Propriétés chromatiques des couches réfléchissantes multi-diélectriques

Giacomo, P.

doi:10.1051/jphysrad:01958001903030700

Cited by 16 publications

(11 citation statements)

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“…If the absolute value of the phase shift is not constant over the aperture, it has the same effect as nonflatness of the support plate. If the dispersion of phase shift is not constant, then the shape of the reflected wavefront will depend on the wavelength [ 37 ]. In particular, if two such mirrors are adjusted to be optically parallel when a green line is used, they may not be optically parallel in the red or blue.…”

Section: Resultsmentioning

confidence: 99%

Phase shift effects in Fabry-Perot interferometry

Koester¹

1960

J. RES. NATL. BUR. STAN. SECT. A.

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A m ethod is d erno nst rated fo r ut ili~in g in Fabry-P erot in tC I·fero ln et r. ,· t he data o n r efl ectio n p hase shif t d isper sion obtain ed from f rin ges of eq ual chromati c o rd er . U nkn o wn wavc lengths ca n be ca lculated from t h e F ab r y-Per ot patte rn s obtain ed w i t h a la rge et>, lo n spacing, even w i t ho ut pri o r kn ow led ge o f t he ph ase shift of th e r efl ectill 'i surfaces. ' Vh en t he t heo r eti ca l ph ase shift as a fun ct i on of wave length is kn ow n approx ilY'.ately, t hen t he co rrect ord er s of in terfer ence ca n be determin ed fo r both t he Fabry -P ero t frin ges 2:1d frin ges of eq ual chro mati c o rd er. F r om t he wavelengths of t h e latter t he p hase sh if t dispersio n ca n b e m eas u red t o a n accuracy of ab ou t J 0 A. Th e rr>.e t hod is es pec ially useful f or refl ecto rs w i t h la rge dispersio n of p hase shift, such as multi laye rs. R es u l t s in t he v isi b le sp ect r um ar e r epor ted f or al uminum film s and a pair of diel ectri c 15-laye r broadband refl ecto rs.

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Section: Resultsmentioning

confidence: 99%

Phase shift effects in Fabry-Perot interferometry

Koester¹

1960

J. RES. NATL. BUR. STAN. SECT. A.

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“…layers and the same materials of the previous example, the actual wavefront error becomes 0.15 waves. It has been demonstrated 5,6 that an almost perfect compensation can be reached if the following relation is satisfied:…”

Section: Chania Greece 9 -12 October 2018mentioning

confidence: 99%

“…The problem has been known for many years 5,6,7,8 , nevertheless the influence of the interference phenomena, taking place in the coating layered structure, on the beam wavefront is frequently underestimated; while more importance is given to roughness and geometrical shape. The inaccurate evaluation of the wavefront distortion can create problems in the space optical systems, as well as in other applications, when severe requirements are imposed on the optical component figure.…”

Section: Introductionmentioning

confidence: 99%

Wavefront control in the design of narrow-and broad-band optical coatings

Piegari

Sytchkova

Taccola

2019

International Conference on Space Optics — ICSO 2018

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The wavefront distortion induced by some optical coatings has often been underestimated with serious consequences in the performance of optical instruments. The typical approach to face such inconvenience consists in modifying the shape of the coated optics by compensating either the bending induced by stress or the geometrical thickness variations in nonuniform coatings. A relevant contribution to the wavefront distortion can also be given by the interference in the coating layers and a standard approach to overcome such problem is not available. In this work the wavefront deformation that is due to the spatial non-uniformity of thin-film optical coatings is analyzed, with the aim of identifying simple structures in which the influence of thickness non-uniformity on the wavefront shape is minimized. Some examples are reported especially for high-reflectance coatings.

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“…The phase-shift dispersion can amplify the effects of slight irregularities in the coating thickness or the substrate surface to produce a significant, and wavelength-dependent, change in the apparent shape of the surface. Ramsay & Ciddor (1967) present a result from Giacomo (1958):…”

Section: Phase-dispersionmentioning

confidence: 99%

An Imaging Fabry-Pérot System for the Robert Stobie Spectrograph on the Southern African Large Telescope

Rangwala

Williams

Pietraszewski³

et al. 2008

The Astronomical Journal

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We present the design of the Fabry-Pérot system of the Robert Stobie Spectrograph on the 10 m class Southern African Large Telescope and its characterization as measured in the laboratory. This system provides spectroscopic imaging at any desired wavelength spanning a bandpass 430-860 nm, at four different spectral resolving powers (λ/∆λ) ranging from 300 to 9000. Our laboratory tests revealed a wavelength dependence of the etalon gap and parallelism with a maximum variation between 600-720 nm that arises because of the complex structure of the broadband multi-layer dielectric coatings. We also report an unanticipated optical effect of this multi-layer coating structure that produces a significant, and wavelength-dependent, change in the apparent shape of the etalon plates. This change is caused by two effects: the physical non-uniformities or thickness variations in the coating layers, and the wavelength dependence of the phase change upon reflection that can amplify these non-uniformities. We discuss the impact of these coating effects on the resolving power, finesse, and throughput of the system. This Fabry-Pérot system will provide a powerful tool for imaging spectroscopy on one of the world's largest telescopes.

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Propriétés chromatiques des couches réfléchissantes multi-diélectriques

Cited by 16 publications

References 0 publications

Phase shift effects in Fabry-Perot interferometry

Phase shift effects in Fabry-Perot interferometry

Wavefront control in the design of narrow-and broad-band optical coatings

An Imaging Fabry-Pérot System for the Robert Stobie Spectrograph on the Southern African Large Telescope

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