Controlling the evolution of nondiffracting speckle by complex amplitude modulation on a phase-only spatial light modulator |
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| Authors: | Angela Dudley Ruslan Vasilyeu Vladimir Belyi Nikolai Khilo Piotr Ropot Andrew Forbes |
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| Institution: | 1. School of Physics, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa;2. CSIR National Laser Centre, P.O. Box 395, Pretoria 0001, South Africa;3. B.I. Stepanov Institute of Physics of NAS of Belarus, Nezalezhnasti Ave., 68, 220072 Minsk, Belarus;1. College of Information Science and Engineering, Fujian Key Laboratory of Light Propagation and Transformation, Huaqiao University, Xiamen, Fujian 361021, China;2. Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China;3. Key Laboratory of Science and Technology on High Energy Laser, China Academy of Engineering Physics, Mianyang 621900, China;1. Department of Electronic Engineering, City University of Hong Kong, Hong Kong SAR, PR China;2. Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061, USA;3. Institute of Information Optics, Zhejiang Normal University, Jinhua, Zhejiang 321004, PR China;4. Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, PR China |
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| Abstract: | In this work we investigate the structure of nondiffracting speckle fields, both experimentally and theoretically. We are able to produce very good agreement between the experimentally recorded and theoretically calculated fields by using complex amplitude modulation on a phase-only spatial light modulator to implement controlled ring-slit experiments for the generation of nondiffracting speckle fields. The structure of the nondiffracting speckle due to binary and continuous phase modulations for both a uniform and a normal distribution is investigated. We find that we are able to engineer whether the nondiffracting field will appear as speckle or a structured zero-order Bessel beam by adjusting the standard deviation in the distribution. Having the ability to control where in the spectrum, from fully-developed nondiffracting speckle to a symmetric zero-order Bessel beam, the nondiffracting field will exist can prove to be a useful resource in the non-destructive testing of materials. |
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