The PEPSIOS Purely Interferometric High-Resolution Scanning Spectrometer I The Pilot Model

Mack, J. E.; McNutt, D. P.; Roesler, F. L.; Chabbal, R.

doi:10.1364/ao.2.000873

Cited by 149 publications

(20 citation statements)

References 17 publications

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“…While this produces a best average correspondence between the two transmission profiles, the different spacing fluctuations in individual elemental areas traversed by a beam illuminating the two interferometers will result in relative shifts in the FPI transmission profiles. The situation is equivalent to a local detuning, which produces a broadening of the resulting transparency profile and a loss of the overall transmittance (Paper I) and has been named mutual masking (Mack et al 1963).…”

Section: Ibis Instrumental Profile At 6328 åmentioning

confidence: 99%

Characterization of Fabry-Perot interferometers and multi-etalon transmission profiles

Reardon¹,

Cavallini²

2008

A&A

115

109

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Aims. Properly characterizing Fabry-Perot interferometers (FPI) is essential for determining their effective properties and evaluating the performance of the astronomical instruments in which they are employed. Furthermore, in two-dimensional spectrographs where multiple FPI are used in series, the actual distribution of plate separation errors will be crucial for determining the resulting transmission profiles. We describe techniques that address these issues utilizing the FPI of IBIS, a solar bidimensional spectrometer installed at the Dunn Solar Telescope. Methods. A frequency-stabilized He-Ne laser was used in three different optical layouts to measure the spatially-resolved transmission of the FPI. Analyzing the shape and wavelength shift of the observed profiles allows the characteristics of the cavity errors and the interferometer coating to be determined. Results. We have measured the spatial distribution of the large-scale plate defects, which shows a steep radial trend, as well as the magnitude of the small-scale microroughness. We also extracted the effective reflectivity and absorption of the coating at the laser line wavelength for both interferometers. Conclusions. These techniques, which are generally applicable to any Fabry-Perot interferometer, provide the necessary information for calculating the overall instrumental profile for any illuminated area of the interferometer plates. Accurate knowledge of the spectral transmission profile is important, in particular when using inversion techniques or in comparing observations with simulated data.

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Section: Ibis Instrumental Profile At 6328 åmentioning

confidence: 99%

Characterization of Fabry-Perot interferometers and multi-etalon transmission profiles

Reardon¹,

Cavallini²

2008

A&A

115

109

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“…The total ghost intensity from an infinte number of reflections can then be written as, using that x + x 2 + x 3 + ... = x/(1 − x) (Mack et al 1963),…”

Section: Performance Criteriamentioning

confidence: 99%

Comments on the optimization of high resolution Fabry-Pérot filtergraphs

Scharmer¹

2006

A&A

161

141

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In this paper we present results of simulations of Fabry-Pérot (FPI) system performance that address two entirely separate aspects. The first concerns the image quality of FPIs used in telecentric optical setups. We show that the image degradation from phase errors found by von der Lühe & Kentischer (2000, A&AS, 146, 499) can largely be compensated by refocusing and that the major cause of image degradation is the pupil apodization discussed by Beckers (1998, A&AS, 120, 191). We also discuss the optimization of FPI systems, considering the effects of cavity errors on the homogeneity of the instrument function (transmission profile) across the FOV when two FPIs are combined in a telecentric reimaging system. Our conclusions from several numerical experiments are that telecentric FPI systems that use two or more FPIs with high (94-95%) reflectivities are likely to show large variations in the instrument profile across the FOV unless the cavity errors are significantly smaller than 2.0 nm. We show, that such homogeneity can be obtained at relatively low "cost" in terms of increased parasitic light levels by lowering the reflectivity of the FPI with the smallest cavity separation rather then lowering the reflectivity of both FPIs. We also demonstrate that the choice of cavity ratios has a strong impact on the homogeneity of the spectral transmission profile across the FOV and that double FPI systems with cavity ratios around 0.3 perform much better than at around 0.6.

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“…However photomultiplier tubes reached a peak quantum efficiency of 20% in the blue. This was of most use in studying point sources at high resolution, for example the study of interstellar absorption lines in the spectra of bright stars (Mack et al, 1963, Hicks at al, 1975. In this case it was necessary to scan the FP either by tilting it or by changing its spacing, or by changing the index of refraction.…”

Section: Scanning Fabry-perotsmentioning

confidence: 99%

“…Pressure scanning was popular for about 20 years, from the mid 50's to the mid 70's, and some pressure scanned systems are still in use today, most notably the highly productive PEPSIOS system (Mack et al 1963;Roesler et al, 1974). Changing the index p. by changing the air pressure is fairly straightforward.…”

Section: 1mentioning

confidence: 99%