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  • Received: Mar. 1, 2018

    Accepted: Jun. 25, 2018

    Posted: Jan. 17, 2019

    Published Online: Aug. 2, 2018

    The Author Email: Lei Zhang (

    DOI: 10.3788/COL201816.081203

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    Lei Zhang, Sheng Zhou, Dong Li, Jingsong Li, Benli Yu. Model-based adaptive non-null interferometry for freeform surface metrology[J]. Chinese Optics Letters, 2018, 16(8): 081203

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Chinese Optics Letters, Vol. 16, Issue 8, 081203 (2018)

Model-based adaptive non-null interferometry for freeform surface metrology

Lei Zhang1,*, Sheng Zhou1, Dong Li2, Jingsong Li1, and Benli Yu1

Author Affiliations

  • 1Key Laboratory of Opto-Electronic Information Acquisition and Manipulation, Ministry of Education, Anhui University, Hefei 230601, China
  • 2Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China


A model-based adaptive non-null interferometry (MANI) is proposed for steep optical freeform surfaces in situ testing. The deformable mirror (DM) affording the flexible compensation is monitored with the beam in the interferometer by a wavefront sensor. The residual wavefront aberration in the non-null interferogram is eliminated by the multi-configuration ray tracing algorithm based on the system model, especially the DM surface model. The final figure error can be extracted together with the surface misalignment aberration correction. Experiments proving the feasibility of the MANI are shown.

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