The European Physical Journal Special Topics

, Volume 199, Issue 1, pp 149–158 | Cite as

Optimisation of a low cost SLM for diffraction efficiency and ghost order suppression

  • R. BowmanEmail author
  • V. D’Ambrosio
  • E. Rubino
  • O. Jedrkiewicz
  • P. Di Trapani
  • M. J. Padgett
Regular Article


Spatial Light Modulators (SLMs) are a powerful tool in many optics laboratories, but due to the technology required for their fabrication, they are usually very expensive. Recently some inexpensive devices have been produced, however their phase shift range is less than 2π, leading to a loss of diffraction efficiency for the SLM. We show how to improve the first order diffraction efficiency of such an SLM by adjusting the blazing function, and obtain a 1.5 times increase in first order diffracted power. Even a perfect SLM with 2π phase throw can produce undesired effects in some situations; for example in holographic optical tweezers it is common to find unwanted “ghost spots” near to the array of first-order spots. Modulating the amplitude, by spatially modulating the blazing function, allows us to suppress the ghost spots. This increases the contrast between desired and unwanted spots by more than an order of magnitude.


Ghost European Physical Journal Special Topic Diffraction Efficiency Spatial Light Modulator Fresnel Lens 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© EDP Sciences and Springer 2011

Authors and Affiliations

  • R. Bowman
    • 1
    Email author
  • V. D’Ambrosio
    • 2
  • E. Rubino
    • 3
  • O. Jedrkiewicz
    • 3
  • P. Di Trapani
    • 3
  • M. J. Padgett
    • 1
  1. 1.School of Physics and Astronomy, SUPAUniversity of GlasgowGlasgowScotlandUK
  2. 2.Università degli Studi di Roma “La Sapienza”RomaItaly
  3. 3.CNISM and Università degli Studi dell’InsubriaComoItaly

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