Combining freeform optics and curved detectors for wide field imaging: a polynomial approach over squared aperture

Muslimov, Eduard; Hugot, Emmanuel; Jahn, Wilfried; Vivès, S.; Fabert, Marc; Chambion, Bertrand; Henry, David D.; Gaschet, Cristophe

doi:10.1364/oe.25.014598

Cited by 48 publications

(24 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To facilitate the further explanations we provide sag diagrams for the 4 th to 11 th modes of each set on Figure 1 (the piston, tip and tilt are the same, so they are excluded). It is necessary to mention that a freeform surface can be described by any of these polynomial sets, but due to some features of the numerical optimization process one way of the freeform description can be preferable [20].…”

Section: Freeform Descriptionmentioning

confidence: 99%

See 1 more Smart Citation

Design and modeling of spectrographs with holographic gratings on freeform surfaces

et al. 2018

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Freeform Descriptionmentioning

confidence: 99%

“…Optical design of the POLLUX instrument MUV channel: (a) general view, (b) zoom-in of the polarimetric unit.tended UV region 90-390 nm[20]. Such a high resolution can be achieved in an instrument with 3 channels, when each of them represents an echelle spectrograph.…”

mentioning

confidence: 99%

Design and modeling of spectrographs with holographic gratings on freeform surfaces

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…In order to design the ideal survey for this type of observations, one would choose: a place with the lowest skybackground level; a telescope without obscuration, as any obscuration or spider causes diffraction and displace more power in the point spread function (PSF) towards the wings (Singaravelu & Cabanac 2014;Hugot et al 2014;Muslimov et al 2017a); a fast optical system with a small f /D (where f is the focal length and D is the diameter of the entrance pupil), as for extended objects the imaging speed depends on the focal ratio (not on the aperture size, as for point-source objects); it should have either only refractive elements with anti-reflection coatings (e.g. Abraham & van Dokkum 2014), or superpolished reflective surfaces, and no dust contamination.…”

Section: Introductionmentioning

confidence: 99%

Next-generation telescopes with curved focal surface for ultralow surface brightness surveys

Lombardo

Muslimov

Lemaitre

et al. 2019

Monthly Notices of the Royal Astronomical Society

Self Cite

View full text Add to dashboard Cite

In spite of major advances in both ground-and space-based instrumentation, the ultra-low-surface brightness universe (ULSB) still remains a largely unexplored volume in observational parameter space. ULSB observations provide unique constraints on a wide variety of objects, from the Zodiacal light all the way to the optical cosmological background radiation, through dust cirri, mass loss shells in giant stars, LSB galaxies and the intracluster light. These surface brightness levels (>28-29 mag arcsec −2 ) are observed by maximising the efficiency of the surveys and minimising or removing the systematics arising in the measurement of surface brightness. Based on full-system photon Monte Carlo simulations, we present here the performance of a ground-based telescope aimed at carrying out ULSB observations, with a curved focal surface design. Its off-axis optical design maximises the field of view while minimising the focal ratio. No lenses are used, as their multiple internal scatterings increase the wings of the point spread function (PSF), and the usual requirement of a flat focal plane is relaxed through the use of curved CCD detectors. The telescope has only one unavoidable single refractive surface, the cryostat window, and yet it delivers a PSF with ultra-compact wings, which allows the detection, for a given exposure time, of surface brightness levels nearly three orders of magnitude fainter than any other current telescope.

show abstract

“…Recent studies by Rim et al [1] and Stamenov et al [2] demonstrated a potential reduction of lenses, leading to compactness, better resolution and improved illumination with monocentric systems using a curved focal plane. Iwert et al and Muslimov et al [3,4] showed new ways to create telescopes and optical instruments with higher resolution for astronomical applications. Reshidko et al [5] demonstrated the possibility to create miniature lenses for mobile phone applications with faster apertures.…”

Section: Introductionmentioning

confidence: 99%

Methodology to design optical systems with curved sensors

et al. 2019

Self Cite

View full text Add to dashboard Cite

Curved sensors are a suitable technological solution to enhance the vast majority of optical systems. In this work, we show the entire process to create curved sensor-based optical systems and the possibilities they offer. This paper defines the boundaries of the reachable curvatures for a full range of monolithic sensors. We discuss how the curved focal plane shape is related to the imaged scenes and optical parameters. Two camera prototypes are designed, realized and tested, demonstrating a new compact optical architecture for a 40 degree compact objective, as well as a wide field fisheye zoom objective using a convex sensor to image a 180 degree field of view.

show abstract

Combining freeform optics and curved detectors for wide field imaging: a polynomial approach over squared aperture

Cited by 48 publications

References 34 publications

Design and modeling of spectrographs with holographic gratings on freeform surfaces

Design and modeling of spectrographs with holographic gratings on freeform surfaces

Next-generation telescopes with curved focal surface for ultralow surface brightness surveys

Methodology to design optical systems with curved sensors

Contact Info

Product

Resources

About