNSPECIFIED
Richter, HeikoHeiko.Richter (at) dlr.deUNSPECIFIED
Grigelionis, IgnasCenter for Physical Sciences and Technology, Vilnius, LithuaniaUNSPECIFIED
Janonis, VytautasCenter for Physical Sciences and Technology, Vilnius, LithuaniaUNSPECIFIED
Minkevicius, LinasCenter for Physical Sciences and Technology, Vilnius, LithuaniaUNSPECIFIED
Valusis, GintarasCenter for Physical Sciences and Technology, Vilnius, LithuaniaUNSPECIFIED
Raciukaitis, GediminasCenter for Physical Sciences and Technology, Vilnius, LithuaniaUNSPECIFIED
Hagelschuer, TillTill.Hagelschuer (at) dlr.deUNSPECIFIED
Hübers, Heinz-Wilhelmheinz-wilhelm.huebers (at) dlr.deUNSPECIFIED
Kasalynas, Irmantasirmantas.kasalynas (at) ftmc.ltUNSPECIFIED
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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