Optical fibers in astronomical instruments

Heacox, William D.; Connes, P.

doi:10.1007/bf00872526

Cited by 18 publications

(10 citation statements)

References 18 publications

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“…A review of fibers in astronomy has been given by Heacox & Connes (1992). Fiber-fed spectrographs use multi-mode stepindex fibers with core sizes typically in the 50-to 500-µm range.…”

Section: Scrambling Properties Of Fibers Used For Echelle Spectrographmentioning

confidence: 99%

SOPHIE+: First results of an octagonal-section fiber for high-precision radial velocity measurements

Bouchy

Díaz

Hébrard

et al. 2012

A&A

135

144

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High-precision spectrographs play a key role in exoplanet searches and Doppler asteroseismology using the radial velocity technique. The 1 m s −1 level of precision requires very high stability and uniformity of the illumination of the spectrograph. In fiber-fed spectrographs such as SOPHIE, the fiber-link scrambling properties are one of the main conditions for high precision. To significantly improve the radial velocity precision of the SOPHIE spectrograph, which was limited to 5-6 m s −1 , we implemented a piece of octagonal-section fiber in the fiber link. We present here the scientific validation of the upgrade of this instrument, demonstrating a real improvement. The upgraded instrument, renamed SOPHIE+, reaches radial velocity precision in the range of 1-2 m s −1 . It is now fully efficient for the detection of low-mass exoplanets down to 5-10 M ⊕ and for the identification of acoustic modes down to a few tens of cm s −1 .

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“…A review of fibers in astronomy has been given by Heacox & Connes (1992). Fiber-fed spectrographs use multi-mode stepindex fibers with core sizes typically in the 50-to 500-µm range.…”

Section: Scrambling Properties Of Fibers Used For Echelle Spectrographmentioning

confidence: 99%

SOPHIE+: First results of an octagonal-section fiber for high-precision radial velocity measurements

Bouchy

Díaz

Hébrard

et al. 2012

A&A

135

144

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“…Cross-dispersion of the dispersed beam enables higher spectral resolution and longer slits in compact instruments (e.g., Allington-Smith et al 1989;Tull et al 1995;Smith et al 1998;McLean et al 1998;Wilson et al 2001). The use of multiple slits or fibers makes it possible to obtain spectra for hundreds of objects simultaneously over wide fields (e.g., Heacox & Connes 1992;York et al 2000;Colless et al 2001;Le Fèvre et al 2001;Hook et al 2003). Integral field spectroscopy of moderately wide areas using image slicing, densely packed fiber bundles, or microlens arrays efficiently maps extended objects (e.g., Tecza et al 1998;Content 1998;Mandel et al 2000;Dubbeldam et al 2000;Bacon et al 2001;Poglitsch et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Spectral Mapping Reconstruction of Extended Sources

Smith¹,

Armus²,

Dale³

et al. 2007

PUBL ASTRON SOC PAC

244

203

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ABSTRACT. Three-dimensional spectroscopy of extended sources is typically performed with dedicated integral field spectrographs. We describe a method of reconstructing full spectral cubes, with two spatial and one spectral dimension, from rastered spectral mapping observations employing a single slit in a traditional slit spectrograph. When the background and image characteristics are stable, as is often achieved in space, the use of traditional long slits for integral field spectroscopy can substantially reduce instrument complexity over dedicated integral field designs, without loss of mapping efficiency-particularly compelling when a long-slit mode for single unresolved source follow-up is separately required. We detail a custom flux-conserving cube reconstruction algorithm, discuss issues of extended-source flux calibration, and describe CUBISM, a tool that implements these methods for spectral maps obtained with the Spitzer Space Telescope's Infrared Spectrograph.

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“…Optical fibers provide an excellent way to reduce variability in the illumination of the spectrograph. Fibers have been used since the 1980's to couple telescopes to high-precision spectrographs (Heacox & Connes 1992). The throughput of fibers was initially low, however, they offered unprecedented convenience in mechanical design.…”

Section: Introductionmentioning

confidence: 99%

Fiber Scrambling for High-Resolution Spectrographs. I. Lick Observatory

Spronck

Fischer

Kaplan

et al. 2013

Publications of the Astronomical Society of the Pacific

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In this paper, we report all results obtained with a fiber scrambler on the Hamilton spectrograph at Lick Observatory. We demonstrate an improvement in the stability of the instrumental profile using this fiber scrambler. Additionally, we present data obtained with a double scrambler that further improves the stability of the instrument by a factor 2. These results show that errors related to the coupling between the telescope and the spectrograph are the dominant source of instrumental profile variability at Lick Observatory. In particular, we show a strong correlation between instrumental profile variations and hour angle, most likely due to pointing-dependent illumination of the spectrograph optics.

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Optical fibers in astronomical instruments

Cited by 18 publications

References 18 publications

SOPHIE+: First results of an octagonal-section fiber for high-precision radial velocity measurements

SOPHIE+: First results of an octagonal-section fiber for high-precision radial velocity measurements

Spectral Mapping Reconstruction of Extended Sources

Fiber Scrambling for High-Resolution Spectrographs. I. Lick Observatory

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