Visible Integral-field Replicable Unit Spectrograph (VIRUS) optical tolerance

Lee, Hanshin; Hill, Gary J.; Marshall, J. L.; Vattiat, Brian L.; DePoy, D. L.

doi:10.1117/12.857184

Cited by 18 publications

(6 citation statements)

References 14 publications

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“…We performed sensitivity analysis on each surface's tilt, decenter, despace, and root mean square (rms) error. The criterion of the sensitivity analysis is the 80% encircled energy diameter (EED) for the point source with 0. from the five fields are taken for overall performance variation to decide tolerance limits of Monte-Carlo simulation (Lee et al 2010). Figure 3 summarizes the sensitivity analysis results.…”

Section: Sensitivity Analysismentioning

confidence: 99%

Development of Linear Astigmatism Free—Three Mirror System (LAF-TMS)

Park

Chang

Lim

et al. 2020

PASP

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We present the development of Linear Astigmatism Free -Three Mirror System (LAF-TMS). This is a prototype of an off-axis telescope that enables very wide field of view (FoV) infrared satellites that can observe Paschen-α emission, zodiacal light, integrated star light, and other infrared sources. It has the entrance pupil diameter of 150 mm, the focal length of 500 mm, and the FoV of 5.5°× 4.1°. LAF-TMS is an obscuration-free off-axis system with minimal out-of-field baffling and no optical support structure diffraction. This optical design is analytically optimized to remove linear astigmatism and to reduce high-order aberrations. Sensitivity analysis and Monte-Carlo simulation reveal that tilt errors are the most sensitive alignment parameters that allow ∼1 . Optomechanical structure accurately mounts aluminum mirrors, and withstands satellite-level vibration environments. LAF-TMS shows arXiv:2002.05361v1 [astro-ph.IM] 13 Feb 2020 Development of LAF-TMS 2 optical performance with 37 µm FWHM of the point source image satisfying Nyquist sampling requirements for typical 18 µm pixel Infrared array detectors. The surface figure errors of mirrors and scattered light from the tertiary mirror with 4.9 nm surface micro roughness may affect the measured point spread function (PSF). Optical tests successfully demonstrate constant optical performance over wide FoV, indicating that LAF-TMS suppresses linear astigmatism and high-order aberrations.

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Section: Sensitivity Analysismentioning

confidence: 99%

Development of Linear Astigmatism Free—Three Mirror System (LAF-TMS)

Park

Chang

Lim

et al. 2020

PASP

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“…However, the design tools developed for Pollux can generalized and applied for other optical systems. Here as an example we consider a spectrograph with transmission freeform grating similar to the VIRUS instrument design 16 . The considered design works in the visible domain 350-550 nm with F/3.1 aperture.…”

Section: Optical Design With a Transmission Grating 41 Design Descrip...mentioning

confidence: 99%

Spectrographs with holographic gratings on freeform surfaces: design approach and application for the LUVOIR mission

Muslimov

Fabert

Hugot

et al. 2018

Optical Design and Engineering VII

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In the present paper we demonstrate the approach to use a holographic grating on a freeform surface for advanced spectrographs design. On the example POLLUX spectropolarimeter medium-UV channel we chow that such a grating can operate as a cross-disperser and a camera mirror at the same time. It provides the image quality high enough to reach the spectral resolving power of 126 359-133 106 between 11.5 and 195 nm, which is higher than the requirement. Also we show a possibility to use a similar element working in transmission to build an unobscured double-Schmidt spectrograph. The spectral resolving power reaches 2750 for a long slit. It is also shown that the parameters of both the gratings are feasible with the current technologies.

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“…The design and modelling tools developed for POLLUX can be generalized and applied to other optical systems. As an example we consider a spectrograph with a transmission freeform grating similar to the VIRUS instrument design [26]. The considered design works in the visible domain 350-550 nm with F/3.1 aperture.…”

Section: Optical Designmentioning

confidence: 99%

Design and modeling of spectrographs with holographic gratings on freeform surfaces

et al. 2018

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In the present paper we demonstrate the approach of using a holographic grating on a freeform surface for advanced spectrographs design. We discuss the surface and groove pattern description used for ray-tracing. Moreover, we present a general procedure of diffraction efficiency calculation, which accounts for the change of hologram recording and operation conditions across the surface. The primary application of this approach is the optical design of the POLLUX spectropolarimeter for the LUVOR mission project where a freeform holographic grating operates simultaneously as a cross-disperser and a camera with high resolution and high dispersion. The medium ultraviolet channel design of POLLUX is considered in detail as an example. Its resolving power reaches [126,000] in the region of 118.5-195 nm. Also, we show a possibility to use a similar element working in transmission to build an unobscured double-Schmidt spectrograph. The spectral resolving power reaches 4000 in the region 350-550 nm and remains stable along the slit.

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Visible Integral-field Replicable Unit Spectrograph (VIRUS) optical tolerance

Cited by 18 publications

References 14 publications

Development of Linear Astigmatism Free—Three Mirror System (LAF-TMS)

Development of Linear Astigmatism Free—Three Mirror System (LAF-TMS)

Spectrographs with holographic gratings on freeform surfaces: design approach and application for the LUVOIR mission

Design and modeling of spectrographs with holographic gratings on freeform surfaces

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