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NIRCAM PUPIL IMAGING LENS MECHANISM AND OPTICAL DESIGN - page 6 / 9

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( X,

Y)

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Y)

Y-FAN 0.5

  • -

    1.00 0.00

RELATIVE FIELD ( 0.03O , 0.14 O)

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5

  • -

    0.5

  • -

    0.5

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1.00, 0.00 RELATIVE FIELD

( 0.02O , 0.14 O)

0.5

Y-FAN 0.5

0.50, -0.50 RELATIVE FIELD

( 0.02O , 0.14 O)

X-FAN 0.5

4

9

  • -

    0.5

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    0.5

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0.00, -1.00 RELATIVE FIELD

( 0.02O , 0.14 O)

3

0.5

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    0.50 -0.50

RELATIVE FIELD ( 0.02O , 0.14 O)

8

0.5

  • -

    0.5

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0.00, 1.00 RELATIVE FIELD

( 0.02O , 0.14 O)

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    0.50 0.50

RELATIVE FIELD ( 0.02O , 0.14 O)

7

0.5

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0.00, 0.00

-0.5

RELATIVE FIELD

0.5

( 0.02O , 0.14 O)

0.5

-0.5

1

-0.5

NIRCam Mono OTE 03/0 2/04

RAY ABERRATIONS ( MILLIMETERS ) 12-Jan-05

-0.5

0.50, 0.50

RELATIVE FIELD

0.5

( 0.02O , 0.14 O)

1884.3750 NM 1875.0000 NM 1865.6250 NM

6

  • -

    0.5

NIRCam Mono OTE 03/0 2/04

RAY ABERRATIONS ( MILLIMETERS ) 12-Jan-05

  • -

    0.5

0.5

  • -

    0.5

1884.3750 NM 1875.0000 NM 1865.6250 NM

Figure 5: Unacceptable aberrations were found during analysis of the single spherical lens

The natural technique to correct for such astigmatism is to use cylindrical or toroidal surfaces, but this technique had limited efficacy. Even a design consisting of two aspheric toroidal lenses had a residual design error of 5.13 waves, which is short of the required 75% Strehl. Looking for some inspiration, we tried wedged spherical lenses, and a considerable improvement resulted. A detailed analysis of this design showed marked improvements in performance, as shown in Figure 6.

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