Lens Design II. Lecture 3: Aspheres Herbert Gross. Winter term
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1 Lens Design II Lecture 3: Aspheres 7--3 Herbert Gross Winter term 7
2 Preliminar Schedule Lens Design II Aberrations and optimiation Repetition 3.. Structural modifications Zero operands, lens splitting, lens addition, lens removal, material selection Aspheres Correction with aspheres, Forbes approach, optimal location of aspheres, several aspheres Freeforms Freeform surfaces, general aspects, surface description, qualit assessment, initial sstems Field flattening Astigmatism and field curvature, thick meniscus, plus-minus pairs, field lenses 6.. Chromatical correction I Achromatiation, axial versus transversal, glass selection rules, burried surfaces Chromatical correction II Secondar spectrum, apochromatic correction, aplanatic achromates, spherochromatism Special correction topics I Smmetr, wide field sstems, stop position, vignetting 9.. Special correction topics II Telecentricit, monocentric sstems, anamorphotic lenses, Scheimpflug sstems 8.. Higher order aberrations High NA sstems, broken achromates, induced aberrations 8.. Further topics Sensitivit, scan sstems, eepieces 5.. Mirror sstems special aspects, double passes, catadioptric sstems 3.. Zoom sstems Mechanical compensation, optical compensation Diffractive elements Color correction, ra equivalent model, stralight, third order aberrations, manufacturing Realiation aspects Tolerancing, adjustment
3 3 Contents. Aspheres. Conic sections 3. Forbes aspheres 4. Sstem improvement b aspheres 5. Aspheres in Zemax
4 4 Aspherical Correction Correction of spherical aberration b an asphere a) spherical lens refraction too strong b) aspherical lens asphere reduces power Ref: A. Herkommer
5 5 Conic Sections Explicite surface equation, resolved to Parameters: curvature c = / R conic parameter Influence of on the surface shape cx c x Parameter Surface shape = - paraboloid < - hperboloid = sphere > oblate ellipsoid (disc) > > - prolate ellipsoid (cigar ) Relations with axis lengths a,b of conic sections a b c b a b c a c
6 6 Aspherical Shape of Conic Sections Conic aspherical surface Variation of the conical parameter c c
7 x x c x c x R R R R x x Conic section Special case spherical Cone Toroidal surface with radii R x and R in the two section planes Generalied onic section without circular smmetr Roof surface c x c c x c x x x tan 7 Aspherical Surface Tpes
8 Polnomial Aspherical Surface Standard rotational-smmetric description 8 Basic form of a conic section superimposed b a Talor expansion of ( h) h c h M m a m h m4 h... Radial distance to optical axis h x... Curvature c... Conic constant a m... Apherical coefficients,5,5 h^4 h^6 h^8 h^ h^ h^4 h^6,,4,6,8, h Ref: K. Uhlendorf
9 9 Forbes Aspheres New representation of aspherical expansions according to Forbes (7) ( r) c r c r k max k Special polnomials Q k (r ):. Contributions are orthogonal slope. tolerancing is easil measurable 3. optimiation has better performance 4. usuall fewer coefficients are necessar 5. use of normalied radial coordinate makes coefficients independent on diameter a k Q k ( r ) Two different versions possible: a) strong aspheres: deviation defined along b) mild aspheres: deviation defined perpendicular to the surface
10 Polnomial Aspherical Surface Other descriptions x s s c s c s C s b s b B k A C B A M m N n n m ij M m m m h a h a h k h ) ( ) ( t g t f h Superconic (Grenolds ) Implicit -polnomial asphere (Lerner/Sasian ) Truncated parametric Talor (Lerner/Sasian ) Ref: K. Uhlendorf
11 Simple Asphere Parabolic Mirror Equation Radius of curvature in vertex: R s Perfect imaging on axis for object at infinit Strong coma aberration for finite field angles Applications:. Astronomical telescopes. Collector in illumination sstems R s axis w = field w = field w = 4
12 Parabolic Mirror Equation c : curvature /R s : eccentricit ( = - ) c ( ) c C F ra R sag vertex circle sagittal circle of curvature tangential circle of curvature R tan vertex circle R s parabolic mirror F x R radii of curvature : tan Rs R s parabolic mirror R tan Rs R s R s f 3
13 3 Ellipsoid Mirror Equation c: curvature /R : Eccentricit e c ( ) c b oblate vertex radius Rso F prolate vertex radius R sp a F' ellipsoid
14 4 Simple Asphere Elliptical Mirror Equation Radius of curvature r in vertex, curvature c eccentricit Two different shapes: oblate / prolate Perfect imaging on axis for finite object and image loaction Different magnifications depending on used part of the mirror Applications: Illumination sstems s c ( ) c s' F F'
15 5 Asphere: Perfect Imaging on Axis Perfect stigmatic imaging on axis: elliptical front surface elliptical concentric
16 6 Asphere: Perfect Imaging on Axis Perfect stigmatic imaging on axis: Hperoloid rear surface r s n s n s r n n n s F Strong decrease of performance for finite field sie : dominant coma Alternative: ellipsoidal surface on front surface and concentric rear surface 5 D spot m] w in
17 Gracing Incidence-Xra Telescope Xra telescopewolter tpe I Nested shells with gracing incidence Increase of numerical aperture b several shells paraboloids hperboloids Wolter tpe I towards paraboloid focus point ras detector nested clindrical shells
18 Gracing Incidence-Xra Telescope Woltertp. Paraboloid. Hperboloid
19 9 Aspheres - Geometr Reference: deviation from sphere Deviation along axis Better conditions: normal deviation r s () deviation height tangente () deviation along axis height sphere perpendicular deviation r s aspherical shape spherical surface aspherical contour
20 Aspherical Expansion Order Improvement b higher orders Generation of high gradients (r) 6. order 5 D rms [m] 3 4. order 8. order. order. order r order k max
21 Aspheres: Correction of Higher Order Correction at discrete sampling Large deviations between sampling points Larger oscillations for higher orders Better description: slope, defines ra bending residual spherical transverse aberrations perfect correcting surface Corrected points with ' = corrected points residual angle deviation points with maximal angle error paraxial range ' = c d A /d real asphere with oscillations A
22 Polnomial Aspherical Surface Forbes Aspheres - Q con New orthogonaliation and normaliation using Jacobi-polnomials Q m ( h) h c h M 4 h / h a Q h / h max m m m max requires normaliation radius h max (: conversion to standard aspheres possible),5 Mean square slope M m a m / m 5,5 -,5,,4,6,8, h^4*q h^4*q h^4*q h^4*q3 h^4*q4 h^4*q5 - h Ref: K. Uhlendorf
23 Polnomial Aspherical Surface Forbes Aspheres - Q bfs 3 Limit gradients b special choice of the scalar product (: conversion to standard aspheres not possible) h u u ( h) h M a B / m m h h m u mit u : h,5 max Mean square slope / h max M m a m,,4,6,8, u(-u)b u(-u)b u(-u)b u(-u)b3 u(-u)b4 u(-u)b5 -,5 h Ref: K. Uhlendorf 3
24 4 Forbes Aspheres Strong asphere Q con sag along -axis slope orthogonal true polnom tpe Q in Zemax cr r r a Q r cr kmax 4 ( ) ( ) k k k direct tolerancing of coefficients Mild asphere Q bfs difference to best fit sphere sag along local surface normal not slope orthogonal not a polnomial tpe Q in Zemax cr (r) cr r r c cr M m a B no direct relation of coefficients to slope m m r,5,5,5,,4,6,8, h^4*q h^4*q h^4*q h^4*q3 h^4*q4 h^4*q5,,4,6,8, u(-u)b u(-u)b u(-u)b u(-u)b3 u(-u)b4 u(-u)b5 -,5 - h -,5 h
25 5 Selection of Asphere Tpes Correction of Retro focus tpe camera lens F# =.8, d=, w = 94 Considerabl better resukt and faster optimiation b the use of Q aspheres a) standard asphere b) Qbfs asphere Ref: C. Menke
26 6 Impact of Asphere Asphere far from pupil: - ra bundels of field points separated - field dependend correction - also impact on distortion surface Asphere near pupil: - all ra bundels equall affected - problem field angles: coma surface 5
27 7 Aspherical Single Lens Correction on axis and field point Field correction: two aspheres spherical axis field, tangential field, sagittal 5 m 5 m 5 m a one aspherical 5 m 5 m 5 m a a double aspherical 5 m 5 m 5 m
28 8 Reducing the Number of Lenses with Aspheres Example photographic oom lens Equivalent performance 9 lenses reduced to 6 lenses Overall length reduced a) all spherical 9 lenses Vario Sonnar / f = 8-56 b) with 3 aspheres 6 lenses length reduced aspherical surfaces Ref: H. Zügge
29 9 Reducing the Number of Lenses with Aspheres Example photographic oom lens Equivalent performance 9 lenses reduced to 6 lenses Overall length reduced Photographic lens f = 53 mm, F# = 6.5 a) all spherical, 9 lenses axis field x x 436 nm 588 nm 656 nm p x p p x p b) 3 aspheres, 6 lenses, shorter, better performance axis field x x A A 3 A p x p p x p Ref: H. Zügge
30 3 Reducing the Number of Lenses with Aspheres Binocular Lenses.5x Nearl equivalent performance Distortion, Field curvature and pupil aberration slightl improved lens removed Better ee relief distance a) Binocular.5x, all spherical field curvature in dptr distortion in % tan sag b) Binocular.5x, aspherical surface tan sag
31 3 Lithographic Projection: Improvement b Aspheres Considerable reduction of length and diameter b aspherical surfaces Performance equivalent a) NA =.8 spherical 3 lenses lenses removable b) NA =.8, 8 aspherical surfaces -9% -3% 9 lenses Ref: W. Ulrich
32 3 Best Position of Aspheres Location depending on correction target: spherical : pupil plane coma and astigmatism: field plane No effect on Petval curvature aspherical effect.4.3. spherical coma astigmatism distortion d/p'
33 33 Aspherical Sensitivit 3 spherical aberration Example: Lithographic lens Sensitivities for aspherical correction coma surface index astigmatism surface index distortion surface index..5 S S4 S5 S S6 stop S3 S surface index
34 34 Aspheriation of a Camera Lens Selection of one aspherical surface in a photographic lens S S 5 S 9 S S4..5 spherical aberration coma surface index spherical sstem: 97 nm surface : 96 nm surface 5: 85 nm surface 9: 87 nm surface : 78 nm surface 4: 78 nm astigmatism surface index distortion surface index surface index
35 35 Realiation Aspects for Aspheres Strong asphere : Turning points ''= Deviation from sphere asphere profile (r) r.. derivative '(r) 3 profile deviation (r) r r.5. derivative '(r). derivative ''(r) r r
36 36 Surface properties and settings Setting of surface properties
37 Important Surface Tpes Standard Even asphere Paraxial Paraxial XY Coordinate break Diffraction grating Gradient Toroidal Zernike Fringe sag Extended polnomial Black Box Lens ABCD spherical and conic sections classical asphere ideal lens ideal toric lens change of coordinate sstem line grating gradient medium clindrical lens surface as superposition of Zernike functions generalied asphere hidden sstem, from vendors paraxial segment
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