NAOMI OPTICAL DESIGN wht-naomi-81
Document Number
N/EA/OPTIC3/DOC
Version date 6/9/96
1. DESCRIPTION
The f/10.94 beam and +/- 1.5
arcmin FOV from the WHT (plate scale=4.51”/mm or 222 mm/arcsec) are collimated by an off-axis
paraboloid P1 (Rc= 1213.702 ; clear
aperture=110mm;off-axis angle of 14
degrees; off-axis distance 149.024),mounted in a fast-steering platform . The
56 mm collimated beam is then reflected by a deformable mirror positioned at
the pupil image of the primary mirror and then converted to a f/16.83 beam by a second off-axis paraboloid P2 (Rc=
1785.015; clear aperture 170mm; off-axis angle of 21.2774,off-axis distance
335.304). The plate scale at the f/16.83 is 2.93”/mm or 341 mm/arcsec).A dichroic (6mm thick and tilted by
31.75 deg.), reflecting the IR and
transmitting the Visible is
inserted at 800 mm from P2. In the visible path a field lens (doublet) and a
set of pick-off mirrors feed the
tracking sensor,the wavefront sensors and the acquisition camera.
2. OPTICAL LAYOUT
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FIELD
LENS :
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3. IMAGE QUALITY
SPOT DIAGRAM : AO+FIELD LENS
|
|
RMS
WAVEFRONT ERROR VS FIELD (AO+FIELD LENS)
|
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RMS WAVEFRONT ERROR VS FIELD
(AO+DICHROIC+FIELD LENS)
|
|
SPOT
DIAGRAM (AO+DICHROIC+FIELD LENS)
|
|
ENCIRCLED ENERGY (AO+DICHROIC +FIELD LENS)
|
|
SPOT DIAGRAM : AO
(NO FIELD LENS; COMMON PATH).
|
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ENCIRCLED ENERGY :
AO (NO FIELD LENS;COMMON PATH)
|
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RMS
WAVEFRONT ERROR VS FIELD
(COMMON-PATH)
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3. GENERAL LENS DATA
Surfaces : 43
Stop : 5
System Aperture :Entrance
Pupil Diameter
Ray aiming : Off
Apodization :Uniform, factor = 0.000000
Eff. Focal Len. : -65850.4 (in air)
Eff. Focal Len. : -65850.4 (in image space)
Total Track :
10519.1
Image Space F/# : 15.7537
Para. Wrkng F/# : 15.759
Working F/# :
16.7863
Obj. Space N.A. : 2.09e-007
Stop Radius :
2090
Parax. Ima. Hgt.: 28.7327
Parax. Mag. : 0
Entr. Pup. Dia. : 4180
Entr. Pup. Pos. : 8394.4
Exit Pupil Dia. : 254.176
Exit Pupil Pos. : 3904.25
Field Type : Angle in degrees
Maximum Field :
0.025
Primary Wave :
0.550000
Lens Units : Millimetres
Angular Mag. :
16.4453
Fields : 7
Field Type: Angle in degrees
# X-Value
Y-Value Weight
1 0.000000
0.000000 1.000000
2 0.000000
0.008330 1.000000
3 0.000000
-0.008330 1.000000
4 0.000000
0.025000 1.000000
5 0.000000
-0.025000 1.000000
6 0.025000
0.000000 1.000000
7 -0.025000
0.000000 1.000000
Wavelengths : 3
Units: Microns
# Value
Weight
1 0.550000
1.000000
2 0.700000
1.000000
3 1.000000
1.000000
SURFACE DATA SUMMARY
(WHT+IMAGE ROTATOR+AO+FIELD LENS)
Surf Type Comment
Radius Thickness Glass Diameter Conic
OBJ STANDARD
Infinity Infinity
1 STANDARD
Infinity 400 4187.325
2 STANDARD
Infinity 0 4186.976
3 STANDARD
Infinity 0 4186.976
4 STANDARD
Infinity 7994.4 4186.976
STO STANDARD
Infinity 105.9 4180
6 STANDARD
-20879 -8034.961 MIRROR
4180.001 -1
7 STANDARD
-6231.38 9969.75 MIRROR
972.0992 -2.53287
8 STANDARD
Infinity 84
9 COORDBRK
-------- 0 --------
10 STANDARD
Infinity 0 MIRROR 178.5608
11 COORDBRK
-------- -134 --------
12 COORDBRK
-------- 0 --------
13 STANDARD
Infinity 0 MIRROR 83.67378
14 COORDBRK
-------- 134 --------
15 COORDBRK
-------- 0 --------
16 STANDARD
Infinity 0 MIRROR 127.2986
17 COORDBRK
-------- -163 --------
18 STANDARD Infinity -50 44.38411
19 STANDARD
Infinity -616 39.98415
20 COORDBRK
-------- 0 --------
21 STANDARD
Infinity -9.1489
22 COORDBRK
-------- 0 --------
23 STANDARD
1213.702 0
MIRROR 110.0 -1
24 COORDBRK
-------- 9.1489 --------
25 STANDARD
Infinity 645
26 COORDBRK
-------- 0 --------
27 STANDARD
Infinity 0 MIRROR 57.51365
28 COORDBRK
-------- 0 --------
29 STANDARD
Infinity -650 57.30973
30 STANDARD
Infinity -1050 98.52954
31 STANDARD
Infinity -31.4924
32 COORDBRK
-------- 0 --------
33 STANDARD
1785.015 0 MIRROR 170.0 -1
34 COORDBRK
-------- 0 --------
35 STANDARD
Infinity 31.4924
36 COORDBRK
-------- 0 --------
37 STANDARD
Infinity 800
38 STANDARD
Infinity 99 74.98465
39 STANDARD
-531.1744 4.256 BK7 63.95176
40 STANDARD
143.2352 5.5 LLF6 63.66394
41 STANDARD
Infinity 19.25 63.59303
42 STANDARD
Infinity 0 62.50112
IMA STANDARD
Infinity 0 62.50112
SURFACE DATA DETAIL:
Surface OBJ : STANDARD
Surface 1
: STANDARD
Surface 2
: STANDARD
Aperture : Circular
Aperture
Minimum Radius :
609
Maximum Radius :
2200
Surface 3
: STANDARD
Surface 4
: STANDARD
Surface STO : STANDARD
Surface 6
: STANDARD
Surface 7
: STANDARD
Surface 8
: STANDARD
Surface 9
: COORDBRK
Decenter X : 0
Decenter Y : 0
Tilt About X : 60
Tilt About Y : 0
Tilt About Z : 0
Surface 10
: STANDARD
Surface 11
: COORDBRK
Decenter X : 0
Decenter Y : 0
Tilt About X : 60
Tilt About Y : 0
Tilt About Z : 0
Surface 12
: COORDBRK
Decenter X : 0
Decenter Y : 0
Tilt About X : -30
Tilt About Y : 0
Tilt About Z : 0
Surface 13
: STANDARD
Surface 14
: COORDBRK
Decenter X : 0
Decenter Y : 0
Tilt About X : -30
Tilt About Y : 0
Tilt About Z : 0
Surface 15
: COORDBRK
Decenter X : 0
Decenter Y : 0
Tilt About X : 60
Tilt About Y : 0
Tilt About Z : 0
Surface 16
: STANDARD
Surface 17
: COORDBRK
Decenter X : 0
Decenter Y : 0
Tilt About X : 60
Tilt About Y : 0
Tilt About Z : 0
Surface 18
: STANDARD
Surface 19
: STANDARD
Surface 20
: COORDBRK
Decenter X : 0
Decenter Y : 0
Tilt About X : -14
Tilt About Y : 0
Tilt About Z : 0
Surface 21
: STANDARD
Surface 22
: COORDBRK
Decenter X : 0
Decenter Y : -149.024
Tilt About X : 0
Tilt About Y : 0
Tilt About Z : 0
Surface 23
: STANDARD
Aperture : Circular
Aperture
Minimum Radius :
0
Maximum Radius :
66.5
Y- Decenter : 149.024
Surface 24
: COORDBRK
Decenter X : 0
Decenter Y : 149.024
Tilt About X : 0
Tilt About Y : 0
Tilt About Z : 0
Surface 25
: STANDARD
Surface 26
: COORDBRK
Decenter X : 0
Decenter Y : 0
Tilt About X : 7
Tilt About Y : 0
Tilt About Z : 0
Surface 27
: STANDARD
Surface 28
: COORDBRK
Decenter X : 0
Decenter Y : 0
Tilt About X : 7
Tilt About Y : 0
Tilt About Z : 0
Surface 29
: STANDARD
Surface 30
: STANDARD
Surface 31
: STANDARD
Surface 32
: COORDBRK
Decenter X : 0
Decenter Y : -335.304
Tilt About X : 0
Tilt About Y : 0
Tilt About Z : 0
Surface 33
: STANDARD
Aperture : Circular
Aperture
Minimum Radius :
0
Maximum Radius :
88.5
Y- Decenter : 335.304
Surface 34
: COORDBRK
Decenter X : 0
Decenter Y : 335.304
Tilt About X : 0
Tilt About Y : 0
Tilt About Z : 0
Surface 35
: STANDARD
Surface 36
: COORDBRK
Decenter X : 0
Decenter Y : 0
Tilt About X : 21.2774
Tilt About Y : 0
Tilt About Z : 0
Surface 37
: STANDARD
Surface 38
: STANDARD
Surface 39
: STANDARD
Surface 40
: STANDARD
Surface 41
: STANDARD
Surface 42
: STANDARD
Surface IMA : STANDARD
SOLVE AND VARIABLE DATA:
Semi Diam 8
: Fixed
Semi Diam 21
: Fixed
Semi Diam 23
: Fixed
Thickness of 24
: Solve, pick up value from 21, scaled by -1.00000
Parameter 2 Surf
24: Pickup from 22 times -1.000000
Semi Diam 25
: Fixed
Semi Diam 31
: Fixed
Semi Diam 33
: Fixed
Parameter 2 Surf
34: Pickup from 32 times -1.000000
Thickness of 35
: Solve, pick up value from 31, scaled by -1.00000
Semi Diam 35
: Fixed
Semi Diam 37
: Fixed
INDEX OF REFRACTION DATA:
Surf Glass 0.550000
0.700000 1.000000
39 BK7
1.51852239 1.51306400 1.50750220
40 LLF6 1.53404072 1.52682584 1.52013994
F/# DATA:
F/# calculations consider
vignetting factors and ignore surface apertures.
Wavelength:
0.550000 0.700000 1.000000
# Field Tan Sag Tan Sag Tan Sag
1 0.0000, 0.0000
deg: 16.7863 16.7863 16.7865 16.7865
16.7851 16.7851
2 0.0000, 0.0083
deg: 16.6264 16.7899 16.6266 16.7902
16.6250 16.7887
3 0.0000, -0.0083
deg: 16.9702 16.7900 16.9703 16.7903
16.9687 16.7888
4 0.0000, 0.0250
deg: 16.3765 16.8193 16.3756 16.8193
16.3732 16.8174
5 0.0000, -0.0250
deg: 17.4158 16.8209 17.4149 16.8208
17.4122 16.8189
6 0.0250, 0.0000
deg: 16.8145 16.8894 16.8144 16.8884
16.8125 16.8859
7 -0.0250, 0.0000
deg: 16.8145 16.8894 16.8144 16.8884
16.8125 16.8859
GLOBAL VERTEX COORDINATES
AND DIRECTIONS:
Surf X coord Y coord Z
coord X direc Y direc
Z direc
1 0.000000 0.000000 0.000000 0.000000 0.000000
1.000000
2 0.000000 0.000000 400.000000 0.000000 0.000000
1.000000
3 0.000000 0.000000 400.000000 0.000000 0.000000
1.000000
4 0.000000 0.000000 400.000000 0.000000 0.000000
1.000000
5 0.000000 0.000000 8394.400000 0.000000 0.000000
1.000000
6 0.000000 0.000000 8500.300000 0.000000 0.000000
1.000000
7 0.000000 0.000000 465.339000 0.000000 0.000000
1.000000
8 0.000000 0.000000 10435.089000 0.000000 0.000000
1.000000
9 0.000000 0.000000 10519.089000 0.000000 -0.866025 0.500000
10 0.000000 0.000000 10519.089000 0.000000
-0.866025 0.500000
11 0.000000 0.000000 10519.089000 0.000000 -0.866025
-0.500000
12 0.000000 116.047404 10586.089000 0.000000 -1.000000
-0.000000
13 0.000000 116.047404 10586.089000 0.000000 -1.000000
-0.000000
14 0.000000 116.047404 10586.089000 0.000000 -0.866025 0.500000
15 0.000000 -0.000000 10653.089000 0.000000 -0.866025
-0.500000
16 0.000000 -0.000000 10653.089000 0.000000 -0.866025
-0.500000
17 0.000000 -0.000000 10653.089000
0.000000 0.000000 -1.000000
18 0.000000 -0.000000 10816.089000 0.000000 0.000000 -1.000000
19 0.000000 -0.000000 10866.089000 0.000000 0.000000 -1.000000
20 0.000000 -0.000000 11482.089000 0.000000 -0.241922
-0.970296
21 0.000000 -0.000000 11482.089000 0.000000 -0.241922
-0.970296
22 0.000000 146.810670 11454.913970 0.000000 -0.241922
-0.970296
23 0.000000 146.810670 11454.913970 0.000000 -0.241922
-0.970296
24 0.000000 2.213319 11490.966139 0.000000 -0.241922
-0.970296
25 0.000000 -0.000000 11482.089000 0.000000 -0.241922
-0.970296
26 0.000000 -156.039623 10856.248257 0.000000 -0.121869
-0.992546
27 0.000000 -156.039623 10856.248257 0.000000 -0.121869
-0.992546
28 0.000000 -156.039623 10856.248257 0.000000 0.000000 -1.000000
29 0.000000 -156.039623 10856.248257 0.000000 0.000000 -1.000000
30 0.000000 -156.039623 11506.248257 0.000000 0.000000 -1.000000
31 0.000000 -156.039623 12556.248257 0.000000 0.000000 -1.000000
32 0.000000 179.264377 12587.740657 0.000000 0.000000 -1.000000
33 0.000000 179.264377 12587.740657 0.000000 0.000000 -1.000000
34 0.000000 -156.039623 12587.740657 0.000000 0.000000 -1.000000
35 0.000000 -156.039623 12587.740657 0.000000 0.000000 -1.000000
36 0.000000 -156.039623 12556.248257 0.000000 0.362884 -0.931834
37 0.000000 -156.039623 12556.248257
0.000000 0.362884 -0.931834
38 0.000000 134.267339 11810.780707 0.000000 0.362884 -0.931834
39 0.000000 170.192825 11718.529097 0.000000 0.362884 -0.931834
40 0.000000 171.737258 11714.563210 0.000000 0.362884 -0.931834
41 0.000000 173.733119 11709.438120 0.000000 0.362884 -0.931834
42 0.000000 180.718630 11691.500308 0.000000 0.362884 -0.931834
43 0.000000 180.718630 11691.500308 0.000000 0.362884 -0.931834
4. TOLERANCE ANALYSIS (CODEV)
D E
F I N I T I O N O F P A R A M E T E R T Y P E S
BRL Rotation
(in radians) of the group of surfaces about the Z‑axis
BTX Tilt in X
(in radians) of the group of surfaces about the pole of the first surface
BTY Tilt in Y
(in radians) of the group of surfaces about the pole of the first surface
CYD Cylinder
(at 45 degrees) irregularity in fringes at
546.1 nm. over the clear aperture
CYN Cylinder
(at 0 degrees) irregularity in fringes at
546.1 nm. over the clear aperture
DLA Tilt (in
radians) of the surface in the Y‑Z plane about its pole
DLB Tilt (in
radians) of the surface in the X‑Z plane about its pole
DLF Test plate
fit (power) in fringes at 546.1 nm.
over the clear aperture
DLG Rotation
(in radians) of the surface about the Z‑axis
DLR Change of
radius in mm.
DLT Change of thickness in mm.
DLX Lateral
displacement of the surface in the X‑direction in mm.
DLY Lateral
displacement of the surface in the Y‑direction in mm.
DSX Lateral
displacement of the group of surfaces in the X‑direction in mm.
DSY Lateral
displacement of the group of surfaces in the Y‑direction in mm.
TRX Total
indicator runout in X (resulting in a surface tilt) at the clear aperture in
mm.
TRY Total
indicator runout in Y (resulting in a surface tilt) at the clear aperture in
mm.
DSZ Axial
displacement of the group of surfaces in mm.
DAK Conic
constant
DEFINITION OF SURFACE
NUMBERS:
Number Component
19 WHT f/11 focal plane
23 off-axis paraboloid P1
27 Deformable Mirror DM
33 off-axis paraboloid P2
38 f/16.8 focal plane
__________________________________________________________________________
20‑Jun‑96 C O D E V POSITION 1
S E N S I T I V I T Y A N A L Y S I S
RMS WAVEFRONT ABERRATION
WHT +IMROT + AO(1.5)
NOMINAL RMS
= 0.036
changes in
rms rms
Manufacturing
for + and - change DLT S19 DLT S38
errors manufacturing wavefront
errors
type
change
DLR S23
1.0000000v 0.000 0.000 0.000 ‑0.500000 -0.04
DAK S23 0.0010000v 0.000 0.000 0.001 ‑0.055840 -0.15
DAK S33
0.0010000v 0.000 0.000 0.002
0.115487 0.22
DLR S33
2.0000000v 0.000 0.000 0.000 ‑0.194743 0.50
CYD S23 0.2500000v 0.000 0.000 0.000 0.001749
0.00
CYN S23
0.2500000v 0.000 0.000 0.000
0.002296 0.002
CYD S33
0.2500000v 0.000 0.000 0.000 ‑0.000021 0.00
CYN S33
0.2500000v 0.000 0.000 0.000 ‑0.000356 0.00
DLA S23
0.0003000v 0.002 0.000 0.007
0.184111 0.50
DLB S23
0.0003000v 0.001 0.001 0.006
0.000000 0.0
DLA S33
0.0001000v 0.000 0.000 0.002
0.057375 0.16
DLB S33
0.0001000v 0.000 0.000 0.002
0.000000 0.00
DLG S23
0.0010000v 0.000 0.000 0.000
0.000000 0.00
DLG S33 0.0010000v 0.000 0.000 0.000 0.000000
0.00
DLX S23
0.1000000v 0.000 0.000 0.000
0.000000 0.00
DLY S23
0.1000000v 0.000 0.000 0.000
0.114754 0.31
DLX S33
0.1000000v 0.000 0.000 0.000
0.000000 0.00
DLY S33
0.1000000v 0.000 0.000 0.000
0.000441 0.00
DLF S27
1.0000000v 0.000 0.000 0.001 ‑0.391182 0.25
CYD S27
0.2500000v 0.004 0.004 0.016 ‑0.048898 0.03
CYN S27
0.2500000v 0.002 0.007 0.019 ‑0.038269 0.09
DLA S27
0.0001000v 0.000 0.001 0.005 ‑0.095364 -0.21
DLB S27
0.0001000v 0.000 0.000 0.004
0.000000 0.00
DLG S27
0.0010000v 0.000 0.000 0.000
0.000000 0.00
DLX S27
0.1000000v 0.000 0.000 0.000
0.000000 0.00
DLY S27
0.1000000v 0.000 0.000 0.000
0.000000 0.00
DSX S20..37
0.1000000v 0.000 0.000 0.000
0.000000 0.00
DSY S20..37
0.1000000v 0.000 0.000 0.000
0.115196 0.37
DSZ S20..37
0.1000000v 0.000 0.000 0.000 ‑0.131783 0.00
BTX S20..37
0.0010000v 0.000 0.000 0.001
0.000000 0.00
BTY S20..37
0.0010000v 0.000 0.000 0.001
0.329162 0.50
BRL S20..37
0.0010000v 0.000 0.000 0.000
0.000000 0.00
RSS 0.028
PROBABLE CHANGE IN RMS
0.006
PROBABLE CHANGE OF COMPENSATORS (+/‑) dlt s19 0.87
dlt s38 1.04
Units ‑ linear dimensions in mm. angles in radians,
fringes in wavelengths at 546.1 nm.
RMS is in wavelengths (averaged over spectral region)
The probable change in RMS assumes a uniform distribution of
manufacturing
errors over the range for all parameters except tilt and
decenter
which have a truncated Gaussian distribution in X and Y
CUMULATIVE
CHANGE
PROBABILITY
IN RMS
50.0 PCT. 0.002
* If it is assumed that the errors can
84.1 PCT.
0.004 only take on the
extreme values
97.7 PCT.
0.006 * of the tolerances,
the 97.7 percent
99.9 PCT.
0.008 probable change in
RMS is 0.009
‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑
LATERAL IMAGE SHIFT (mm)
MANUFACTURING ERROR SHIFT
TYPE
CHANGE
DLR S23
1.000000
0.000000
DAK S23
0.001000
0.000000
DAK S33 0.001000 0.000000
DLR S33
2.000000
0.000000
CYD S23
0.250000
0.000471
CYN S23
0.250000
0.000000
CYD S33
0.250000
0.000234
CYN S33
0.250000
0.000000
DLA S23
0.000300
0.000000
DLB S23
0.000300 ‑0.549838
DLA S33
0.000100
0.000000
DLB S33
0.000100 ‑0.181758
DLG S23
0.001000
0.000000
DLG S33
0.001000
0.000000
DLX S23
0.100000
0.149853
DLY S23
0.100000
0.000000
DLX S33
0.100000
0.100051
DLY S33
0.100000
0.000000
DLF S27
1.000000
0.000000
CYD S27
0.250000
0.000001
CYN S27
0.250000
0.000000
DLA S27
0.000100
0.000000
DLB S27
0.000100
0.183372
DLG S27
0.001000
0.000000
DLX S27
0.100000
0.000000
DLY S27 0.100000 0.000000
DSX S20..37
0.100000
0.249904
DSY S20..37
0.100000
0.000000
DSZ S20..37
0.100000
0.000000
BTX S20..37
0.001000 ‑0.645878
BTY S20..37
0.001000
0.000000
BRL S20..37
0.001000 ‑0.345966
RSS 1.000376
PERFORMANCE SUMMARY:
WAVELENGTH
1600.0 NM
‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑
RELATIVE
DESIGN DESIGN COMPENSATOR RANGE (+/‑) *
FIELD + TOL *
DLT S19 DLT S38
0.00, 0.00 0.036
0.042
0.872514 1.037480
0.00,‑1.00 0.174
0.180
0.872514 1.037480
0.00, 1.00
0.186 0.191 0.872514 1.037480
‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑
* The change in RMS is a mean plus 2 Sigma value
(97.7 percent)
and assumes a uniform distribution of
manufacturing errors over the range
for all tolerances except decentration errors
which have a truncated
Gaussian distribution in X and Y
The compensator range is a mean plus 2 Sigma
value.
Linear compensators are in units of millimeters.
5.
TECHNICAL SPECIFICATION AND
ADJUSTMENTS REQUIRED FOR THE OFF-AXIS PARABOLOIDS:
These are related to the
precision achieved in the manufacturing of the off-axis paraboloids and the
image quality required at the f/16.8 focus. I assumed that the rms wavefront
error shall be <150 nm over the central 1 arcmin field and <300nm at the
edge of the field. Practically the
deformable mirror should be able to correct for imperfect optics as well as
telescope aberrations and atmospheric wavefront errors.
The 2 off-axis mirrors will be manufactured with a surface
accuracy of 125 nm P-V or 25 nm RMS over the clear aperture. The off-axis
distance of P1 will be 149.0±0.5 mm and P2 335.3±0.5mm. Their respective focal
lengths (measured along optical axis from vertex to focus position ) are
606.85±3.0 mm and 892.51±4.0 mm.
The adjustments on the tilt
of the OAP that are required for
alignment and testing: 2 axis tilts
covering a 6 deg angular range with a 0.3 arcsec angular resolution and 3 linear motions (x,y,z) covering ±10 mm
travel range and a linear resolution <2mm.
6. TOLERANCE REQUIREMENT ON FLEXURE,THERMAL,VIBRATION...FOR THE OPTICS:
An rms of 0.006 arcsec for
jitter on the optical bench means that the image should not shift by more than
2 mm rms at the f/16.8 focal plane. The first
paraboloid P1 should not tilt by more
than 0.22 arcsec and decenter by more
than 1.3 mm ; the second one P2 should not tilt by more than 0.23 arcsec and
decenter by more than 2 mm. The whole optical chassis
should not tilt by more than 0.6 arcsec .