Design of an Integral Field Unit for MUSE, and Results from Prototyping

Laurent, Florence; Hénault, François; Renault, Edgard; Bacon, Roland; Dubois, Jean‐Pierre

doi:10.1086/509125

Cited by 24 publications

(20 citation statements)

References 15 publications

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“…In fact the use of such optical components has already been popularized by the success of integral field spectroscopy, and has become common in ground telescope instrumentation: their manufacturing, aligning and testing processes are nowadays well mastered [34][35]. Moreover, it seems that the technique is now mature for space operation.…”

Section: Conventional Opticsmentioning

confidence: 99%

Phase-shifting technique for improving the imaging capacity of sparse-aperture optical interferometers

Hénault¹

2011

Appl. Opt.

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In this paper, we describe the principle of a multi-aperture interferometer that uses a phase-shifting technique and is suitable for quick, snapshot imaging of astrophysical objects at extreme angular resolution through Fourier inversion. A few advantages of the proposed design are highlighted, among which are radiometric efficiency, Field of View equivalent to those of Fizeau interferometers, and a preliminary calibration procedure allowing characterization of instrumental errors. For large telescope numbers, the proposed design also results in considerable simplification of the optical and mechanical design. Numerical simulations suggest that it should be possible to couple hundreds of telescopes on a single 4K x 4K detector array, using only conventional optical components or emerging technologies.

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Section: Conventional Opticsmentioning

confidence: 99%

Phase-shifting technique for improving the imaging capacity of sparse-aperture optical interferometers

Hénault¹

2011

Appl. Opt.

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“…), astronomical ISS systems have relatively low spatial sampling (typically less than 60 image slices) [30]. No current astronomical ISS system can be simply modified and adapted for the demanding requirements of biological fluorescence microscopy.…”

Section: Introductionmentioning

confidence: 99%

Compact Image Slicing Spectrometer (ISS) for hyperspectral fluorescence microscopy

2009

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An image slicing spectrometer (ISS) for microscopy applications is presented. Its principle is based on the redirecting of image zones by specially organized thin mirrors within a custom fabricated component termed an image slicer. The demonstrated prototype can simultaneously acquire a 140nm spectral range within its 2D field of view from a single image. The spectral resolution of the system is 5.6nm. The FOV and spatial resolution of the ISS depend on the selected microscope objective and for the results presented is 45×45μm 2 and 0.45μm respectively. This proof-of-concept system can be easily improved in the future for higher (both spectral and spatial) resolution imaging. The system requires no scanning and minimal post data processing. In addition, the reflective nature of the image slicer and use of prisms for spectral dispersion make the system light efficient. Both of the above features are highly valuable for real time fluorescent-spectral imaging in biological and diagnostic applications.

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“…Each IFU is composed of an original advanced image slicer associated with a high-throughput spectrograph with a Volume Phase Holographic Grating (VPGH) and a 4k×4k CCD detector. Although different experiments have been carried out on image slicer system ( [5], [6], [7] and [8]), MUSE IFU represents a major challenge for MUSE. The Figure 1 gives a mechanical overview of MUSE with all subsystems.…”

Section: Introductionmentioning

confidence: 99%

MUSE integral field unit: test results on the first out of 24

et al. 2010

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MUSE (Multi Unit Spectroscopic Explorer) is a second generation VLT panoramic integral field spectrograph developed for the European Southern Observatory (ESO), operating in the visible wavelength range (0.465-0.93 μm). It is composed of 24 identical Integral Field Units (IFU); each one incorporates an advanced image slicer associated with a classical spectrograph and a detector vessel. The Image Slicer subsystem -ISS-is composed of two mirror arrays of 48 spherical elements each. It is made of Zerodur and uses an innovative polishing approach where all individual components are polished together by classical method. The MUSE Spectrograph -SPS-, with fast output focal ratio of f/1.95, implements a Volume Phase Holographic Grating -VPHG. The last subsystem, the Detector Vessel -DVincludes a chip of 4k by 4k 15µm pixels supported by a Vacuum and Cryogenic System -VCS -provided by ESO. The first out of 24 IFUs for MUSE instrument has been manufactured, aligned and tested last months. First, this paper describes the optical design, the manufacturing and test results (image quality, pupil and field of view positioning) of each subsystem independently. Second, we will focus on overall system performance (image quality and positioning) of the spectrograph associated with the detector vessel. At the end, the test results (image quality, positioning, throughput, mechanical interfaces) of the first IFU for MUSE instrument will be reported. Most of them are compliant with requirements that it demonstrates that the manufacturing, integration, alignment and tests processes are mature and gives good confidence for serial production by 24 times applied to MUSE instrument.

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Design of an Integral Field Unit for MUSE, and Results from Prototyping

Cited by 24 publications

References 15 publications

Phase-shifting technique for improving the imaging capacity of sparse-aperture optical interferometers

Phase-shifting technique for improving the imaging capacity of sparse-aperture optical interferometers

Compact Image Slicing Spectrometer (ISS) for hyperspectral fluorescence microscopy

MUSE integral field unit: test results on the first out of 24

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