Moderate-resolution holographic spectrograph

Muslimov, Eduard; Pavlycheva, N. K.; Valyavin, G. G.; Fabrika, S.

doi:10.1134/s1990341316030093

Cited by 7 publications

(9 citation statements)

References 23 publications

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“…The lines in a spectral image can be separated by rotating the gratings in the sagittal plane. The first version of such an optical scheme was proposed by Muslimov et al (2016a), although a similar concept can be traced back to Battey et al (1995).…”

Section: Concept Of the Instrument And Optical Designmentioning

confidence: 99%

“…For several research areas in modern astrophysics, it would be desirable to have an instrument occupying an intermediate position between the two above-mentioned groups in the resolution-throughput space. The authors had considered a possibility of building such a spectrograph on the basis of a cascade of volume-phase holographic (VPH) gratings (Muslimov et al 2016a). As explained below, such a spectrograph combines the high efficiency of VPHs with an improved spectral resolution over an extended spectral range, which becomes possible due to the registration of multiple spectral images at the same detector simultaneously.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of an Advanced Concept of Moderate-resolution Holographic Spectrographs

Muslimov¹,

Valyavin²,

Fabrika³

et al. 2018

PASP

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We present the results of an experimental study of an advanced moderateresolution spectrograph based on a cascade of narrow-band holographic gratings. The main goal of the project is to achieve a moderately high spectral resolution with R up to 5000 simultaneously in the 4300-6800Å visible spectral range on a single standard CCD, together with an increased throughput. The experimental study consisted of (1) resolution and image quality tests performed using the solar spectrum; and (2) a total throughput test performed for a number of wavelengths using a calibrated lab monochromator. The measured spectral resolving power reaches values over R>4000 while the experimental throughput is as high as 55%, which is in good agreement with the modeling results. Comparing the obtained characteristics of the spectrograph under consideration with the best existing spectrographs, we conclude that the used concept can be considered a very competitive and cheap alternative to the existing spectrographs of the given class. We propose several astrophysical applications for the instrument and discuss the prospect of creating its full-scale version.

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Section: Concept Of the Instrument And Optical Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study of an Advanced Concept of Moderate-resolution Holographic Spectrographs

Muslimov¹,

Valyavin²,

Fabrika³

et al. 2018

PASP

View full text Add to dashboard Cite

show abstract

“…We should emphasize that the first three steps were considered in our previous studies [6,7] and here they serve as a starting point for further optimization and modelling.…”

Section: Modelling Strategymentioning

confidence: 99%

“…On the previous stages of the researches we developed two versions of such spectrograph for the visible domain 430-680 nm [6,7]. It was demonstrated that the spectral resolution of the full-size scheme is 0.082-0.124 nm, i.e.…”

Section: Introductionmentioning

confidence: 99%

Advanced modeling of a moderate-resolution holographic spectrograph

et al. 2017

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In the present article we consider an accurate modeling of spectrograph with cascade of volume-phase holographic gratings. The proposed optical scheme allows to detect spectra in an extended wavelength range without gaps providing relatively high spectral resolution and high throughput. However, modeling and minimization of possible cross-talks between gratings and stray light in such a scheme represents a separate task. We use analytical equations of coupled wave theory together with rigorous coupled wave analysis to optimize the gratings parameters and further apply the latter together with non-sequential raytracing algorithm to model propagation of beams through the spectrograph. The results show relatively high throughput up to 53% and absence of any significant cross-talks or ghost images even for ordinary holograms recorded on dichromated gelatin.

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“…If a few of such gratings are mounted one after another with proper inclination angles in both of tangential and sagittal planes, it appears to be possible to form a spectral image consisting of several lines and characterized by a relatively high dispersion and high illuminance. Two versions of such a spectrograph were considered by the authors before 2,3 .…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of a dispersive unit based on cascaded volume phase holographic gratings

et al. 2017

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We describe a dispersive unit consisting of cascaded volume-phase holographic gratings for spectroscopic applications. Each of the gratings provides high diffractive efficiency in a relatively narrow wavelength range and transmits the rest of the radiation to the 0 th order of diffraction. The spectral lines formed by different gratings are centered in the longitudal direction and separated in the transverse direction due to tilt of the gratings around two axes. We consider a technique of design and optimization of such a scheme. It allows to define modulation of index of refraction and thickness of the holographic layer for each of the gratings as well as their fringes frequencies and inclination angles. At the first stage the gratings parameters are found approximately using analytical expressions of Kogelnik's coupled wave theory. Then each of the grating starting from the longwave sub-range is optimized separately by using of numerical optimization procedure and rigorous coupled wave analysis to achieve a high diffraction efficiency profile with a steep shortwave edge. In parallel such targets as ray aiming and linear dispersion maintenance are controlled by means of ray tracing. We demonstrate this technique on example of a small-sized spectrograph for astronomical applications. It works in the range of 500-650 nm and uses three gratings covering 50 nm each. It has spectral resolution of 6130-12548.Obtaining of the asymmetrical efficiency curve is shown with use of dichromated gelatin and a photopolymer. Change of the curve shape allows to increase filling coefficient for the target sub-range up to 2.3 times.

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Moderate-resolution holographic spectrograph

Cited by 7 publications

References 23 publications

Experimental Study of an Advanced Concept of Moderate-resolution Holographic Spectrographs

Experimental Study of an Advanced Concept of Moderate-resolution Holographic Spectrographs

Advanced modeling of a moderate-resolution holographic spectrograph

Design and optimization of a dispersive unit based on cascaded volume phase holographic gratings

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