FISICA: the Florida image slicer for infrared cosmology and astrophysics

Eikenberry, S. S.; Elston, R.; Guzmán, R.; Julian, Jeff; Raines, S. N.; Gruel, N.; Boreman, Glenn D.; Glenn, Paul; Hull-Allen, C. G.; Hoffman, Jeff; Rodgers, Michael; Thompson, Kevin P.; Flint, Scott; Comstock, Lovell E.; Myrick, Bruce

doi:10.1117/12.549150

Cited by 13 publications

(5 citation statements)

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“…One of the other techniques for building IFUs is to use slicing optics. Advanced image slicers [46][47][48] use powered optics machined out of monolithic blocks of metal to geometrically rearrange a 2-dimensional field of view into a linear pseudo-slit, which is then be dispersed by a spectrograph. The lenslet IFU has significantly looser specifications on the spectrograph optics because a lenslet array destroys the spatial information otherwise preserved by the slicing optics, which would otherwise be forced by the spectrograph optics to preserve all the way to the detector.…”

Section: Slenslitmentioning

confidence: 99%

“…The bolt-and-go approach has been used with great success for a variety of instruments, from the small (FISICA/FLAMINGOS-1 46 to large facility-class instruments such as CIRCE, [59][60][61] FRIDA, 47 and MIRADAS, 48 all of which implement the bolt-and-go method to precisely locate many if not all of their diamond-turned mirrors. As described in the previous SCALES/PSI-Red SPIE paper, 56 the bolt-and-go approach is a semikinematic mounting scheme that puts much of the onus of alignment into the opto-mechanical design instead of during the alignment phase.…”

Section: Bolt-and-gomentioning

confidence: 99%

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Update on the Preliminary Design of SCALES: the Santa Cruz Array of Lenslets for Exoplanet Spectroscopy

Stelter¹,

Skemer²,

Sallum³

et al. 2020

Preprint

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SCALES (Santa Cruz Array of Lenslets for Exoplanet Spectroscopy) is a 2-5 micron high-contrast lenslet integralfield spectrograph (IFS) driven by exoplanet characterization science requirements and will operate at W. M. Keck Observatory. Its fully cryogenic optical train uses a custom silicon lenslet array, selectable coronagraphs, and dispersive prisms to carry out integral field spectroscopy over a 2.2 arcsec field of view at Keck with low (< 300) spectral resolution. A small, dedicated section of the lenslet array feeds an image slicer module that allows for medium spectral resolution (5000 − 10000), which has not been available at the diffraction limit with a coronagraphic instrument before. Unlike previous IFS exoplanet instruments, SCALES is capable of characterizing cold exoplanet and brown dwarf atmospheres (< 600 K) at bandpasses where these bodies emit most of their radiation while capturing relevant molecular spectral features.

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Section: Slenslitmentioning

confidence: 99%

Section: Bolt-and-gomentioning

confidence: 99%

Update on the Preliminary Design of SCALES: the Santa Cruz Array of Lenslets for Exoplanet Spectroscopy

Stelter¹,

Skemer²,

Sallum³

et al. 2020

Preprint

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“…This removes the onus of aligning some 84 mirrors in 14 separate arrays onto a single bench (note that this does not include the probe aft system with its additional 12 lens doublets and 48 mirrors!). Each mirror array is machined out of RSA-6061 aluminum, with the optics being plated with electroless nickel, diamond-turned, and then gold-coated (as in FISICA [6][7][8] and FRIDA 9,10 ). The optical mounts are also designed with precision location pinholes and bolt holes for mounting to the IFU bench.…”

Section: Radiusmentioning

confidence: 99%

Optical and Opto-Mechanical Design of a Novel "Macro" Image Slicer for the MIRADAS Instrument

Stelter,

Eikenberry

2019

Preprint

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We present the innovative macro-slicer optical and opto-mechanical designs for the third-generation Mid-resolution InfraReD Astronomical Spectrograph (MIRADAS) instrument for the 10.4m Gran Telescopio Canarias (GTC) in the 1-2.5 µm bandpass. MIRADAS uses up to 12 cryogenic, fully steerable probes to select simultaneous targets in a 5 arcminute field of view. The spectrograph module is a cross-dispersed echelle spectrograph. The macro-slicer is effectively a stack of six advanced image slicer Integral Field Units (IFUs) such as FRIDA or FISICA, and like other IFUs designed and built at the University of Florida by our group, uses a 'bolt-and-go' approach to minimize the difficulty in alignment and maximize robustness. Like other advanced image slicer IFUs, there are three sets of mirrors that work together to geometrically rearrange the loosely packed inputs from the probe arms into a tightly packed pseudo-slit. The macro-slicer also passively keeps the spectral resolution of MIRADAS fixed at R > 20, 000 in seeing from 1.2 arcseconds down to 0.4 arcseconds, (typical observing conditions at GTC).

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“…36 These, together with the MPE imaging spectrometer, 37 were the concepts developed in the XXth century. In the XXIst century, several advances were deployed in the field, in systems such as: SPIFFI 38 in the VLT SINFONI instrument, the Florida Image Slicer for Infrared Cosmology and Astrophysics (FISICA), 39 MIRADAS 40 for GTC telescope or the image slicers of KMOS 41 and MUSE, 42 the Multi Unit Spectroscopic Explorer. Most recently, innovative image slicer designs have been employed that control the symmetry to overlap all intermediate pupil images; 4 combine the elements of the IFU with those of the spectrograph 43 or offer a collimated output beam.…”

Section: Image Slicersmentioning

confidence: 99%

The reformatting advantage: photonics vs conventional optics!

Calcines

Harris

Haynes

et al. 2018

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III

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In recent decades, spectroscopic capabilities have been significantly enhanced by new technological developments, in particular spatial reformatting. Spatial reformatting allows multiple functionalities: the observation of a larger area of sky, obtaining the spectra of all spatial elements under the same atmospheric conditions; modification of the shape and size of the field of view; focal-ratio conversion for the optimized coupling between the telescope and the spectrograph; increase in the spatial and spectral resolving power; the observation of multiple objects; homogeneity in the illumination; scrambling of spatial and/or phase induced structure with the instrument, thus improving the system stability; relocation of the exit pupil, especially important for telecentric systems. The impact of reformatting and the breadth of science cases is so great that many alternative methods and technologies have been proposed: image slicers using refractive or reflective solutions; optical fibers with different core sizes and geometries; microlenses used in isolation or combined with fibers and more recently, photonic devices such as Photonic lanterns to produce modal decomposition. In this paper, a comparison between all currently available options is presented, with a detailed analysis of their advantages and limitations and a proposal for a new reformatter combining slicers and photonic devices. This proposal presents the advantages of the other alternatives and additionally offers: minimization of focal-ratio degradation; produces image and modal decomposition; improves the throughput along the spectral range, increases the spectral resolving power and adds the functionality of scrambling. All of these advantages are combined in a system where photonic and astronomical instrumentation capabilities are joined in an innovative solution with many applications, like for example, the Extremely Large Telescope.

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FISICA: the Florida image slicer for infrared cosmology and astrophysics

Cited by 13 publications

References 0 publications

Update on the Preliminary Design of SCALES: the Santa Cruz Array of Lenslets for Exoplanet Spectroscopy

Update on the Preliminary Design of SCALES: the Santa Cruz Array of Lenslets for Exoplanet Spectroscopy

Optical and Opto-Mechanical Design of a Novel "Macro" Image Slicer for the MIRADAS Instrument

The reformatting advantage: photonics vs conventional optics!

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