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Asian Journal of Physics Vol 32, Nos 5 – 8 (2023) 225-235

The Sheridan source:A novel coherent illumination source using a time varying
specklefield and a digital micro-mirror device

Damien P Kelly1 and Unnikrishnan Gopinathan2
1Institute for Lasertechnologies in Medicine and Metrology(ILM), Helmholtzstr.12,89081Ulm,Germany
2Instruments Research and Development Establishment, Raipur Road, Dehradun-248 008 (Uttarakhand), India.
Dedicated in memory of Prof John Sheridan

In this manuscript we propose and discuss a novel type of illumination source that consists of a (possibly but not necessarily) time-varying speckle field and Digital Micro-mirror Device (DMD) with associated combining optics. We assume that a paraxial optics regime is sufficiently accurate to model the optical systems described here. We, first conduct a brief review of general illumination modalities including Koehler and Critical illumination and where they find common application. We, then turn our attention to the spatial light modulator in the system which is an array of tiny micro-mirrors that can be rapidly (22KHz) turned ON and OFF. A detailed schematic of our proposed illumination system, which we refer to as a Sheridan source, is then discussed. The mathematical form of the resulting illumination field is derived and we examine some of its theoretical properties. Several different applications are proposed including how such a source could be used in new types of imaging systems within a computational optics frame work. © Anita Publications. All rights reserved.
Keywords: Speckle field, Digital Micro-mirror Device, Illumination optics, Coherence theory, Fourier optics, Structured illumination.

Peer Review Information
Method: Single- anonymous; Screened for Plagiarism? Yes
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References

  1. Sasián J M, Introduction to lens design, (Cambridge University Press), 2019.
  2. Hardeberg J Y, Red eye removal using digital color image processing, IS&T’s 2001 PICS Conference Proceedings, (2001)283–287.
  3. Goodman J, Introduction to Fourier Optics, Second edn, (McGraw-Hill, NewYork),1966.
  4. Lohmann A W, Optical Information Processing, (Universitätsverlag Ilmenau), 2006.
  5. Gopinathan U, Pedrini G, Osten W, Coherence effects in digital in-line holographic microscopy, J Opt Soc Am A, 25(2008)2459–2466.
  6. T Instruments,“https://www.ti.com/product/dlp801xe,”.
  7. Huang Y.-C, Pan J.-W, High contrast ratio and compact-sized prism for dlp projection system, Opt Express, 22(2014)17016–17029.
  8. Ulusoy E, Onural L, Ozaktas H M, Synthesis of three-dimensional light fields with binary spatial light modulators, J Opt Soc Am A, 28(2011)1211-1223.
  9. Gopinathan U, Monaghan D S, Hennelly B M, Elhinney C P M, Kelly D P, McDonald J, Naughton T J, Sheridan J T, A projection system for real world three-dimensional objects using spatial light modulators, J Disp Technol, 4(2008)254-261.
  10. Monaghan D S, Gopinathan U, Kelly D P, Naughton T J, Sheridan J T, Systematic errors of an optical encryption system due to the discrete values of a spatial light modulator, Opt Eng, 48 (2009)027001; doi.org/10.1117/1.3076208.
  11. Goodman J W, Statistical Optics, (John Wiley and Sons), 1985.
  12. Goodman J W, Speckle Phenomena in Optics, (Roberts and Company), 2007.
  13. Li D, Kelly D P, Sheridan J T, Three-dimensional static speckle fields. part i. theory and numerical investigation, J Opt Soc Am A, 28(2011)1896-1903.
  14. Li D, Kelly D P, Sheridan J T, Three-dimensional static speckle fields. part ii. experimental investigation, J Opt Soc Am A, 28(2011)1904-1908.
  15. Li D, Kelly D P, Kirner R, Sheridan J T, Speckle orientation in paraxial optical systems, Appl Opt, 51(2012)A1–A10.
  16. Li D, Kelly D P, Sheridan J T, K speckle: space-time correlation function of doubly scattered light in an imaging ystem, J Opt Soc Am A, 30(2013)969–978.
  17. Shirley L G, George N, Speckle from a cascade of two thin diffusers, J Opt Soc Am A, 6(1989)765–781.
  18. Li D, Kirner R, Kelly D P, Sheridan J T, Speckle: two new metrology techniques, in “Optical Modelling and Design II,” , vol. 8429, Wyrowski F, Sheridan J T, Tervo J, Meuret Y, (eds), International Society for Optics and Photonics (SPIE, 2012), vol 8429, p 84290X.
  19. Situ G, Ryle J P, Gopinathan U, Sheridan J T, Generalized in-line digital holographic technique based on intensity measurements at two different planes, Appl Opt, 47(2008)711–717.
  20. Kelly D P, Hennelly B M, Pandey N, Naughton T J, Rhodes W T, Resolution limits in practical digital holographic systems, Opt Eng, 48(2009)095801; doi.org/10.1117/1.3212678.
  21. Kelly D P, Healy J J, Hennelly B M, Sheridan J T, Quantifying the 2.5d imaging performance of digital holographic systems, J Eur Opt Soc Rap Public, 6(2011)11034;doi. 10.2971/jeos.2011.11034.
  22. Kelly D P, A simple optical system for interpreting coherence theory, ArXiv e-prints 1609.05734, (2016).
  23. Ayoub A B, Psaltis D, High speed, complex wavefront shaping using the digital micro-mirror device, Sci Rep, 11(2021)18837; doi.org/10.1038/s41598-021-98430-w.
  24. Goorden S A, Bertolotti J, Mosk A P, Superpixel-based spatial amplitude and phase modulation using a digital micromirror device, Opt Express, 22(2014)17999–18009.
  25. Cabezas L, Amaya D, Bolognini N, Lencina A, Speckle fields generated with binary diffusers and synthetic pupils implemented on a spatial light modulator, Appl Opt, 54(2015)5691–5696.

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