Optical system design for the charge exchange spectroscopy of the korea superconducting tokamak advanced research device. Impact of large field angles on the requirements for. Enterprise experience radius optical engineering also. The optical solution proposed for janus is a threemirror anastigmat tma with. Table 3 numerical data for coefficients for the aspherical mirror of. Sylvain egron optical designer, cofounder, at iridescence. The basic optical design of nirspec was carried out jointly by ucla scientists and by optics 1, inc. Sylvain egron optical designer, cofounder iridescence. Three mirror anastigmat telescopes optical designs based on three aspheric mirrors dubbed threemirroranastigmat or tma are favored in modern astronomical instrumentation because these telescopes have a wider. A threemirror anastigmat tma system is a typical optical layout developed in recent years. Metal mirror tma, telescopes of jena spaceborne scanners. However, the field of freeform surfaces design techniques still remains underexplored. A full aperture center of curvature optical test is performed in cryogenic vacuum conditions at the integrated observatory level to verify pm performance requirements. A spectrograph including a primary mirror, a secondary mirror, and a tertiary mirror forming a tma having a common vertex axis.
Three mirror, four mirror anastigmat, multispectral stray light control experience. Spotdiagrams for the optical system obtained using optimization with zemax. Impact of large field angles on the requirements for deformable mirror in imaging satellites. In the recent years a significant progress was achieved in the field of design and fabrication of optical systems based on freeform optical surfaces. The spectrograph also may include a collimating mirror, a diffraction grating, and a dispersive prism. Zemax, oslo and fred seem to be lowercost, more basic packages, while synopsys code v and lighttools as well as asap, tracepro, comsol and rsoft seem to be more highend solutions. From various customer requirements, jenaoptronik has derived the jss product line of lowcost optical spaceborne scanners in the visible wavelength range. The telescope requires a wide spectrum and large fov. The newton or cassegrain telescope, associated field correctors.
Experience with software tools to automate optical design and analysis tasks e. Design and development of optical head for solar application optical design of offaxis elliptical mirror system including tolerance analysis in zemax. Optical enclosure temperature three mirror anastigmat of the gianotng. Design of optical systems with toroidal curved detectors. The design and assembly of aluminum mirrors of a three. The design of jost reproduces the physics of jwsts threemirror anastigmat tma using three custom aspheric lenses.
Current optical systems with automated alignment capabilities are typically designed to include a dedicated wavefront sensor. Automation of alignment tasks can provide improved efficiency and greatly increase the flexibility of an optical system. Early in the dsst development, the program manager published a paper. As this forum covers optics as well as atm projects, i thought id share an example of an optical design that is yet another kind of unobstructed reflector, but with a field of view quite a bit wider than typical schiefspieglers, tetras, yolos, stevickpauls, etc. Instrument concept foreoptics and slit viewer spectrograph. Westlake village, ca using both zemax and code v, with an initial optimization of the threemirror anastigmat tma camera being performed by larry siegel of optics 1. While optical design software platforms offer the user many types of freeform surfaces, the uniqueness of the. This is primarily used to enable wide fields of view, much larger than possible with telescopes with just one or two curved surfaces.
Stray light modeling of the james webb space telescope. Optical telescope element ote, and associated spacecraft hardware, including the large sun shield was built using the delivered optical models code v and zemax, cad packages, thermal models, and reported surface coating and scatter property data. It seems that going with a metal secondary would make mounting it a lot simpler. Threemirror anastigmat tma telescope designs have become a widespread design solution for fields of view from 2 to 12 deg. Postdeadline papers, osa postdeadline paper digest online optical society of america, 20, paper fm4b. A threemirror anastigmat is an anastigmat telescope built with three curved mirrors, enabling it to minimize all three main optical aberrations spherical aberration, coma, and astigmatism. By harnessing the power of opticstudio, opticsbuilder, and opticsviewer, optical, mechanical, and manufacturing engineers can speak the same language across the optical product development process. Foreoptics and slit viewer spectrograph alignment plan. Python, matlab, zemax, fred, sigfit, ansys large optics stray light design experience. Designed a diffractionlimited threemirror collimator with aspheric surfaces for use in testing a wideband optical system.
This integrated optomechanical model was constructed in the fred optical engineering software. The fcita telescope optics to is a threemirroranastigmat tma consisting. The user support is supreme and the people who support it are at the top of the ladder. The design s of two imaging freeform sy stems using nurbs optical surfaces are described. Design of lwir imager family for us army thermal weapon sight 2 program. I created a bessel beam using axicon thorlab, input lens data zemax file is used. It has the advantages of no aperture obscuration, compact size, and flat image plane. A threemirror anastigmat telescope comprises at least a concave first mirror, a convex second mirror and a concave third mirror, the three mirrors arranged so that the first mirror and the second mirror form, from an object at infinity, an intermediate image situated between the second mirror and the third mirror, the third mirror forming, from this intermediate image, a final image in the. Imaging freeform optical systems designed with nurbs surfaces.
The collimating mirror and an entrance aperture form an interchangeable module. Combining freeform optics and curved detectors for wide. In this example, we will look at a three mirror anastigmat tma design. Optical system design for the charge exchange spectroscopy. Here, we demonstrate a selfaligning method for a reconfigurable system using only focal plane images. Wpheader for spie use the design and development of. Zemax is the industry standard optical system design software, combining sequential lens design, analysis, optimization, tolerancing, physical optics, nonsequential optical system design, polarization, thinfilm modeling and mechanical cad importexport in a single, easytouse package. Diagram of a ring telescope with thermal control box simulation of. Aperture stop locates at the primary mirror m1, which has clear aperture of 550 mm. The nominal position is calculated with zemax, based on the nominal optical design and the actual measured wfe of each single mirror. They provide a possibility to build fast, wideangle and highresolution systems, which are very compact and free of obscuration.
Simulation of segmented mirrors with adaptive optics. Radiation received through the entrance aperture is reflected in a collimated pattern. The offaxis parabolic mirror is an important design form in the optics industry. According to the first order calculation based upon and optimization by commercial software, optical design layout is shown in fig. It is used for the design and analysis of both imaging and illumination systems. Osa automated alignment of a reconfigurable optical. We also present the first results of structuralthermaloptical performance modeling of the telescope point design. This article demonstrates how to model an offaxis parabolic mirror according to some manufacturer specifications. The designs of two imaging freeform systems using nonuniform rational basisspline nurbs optical surfaces are described. Largeaperture, threemirror telescopes for nearearth space surveillance. A threemirror anastigmat is an anastigmat telescope built with three curved mirrors, enabling it to minimize all three main optical aberrations spherical. Light enters aperture stop, reflected by m2, m3 and folding mirror m4 and reaches focal plane assembly fpa. Spotdiagrams for the optical system obtained using optimization.
Imaging freeform optical systems designed with nurbs. Osa combining freeform optics and curved detectors for. Therefore, the telescope used was an offaxis tma structure composed of three mirrors. Obstructed telescopes vs unobstructed telescopes for wide field. Alignment concept for the three mirror anastigmat telescope. Wfirst, wide field imaging, three mirror anastigmat, telescope, finite element analysis 1. Us20090091753a1 three mirror anastigmat spectrograph. Chrisp, three mirror anastigmat designed with nurbs freeform surfaces, in renewable energy and the environment. Largeaperture, threemirror telescopes for nearearth. Design of a compact spectrometer with large field of view. It also demonstrates use of the chief ray solve for centering the resulting image surface on chief ray path. Gravity effect evaluation for tma telescope based on cmm. Hi all optical designers, beyond contestation, codev is the best commercial optical design code you can get.
Optical design software from zemax design imaging optics, lighting and illumination systems, and laser systems as the industryleading optical design software, opticstudio is used across a wide variety of industries, from aerospace and astronomy, to automotive, biomedical research, consumer electronics, machine vision, and more. A place for questions and discussions pertaining to optical science. Opticstudio is its flagship product and a commonly used optical design program for microsoft windows. Alignment of the three mirror anastigmat of the giano tng high resolution infrared spectrometer i. To gain familiarity with optical and optomechanical design techniques, two systems were studied. To allow for lt measurements, each mirror is equipped with three conical holes for reproducible placement of laser tracker targets ltts. For comparison, two designs meeting the optical requirements have been created with the stop at the secondary. Design of reflective three mirror anastigmat telescope.
A preliminary optical design for the janus camera of esas space. Opticstudio, then called zemax, was originally written by ken moore and was the first optical design program. A complete solution set for allspherical telescopic systems. Wavefront calibration testing of the james webb space. A design method for unobstructed, offaxis, reflective optical system is proposed. Figure 2 fast accurate nurbs optimization program fano. Zemax is a company that sells optical design software.
I am researching the best optical engineering software packages and note that there are a lot of options. The optimal size of blur images for an f4 twomirror anastigmat telescope. A threeasphericalmirror anastigmat telescope comprises means for moving the third mirror linearly along the optical axis of the telescope so as to make the focal length of the telescope change to a plurality of focal lengths between at least a minimum focal length and a maximum focal length, a plurality of aspherical optical components respectively associated with the plurality of focal. Except that of course you cant see through it for testing. Opticstudio is the leading software used by optical engineers throughout the design phase. Largeaperture, threemirror telescopes for nearearth space.
Based on the three mirror anastigmat tma, when pupil and field of view are offaxis properly, obstructing. Three mirror anastigmat example posted in atm, optics and diy forum. I am still interested in the three mirror anastigmat design and there is an interesting version of the bakerpaul design that has mirror 3 formed on the surface of mirror 1 the primary. Analyzed and toleranced threemirror anastigmat telescope for broadband sensing. Metal mirror tma, telescopes of the jss product line. Design work was facilitated with the zemax commercial optical raytracing package. Three mirror anastigmat example atm, optics and diy. Our goal is to break down the function of optical design software with a spreadsheet.
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