Abstract

We report on the assembly of an off-axis reflective imaging system employing freeform, φ-polynomial optical surfaces. The sensitivity of the system to manufacturing errors is studied for both a passive and active alignment approach. The as-built system maintains diffraction-limited performance in the long-wave infrared.

© 2014 Optical Society of America

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References

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  1. K. Fuerschbach, J. P. Rolland, and K. P. Thompson, Opt. Express 20, 20139 (2012).
    [CrossRef]
  2. K. Fuerschbach, J. P. Rolland, and K. P. Thompson, Opt. Express 19, 21919 (2011).
    [CrossRef]
  3. P. J. Smilie, B. S. Dutterer, J. L. Lineberger, M. A. Davies, and T. J. Suleski, Opt. Eng. 51, 013006 (2012).
    [CrossRef]
  4. W. J. Smith, in Modern Lens Design (McGraw-Hill, 2005), pp. 582–584.
  5. K. Fuerschbach, K. P. Thompson, and J. P. Rolland, Opt. Lett. 39, 18 (2014).
    [CrossRef]

2014 (1)

2012 (2)

K. Fuerschbach, J. P. Rolland, and K. P. Thompson, Opt. Express 20, 20139 (2012).
[CrossRef]

P. J. Smilie, B. S. Dutterer, J. L. Lineberger, M. A. Davies, and T. J. Suleski, Opt. Eng. 51, 013006 (2012).
[CrossRef]

2011 (1)

Davies, M. A.

P. J. Smilie, B. S. Dutterer, J. L. Lineberger, M. A. Davies, and T. J. Suleski, Opt. Eng. 51, 013006 (2012).
[CrossRef]

Dutterer, B. S.

P. J. Smilie, B. S. Dutterer, J. L. Lineberger, M. A. Davies, and T. J. Suleski, Opt. Eng. 51, 013006 (2012).
[CrossRef]

Fuerschbach, K.

Lineberger, J. L.

P. J. Smilie, B. S. Dutterer, J. L. Lineberger, M. A. Davies, and T. J. Suleski, Opt. Eng. 51, 013006 (2012).
[CrossRef]

Rolland, J. P.

Smilie, P. J.

P. J. Smilie, B. S. Dutterer, J. L. Lineberger, M. A. Davies, and T. J. Suleski, Opt. Eng. 51, 013006 (2012).
[CrossRef]

Smith, W. J.

W. J. Smith, in Modern Lens Design (McGraw-Hill, 2005), pp. 582–584.

Suleski, T. J.

P. J. Smilie, B. S. Dutterer, J. L. Lineberger, M. A. Davies, and T. J. Suleski, Opt. Eng. 51, 013006 (2012).
[CrossRef]

Thompson, K. P.

Opt. Eng. (1)

P. J. Smilie, B. S. Dutterer, J. L. Lineberger, M. A. Davies, and T. J. Suleski, Opt. Eng. 51, 013006 (2012).
[CrossRef]

Opt. Express (2)

Opt. Lett. (1)

Other (1)

W. J. Smith, in Modern Lens Design (McGraw-Hill, 2005), pp. 582–584.

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Figures (5)

Fig. 1.
Fig. 1.

(a) Optical layout of the freeform LWIR imaging system optimized with φ-polynomial surfaces and (b) layout of the housing structure of the optical system.

Fig. 2.
Fig. 2.

Astigmatism (Z5/6) and coma (Z7/8) Zernike aberration FFDs over an 8°×6° full FOV for the (a) nominal system and with 0.1° tilt of the (b) primary, (c) secondary, and (d) tertiary mirror surfaces.

Fig. 3.
Fig. 3.

As-built subassemblies for the (a) primary, (b) secondary, and (c) tertiary mirrors of the three mirror system that are to be mated to the optical housing. (d) Three mirror optical system with subassemblies mounted to the housing.

Fig. 4.
Fig. 4.

(a) Measured wavefronts for a 3×3 grid of field points spanning an 8mm×6mm FOV for the directly assembled optical system and (b) with the secondary mirror tilted roughly 1 arc min with a 23 μm shim. The RMSWFE in micrometers is displayed within the wavefront for each field.

Fig. 5.
Fig. 5.

Sample LWIR image from the optical system.

Tables (1)

Tables Icon

Table 1. Sensitivity Analysis of the Three Mirror Optical Systema

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