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Characterization of Micro-lenslet Array Using Digital Holographic Interferometric Microscope

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Optics, Photonics and Laser Technology

Part of the book series: Springer Series in Optical Sciences ((SSOS,volume 218))

Abstract

When laser light is transmitted through a transparent micro-lenslet array, a phase shift is induced in the transmitted wavefront, depending on the height variation and refractive index of the micro-lenslet array. In this paper, digital holographic interferometric microscope (DHIM) with Fresnel reconstruction method is demonstrated for the characterization of micro-lenslet array. Measurement of diameter (D), sag height (h), radius of curvature (ROC), focal length (f) and shape of micro-lenses are presented in the paper. The height profile of micro-lenses measured by DHIM is compared with commercially available Coherence Correlation Interferometer (CCI) from Taylor Hobson Ltd. UK with axial resolution 0.1 Å. The root mean square error (RSME) between the measurement carried out by DHIM and CCI is 0.12%. The advantage of using the DHIM is that the distortions in the wavefronts due to aberrations in the optical system can be avoided by the interferometric comparison of reconstructed phase with and without the micro-lenslet array.

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Acknowledgements

The financial assistance received from the Defence Research and Development Organization (DRDO), Ministry of Defence, Government of India, under the project entitled ‘Testing of micro optics using digital holographic interferometry’ under FA sanction No. ERIP/ER/1300466/M/01/1556 dated 20 Nov. 2014 is highly acknowledged.

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Authors and Affiliations

  1. Laser Applications and Holography Laboratory, Instrument Design Development Centre, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India

    Varun Kumar & Chandra Shakher

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  1. Varun Kumar
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  2. Chandra Shakher
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Correspondence to Chandra Shakher .

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Editors and Affiliations

  1. Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal

    Paulo A. Ribeiro

  2. Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal

    Maria Raposo

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Kumar, V., Shakher, C. (2018). Characterization of Micro-lenslet Array Using Digital Holographic Interferometric Microscope. In: Ribeiro, P., Raposo, M. (eds) Optics, Photonics and Laser Technology. Springer Series in Optical Sciences, vol 218. Springer, Cham. https://doi.org/10.1007/978-3-319-98548-0_2

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