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Matches in SemOpenAlex for { <https://semopenalex.org/work/W3169095971> ?p ?o ?g. }

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• W3169095971 abstract "We present the fabrication and characterization of 3 dB asymmetric directional couplers for the astronomical K-band at wavelengths between 2.0 and 2.4 µm. The couplers were fabricated in commercial Infrasil silica glass using an ultrafast laser operating at 1030 nm. After optimizing the fabrication parameters, the insertion losses of straight single-mode waveguides were measured to be <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mo>∼<!-- ∼ --></mml:mo> </mml:mrow> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mn>1.2</mml:mn> </mml:mrow> <mml:mspace width=thickmathspace /> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mo>±<!-- ± --></mml:mo> </mml:mrow> </mml:mrow> <mml:mspace width=thickmathspace /> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mn>0.5</mml:mn> </mml:mrow> <mml:mspace width=thickmathspace /> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mi mathvariant=normal>d</mml:mi> <mml:mi mathvariant=normal>B</mml:mi> </mml:mrow> </mml:mrow> </mml:math> across the full K-band. We investigate the development of asymmetric 3 dB directional couplers by varying the coupler interaction lengths and by varying the width of one of the waveguide cores to detune the propagation constants of the coupled modes. In this manner, we demonstrate that ultrafast laser inscription is capable of fabricating asymmetric 3 dB directional couplers for future applications in K-band stellar interferometry. Finally, we demonstrate that our couplers exhibit an interferometric fringe contrast of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mo>><!-- > --></mml:mo> </mml:mrow> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mn>90</mml:mn> </mml:mrow> </mml:mrow> <mml:mi mathvariant=normal>%<!-- % --></mml:mi> </mml:math> . This technology paves the path for the development of a two-telescope K-band integrated optic beam combiner for interferometry to replace the existing beam combiner (MONA) in Jouvence of the Fiber Linked Unit for Recombination (JouFLU) at the Center for High Angular Resolution Astronomy (CHARA) telescope array." @default.
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• W3169095971 date "2021-08-04" @default.
• W3169095971 modified "2023-10-14" @default.
• W3169095971 title "Ultrafast laser inscription of asymmetric integrated waveguide 3 dB couplers for astronomical K-band interferometry at the CHARA array" @default.
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• W3169095971 doi "https://doi.org/10.1364/josab.423727" @default.
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