Modal noise mitigation in a photonic lantern fed near-IR spectrograph

2020 ◽  
Author(s):  
Fraser A. Pike ◽  
Aurélien Benoît ◽  
David G. MacLachlan ◽  
Robert J. Harris ◽  
Itandehui Gris-Sánchez ◽  
...  
Keyword(s):  
Noise Mitigation ◽  
Near Ir ◽  
Modal Noise

Scrambling and modal noise mitigation in the Habitable Zone Planet Finder fiber feed

2014 ◽  
Author(s):  
Arpita Roy ◽  
Samuel Halverson ◽  
Suvrath Mahadevan ◽  
Lawrence W. Ramsey
Keyword(s):  
Habitable Zone ◽  
Noise Mitigation ◽  
Modal Noise

Modal Noise Mitigation in 850-nm VCSEL-Based Transmission Systems Over Single-Mode Fiber

2016 ◽  
Vol 64 (10) ◽  
pp. 3342-3350 ◽  
Author(s):  
Jacopo Nanni ◽  
Simone Rusticelli ◽  
Carlos Viana ◽  
Jean-Luc Polleux ◽  
Catherine Algani ◽  
...  
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Noise Mitigation ◽  
Transmission Systems ◽  
Modal Noise

Fiber modal noise mitigation by a rotating optical double scrambler

2020 ◽  
Author(s):  
Gert Raskin ◽  
Jacob Pember ◽  
Dmytro Rogozin ◽  
Christian Schwab ◽  
David W. Coutts
Keyword(s):  
Noise Mitigation ◽  
Modal Noise

scholarly journals Modal noise mitigation for high-precision spectroscopy using a photonic reformatter

2020 ◽  
Vol 497 (3) ◽  
pp. 3713-3725
Author(s):  
F A Pike ◽  
A Benoît ◽  
D G MacLachlan ◽  
R J Harris ◽  
I Gris-Sánchez ◽  
...  
Keyword(s):  
Near Infrared ◽  
Broad Band ◽  
Single Mode ◽  
M Dwarfs ◽  
Noise Mitigation ◽  
Excitation Light ◽  
Single Mode Fibre ◽  
Spread Function ◽  
Potential Applications ◽  
Modal Noise

ABSTRACT Recently, we demonstrated how an astrophotonic light reformatting device, based on a multicore fibre photonic lantern and a 3D waveguide component, can be used to efficiently reformat the point spread function of a telescope to a diffraction-limited pseudo-slit. Here, we demonstrate how such a device can also efficiently mitigate modal noise – a potential source of instability in high-resolution multimode fibre-fed spectrographs. To investigate the modal noise performance of the photonic reformatter, we have used it to feed light into a bench-top near-infrared spectrograph (R ≈ 7000, λ ≈ 1550 nm). One approach to quantifying the modal noise involved the use of broad-band excitation light and a statistical analysis of how the overall measured spectrum was affected by variations in the input coupling conditions. This approach indicated that the photonic reformatter could reduce modal noise by a factor of 6 when compared to a multimode fibre with a similar number of guided modes. Another approach to quantifying the modal noise involved the use of multiple spectrally narrow lines, and an analysis of how the measured barycentres of these lines were affected by variations in the input coupling. Using this approach, the photonic reformatter was observed to suppress modal noise to the level necessary to obtain spectra with stability close to that observed when using a single mode fibre feed. These results demonstrate the potential of using photonic reformatters to enable efficient multimode spectrographs that operate at the diffraction-limit and are free of modal noise, with potential applications including radial velocity measurements of M-dwarfs.

scholarly journals Modal Noise Mitigation through Fiber Agitation for Fiber-fed Radial Velocity Spectrographs

2018 ◽  
Vol 853 (2) ◽  
pp. 181 ◽  
Author(s):  
Ryan R. Petersburg ◽  
Tyler M. McCracken ◽  
Dominic Eggerman ◽  
Colby A. Jurgenson ◽  
David Sawyer ◽  
...  
Keyword(s):  
Radial Velocity ◽  
Noise Mitigation ◽  
Modal Noise

scholarly journals Fiber modal noise mitigation by a rotating double scrambler

2020 ◽  
Author(s):  
Gert Raskin ◽  
Dmytro Rogozin ◽  
Tom Mladenov ◽  
Christian Schwab ◽  
David W. Coutts
Keyword(s):  
Noise Mitigation ◽  
Modal Noise

Surface Brightness Scale of Galactic Cepheids

1999 ◽  
Vol 190 ◽  
pp. 561-562
Author(s):  
G. P. Di Benedetto
Keyword(s):  
Surface Brightness ◽  
Variable Stars ◽  
Giant Stars ◽  
Near Ir

An accurate calibration of the surface brightness scaleSVas a function of the near-IR color (V–K) has been recently measured for non-variable Galactic dwarf and giant stars. It can be shown that this correlation can be applied to theSVscale of Galactic Cepheid variable stars, which are of major cosmological interest.

Plasmon-assisted interaction of Si with light, for cancer hyperthermia and electromagnetic energy harvest

2020 ◽  
Vol 92 (2) ◽  
pp. 20101
Author(s):  
Behnam Kheyraddini Mousavi ◽  
Morteza Rezaei Talarposhti ◽  
Farshid Karbassian ◽  
Arash Kheyraddini Mousavi
Keyword(s):  
Silicon Nanowires ◽  
Metallic Nanoparticles ◽  
Near Infrared ◽  
Optical Transition ◽  
Electromagnetic Energy ◽  
Energy Harvest ◽  
Absorption Enhancement ◽  
Ir Absorption ◽  
Absorption Mechanism ◽  
Near Ir

Metal-assisted chemical etching (MACE) is applied for fabrication of silicon nanowires (SiNWs). We have shown the effect of amorphous sheath of SiNWs by treating the nanowires with SF6 and the resulting reduction of absorption bandwidth, i.e. making SiNWs semi-transparent in near-infrared (IR). For the first time, by treating the fabricated SiNWs with copper containing HF∕H2O2∕H2O solution, we have generated crystalline nanowires with broader light absorption spectrum, up to λ = 1 μm. Both the absorption and photo-luminescence (PL) of the SiNWs are observed from visible to IR wavelengths. It is found that the SiNWs have PL at visible and near Infrared wavelengths, which may infer presence of mechanisms such as forbidden gap transitions other can involvement of plasmonic resonances. Non-radiative recombination of excitons is one of the reasons behind absorption of SiNWs. Also, on the dielectric metal interface, the absorption mechanism can be due to plasmonic dissipation or plasmon-assisted generation of excitons in the indirect band-gap material. Comparison between nanowires with and without metallic nanoparticles has revealed the effect of nanoparticles on absorption enhancement. The broader near IR absorption, paves the way for applications like hyperthermia of cancer while the optical transition in near IR also facilitates harvesting electromagnetic energy at a broad spectrum from visible to IR.

NEAR IR FARADAY ROTATION ON YIG DOPED WITH TETRAVALENT AND PENTAVALENT ELEMENTS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-969-C8-970 ◽  
Author(s):  
F. D'Orazio ◽  
F. Giammaria ◽  
F. Lucari ◽  
G. Parone
Keyword(s):  
Faraday Rotation ◽  
Near Ir
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