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    Abstract:
    KMOS is a near-infrared multi-object integral-field spectrometer which is one of a suite of second-generation instruments under construction for the VLT. The instrument is being built by a consortium of UK and German institutes working in partnership with ESO and is now in the manufacture, integration and test phase. In this paper we present an overview of recent progress with the design and build of KMOS and present the first results from the subsystem test and integration.
    Keywords:
    Integral field spectrograph
    A dedicated optimized spectrograph based on an integral field unit adopting an imager slicing concept has been developed for the SNAP (SuperNova/Acceleration Probe) experiment. A prototype for the SNAP application is undergoing test at Marseille (France) between LAM (INSU) and CPPM/IPNL(IN2P3) to provide the verification of the optical performances associated with the development of a complete simulation of the instrument. The goal of this demonstrator is to prove the optical and functional requirements of the SNAP spectrograph: diffraction losses, spectrophotometric calibration, image quality and straylight.
    Integral field spectrograph
    Citations (7)
    Abstract We presented the design for a fiber based integral field unit spectrograph for the new two meter class Wendelstein telescope in Bavaria, Germany. The proposed spectrograph will feature a fiberhead consisting of 246 individual optical fibers and a field of view of approximately 1′ × 2′ and two different spectral resolution modes optimized for the study of bulges of local late-type galaxies.
    Integral field spectrograph
    Spectral resolution
    Citations (0)
    One of the highest scientific priorities for the E-ELT is to characterise exoplanets and to image Earth-like planets with the dedicated planetary camera and spectrograph, ELT-PCS. Detailed design and construction of ELT-PCS requires R and D to be undertaken for specific components. In this paper we discuss plans to progress this R and D for the integral field spectrograph technology, with the aim of determining the best contrast achievable with both a lenslet and a slicer based spectrograph. In particular, we present the preliminary design for a new bench spectrograph capable of accepting either of the two competing technologies as its input.
    Integral field spectrograph
    Citations (0)
    An integral field spectrograph concept has been developed for the SNAP/JDEM(SuperNova/Acceleration Probe) experiment. This spectrograph will be optimized for faint supernovae and galaxies in a 3×6 arsec2 at low spectral resolution (R~100) through the wavelength range (0.35-1.7 μm). The integral field method is based on glass image slicer. A prototype of this instrument has been build to validate the concept and prove the optical and functional requirements of the SNAP spectrograph. In this paper, we present the first results of this demonstrator. We describe the demonstrator philosophy, set up and functional performances. We present then the first experimental results obtained in the visible range. We validate the slicer optical quality through a set of measurements: PSF, optical losses.
    Integral field spectrograph
    Spectral resolution
    Citations (4)
    Thirty Meter Telescope (TMT) will see its first light in 2018. We propose Second-Earth Imager for TMT (SEIT) as a possible next generation instrument of TMT. The main purpose of the SEIT is direct detection of habitable planets around M-type stars. The large aperture of the TMT allows us to directly image very faint planets close to the bright central stars. In general the ground-based telescopes will suffer from speckles caused by static aberrations and high sky background, which prevent us to directly detect reflective light from (super) Earths. Here, we propose a new concept for both speckle and sky background suppressions by the use of an interferometric technique. The exozodiacal light is also suppressed when it is a symmetric source. Thus, this concept suppresses symmetric sources and then enhances the contrast of the SITE. In this paper, we will show the concept of the SEIT and our preliminary simulation results.
    Aperture (computer memory)
    First light
    Citations (8)
    The Infra-Red Imaging Spectrograph (IRIS) is one of the three first light instruments for the Thirty Meter Telescope (TMT) and is the only one to directly sample the diffraction limit. The instrument consists of a parallel imager and off-axis Integral Field Spectrograph (IFS) for optimum use of the near infrared (0.84um-2.4um) Adaptive Optics corrected focal surface. We present an overview of the IRIS spectrograph that is designed to probe a range of scientific targets from the dynamics and morphology of high-z galaxies to studying the atmospheres and surfaces of solar system objects, the latter requiring a narrow field and high Strehl performance. The IRIS spectrograph is a hybrid system consisting of two state of the art IFS technologies providing four plate scales (4mas, 9mas, 25mas, 50mas spaxel sizes). We present the design of the unique hybrid system that combines the power of a lenslet spectrograph and image slicer spectrograph in a configuration where major hardware is shared. The result is a powerful yet economical solution to what would otherwise require two separate 30m-class instruments.
    Integral field spectrograph
    Strehl ratio
    IRIS (biosensor)
    Field of view
    Citations (6)
    HARMONI (High Angular Resolution MOnolithic Integral field spectrograph)1 is a planned first-light integral field spectrograph for the Extremely Large Telescope. The spectrograph sub-system is being designed, developed, and built by the University of Oxford. The project has just completed the Preliminary Design Review (PDR), with all major systems having nearly reached a final conceptual design. As part of the overall prototyping and assembly, integration, and testing (AIT) of the HARMONI spectrograph, we will be building a full-scale engineering model of the spectrograph. This will include all of the moving and mechanical systems, but without optics. Its main purpose is to confirm the AIT tasks before the availability of the optics, and the system will be tested at HARMONI cryogenic temperatures. By the time of the construction of the engineering model, all of the individual modules and mechanisms of the spectrograph will have been prototyped and cryogenically tested. The lessons learned from the engineering model will then be fed back into the overall design of the spectrograph modules ahead of their development.
    Integral field spectrograph
    Conceptual design
    Citations (0)
    We present the results of a design study for an integral field spectrograph as the "back-end" instrument for spectroscopy of exoplanets carried out in the context of the EPICS Phase A study. EPICS is the planet finder imager and spectrograph for the E-ELT. In our study we investigated the feasibility of an image slicer based integral field spectrograph and developed an optical design for the image slicer and the necessary pre-optics, as well as the spectrograph optics. We present a detailed analysis of the optical performance of the design.
    Integral field spectrograph
    Citations (1)
    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 and Near Infrared wavelength range (0.465-0.93 μm) with a 1 arcmin square FoV sampled at 0.2arcsec. It is composed of a Calibration unit, a Fore-optics and a Splitting and relay system that feeds 24 identical Integral Field Units (IFU); each one incorporates an advanced image slicer associated with a classical spectrograph. This article will present the optical design choices that have been done to optimize the costs, size and performances of the instrument as well as a detailed ghost images analysis of the whole instrument.
    Citations (4)