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NIRCAM PUPIL IMAGING LENS MECHANISM AND OPTICAL DESIGN - page 7 / 9

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( X,

Y)

( X,

Y)

Y-FAN 0.05

  • -

    1.00 0.00

RELATIVE FIELD ( 0.02O , 0.15 O)

X-FAN 0.05

5

  • -

    0.05

  • -

    0.05

0.05

1.00, 0.00 RELATIVE FIELD

( 0.01O , 0.15 O)

0.05

Y-FAN 0.05

0.50, -0.50 RELATIVE FIELD

( 0.01O , 0.15 O)

X-FAN 0.05

4

9

  • -

    0.05

  • -

    0.05

  • -

    0.05

  • -

    0.05

0.05

0.00, -1.00 RELATIVE FIELD

( 0.01O , 0.15 O)

3

0.05

0.05

  • -

    0.50 -0.50

RELATIVE FIELD ( 0.02O , 0.15 O)

8

0.05

  • -

    0.05

  • -

    0.05

  • -

    0.05

  • -

    0.05

0.05

0.00, 1.00 RELATIVE FIELD

( 0.01O , 0.14 O)

2

0.05

0.05

  • -

    0.50 0.50

RELATIVE FIELD ( 0.02O , 0.14 O)

7

0.05

2/04

1884.3750 NM

2/04

1884.3750 NM

1875.0000 NM

1875.0000 NM

RAY ABERRATIONS ( MILLIMETERS )

1865.6250 NM

RAY ABERRATIONS ( MILLIMETERS )

1865.6250 NM

-0.05

0.00, 0.00

-0.05

RELATIVE FIELD

0.05

( 0.01O , 0.15 O)

0.05

Further refinement of the PIL design required finding a balance between PIL optical size and the aperture stop. The use of the POM as an aperture stop resulted in very large diameters of the PIL lens elements (Figure 7), and a refinement was to locate the aperture stop within the PIL group itself (Figure 8). This however led to some vignetting at the edge of the PIL field of view. It was ultimately agreed that the system could handle the small amount of vignetting to gain the advantage of having smaller lens elements.

-0.05

0.50, 0.50

-0.05

RELATIVE FIELD

0.05

( 0.01O , 0.14 O)

0.05

Figures 6: Transverse ray aberrations of various field points in image of circumscribed primary on FPA.

1

6

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NIRCam Mono OTE 03/0

12-Jan-05

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NIRCam Mono OTE 03/0

12-Jan-05

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    0.05

F/14 beams from POM must be stopped down. Place limiting stop on PIL

125.00

MM

125.00

MM

NIRCam Mono OTE 03/02/04

Scale:

0.20

12-Jan-05

NIRCam Mono OTE 03/02/04

Scale:

0.20

12-Jan-05

Figure 7: PIL optical design with POM as aperture stop.

Figure 8: Aperture stop within the PIL group.

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