The visible tunable filtergraph for the ATST

Kentischer, T.; Schmidt, Wolfgang; Lühe, O. von der; Sigwarth, M.; Bell, Alexander Graham; Halbgewachs, C.; Fischer, Andreas

doi:10.1117/12.926789

Cited by 26 publications

(27 citation statements)

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“…However, a significant challenge for FP design in the era of large > 4 meter class solar telescopes is the required FP aperture. As discussed by Beckers (1998), von der Lühe and Kentischer (2000), and Kentischer et al (2012), the pupil apodization effect for FPs in a telecentric mounting configuration, which from the point of view of spatial resolution is preferred over the collimated mounting, introduces velocity errors that scale with the target contrast and the beam focal ratio incident of the FPs. Typical solar requirements for velocity errors (10s of m/sec) and field-of-view (∼> 50 ) consequently require very large FPs, i.e.…”

Section: Discussionmentioning

confidence: 99%

Infrared Imaging Spectroscopy Using Massively Multiplexed Slit-Based Techniques and Sub-Field Motion Correction

Schad

Lin

2017

Sol Phys

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Targeting dynamic spatially-extended phenomena in the upper solar atmosphere, a new instrument concept has been developed and tested at the Dunn Solar Telescope in New Mexico, USA, that provides wide-field, rapidscanning, high-resolution imaging spectroscopy of the neutral helium λ10830 spectral triplet. The instrument combines a narrowband imaging channel with a novel, co-spatial, 17 parallel-long-slit, grating-based spectrograph that are simultaneously imaged on a single HgCdTe detector. Over a 170 × 120 field of view, a temporal cadence of 8.5 seconds is achieved between successive maps that critically sample the diffraction limit of the Dunn Solar Telescope at 1083 nm (1.22λ/D = 0.36 ) and provide a resolving power (R = λ/δλ) up to ∼ 40000 with a 1 nm bandwidth (i.e., 275 km sec −1 Doppler coverage). Capitalizing on the strict simultaneity of the narrowband channel relative to each spectral image (acquired at a rate of 10 Hz), this work demonstrates that sub-field image motion introduced by atmospheric seeing may be compensated in each mapped spectral data cube. This instrument furnishes essential infrared spectral imaging capabilities for current investigations while pioneering techniques for high-resolution, wide-field, time-domain solar astronomy.

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Section: Discussionmentioning

confidence: 99%

Infrared Imaging Spectroscopy Using Massively Multiplexed Slit-Based Techniques and Sub-Field Motion Correction

Schad

Lin

2017

Sol Phys

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“…This type of instrument has been in use for almost two decades, e.g., the Göttingen Fabry-Pérot interferometer (Bendlin, Volkmer & Kneer 1992) and the Telecentric Etalon Solar Spectrometer (TESOS, Kentischer et al 1998) at the Vacuum Tower Telescope (VTT) on Tenerife, the Interferometric Bidimensional Spectrometer (IBIS, Cavallini 2006) at the Dunn Solar Telescope (DST) in New Mexico, and the visible-light and NIR imaging magnetographs (Denker et al 2003) Scharmer et al (2008).…”

Section: Introductionmentioning

confidence: 99%

Instrument and data analysis challenges for imaging spectropolarimetry

Denker

2010

Astron Nachr

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The next generation of solar telescopes will enable us to resolve the fundamental scales of the solar atmosphere, i.e., the pressure scale height and the photon mean free path. High-resolution observations of small-scale structures with sizes down to 50 km require complex post-focus instruments, which employ adaptive optics (AO) and benefit from advanced image restoration techniques. The GREGOR Fabry-Perot Interferometer (GFPI) will serve as an example of such an instrument to illustrate the challenges that are to be expected in instrumentation and data analysis with the next generation of solar telescopes.Comment: 4 pages, 1 figure, accepted for publication in Astronomische Nachrichten/AN, special issue of the 1st EAST-ATST Workshop: "Science with large solar telescopes" in Freiburg, Germany, October 14-16, 200

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“…At the Udaipur Solar Observatory (USO), a narrow-band imaging system (imager) has been developed using two LN etalons in tandem with an appropriate thickness ratio. Using the etalons in tandem effectively increases the free spectral range (FSR) and the spectral resolution of the system (Kentischer et al, 1998;Tritschler et al, 2002). Although inter-reflections between multi-etalons cause ghost images, these can be eliminated or minimized either by tilting the etalons with respect to each other, or by placing a prefilter in between the etalons or by both (Tritschler et al, 2002;Kleint, Feller and Gisler, 2011;Martínez Pillet et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Narrow-Band Imaging System for the Multi-application Solar Telescope at Udaipur Solar Observatory: Characterization of Lithium Niobate Etalons

et al. 2014

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Multi-application Solar Telescope is a 50 cm off-axis Gregorian telescope that has been installed at the lake site of Udaipur Solar Observatory. For quasi-simultaneous photospheric and chromospheric observations, a narrow-band imager has been developed as one of the back-end instruments for this telescope. Narrow-band imaging is achieved using two lithium niobate Fabry-Perot etalons working in tandem as a filter. This filter can be tuned to different wavelengths by changing either voltage, tilt or temperature of the etalons. To characterize the etalons, a Littrow spectrograph was set up, in conjunction with a 15 cm Carl Zeiss Coudé solar telescope. The etalons were calibrated for the solar spectral lines Fe i 6173Å, and Ca ii 8542Å. In this work, we discuss the characterization of the Fabry-Perot etalons, specifically the temperature and voltage tuning of the system for the spectral lines proposed for observations. We present the details of the calibration set-up and various tuning parameters. We also present solar images obtained using the system.

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The visible tunable filtergraph for the ATST

Cited by 26 publications

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Infrared Imaging Spectroscopy Using Massively Multiplexed Slit-Based Techniques and Sub-Field Motion Correction

Infrared Imaging Spectroscopy Using Massively Multiplexed Slit-Based Techniques and Sub-Field Motion Correction

Instrument and data analysis challenges for imaging spectropolarimetry

Narrow-Band Imaging System for the Multi-application Solar Telescope at Udaipur Solar Observatory: Characterization of Lithium Niobate Etalons

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