Experimental study on subaperture testing with iterative stitching algorithm

College of Mechatronic Engineering and Automation, National University of Defense Technology, Changsha, Hunan, PR China.
Optics Express (Impact Factor: 3.49). 04/2008; 16(7):4760-5. DOI: 10.1364/OE.16.004760
Source: PubMed


Applying the iterative stitching algorithm, we demonstrate the power of subaperture testing through experiments. Naturally the algorithm applies to flats, spherical or aspheric surfaces. We first apply it to a silicon carbide flat mirror with larger aperture than the interferometer's. The testing results help to obtain a high-precision mirror through five iterations of ion beam figuring. The second experiment is 37-subaperture testing of a large spherical mirror. Good consistence is observed between the stitching result and the full aperture test result using a Zygo interferometer. Finally we study the applicability of the algorithm to subaperture testing of a parabolic surface. The stitching result is consistent with the auto-collimation test result. Furthermore, the surface is tested with annular subapertures and also retrieved by our algorithm successfully.

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