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Speckle reduction in double-pass retinal images.

Donatus Halpaap1,2, Carlos E García-Guerra2, Meritxell Vilaseca2

  • 1Departament de Física, Universitat Politècnica de Catalunya, St. Nebridi 22, 08222, Terrassa, Barcelona, Spain.

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Superluminescent diodes (SLEDs) offer a low-speckle alternative for eye optical quality measurements. This study found SLEDs provide similar speckle reduction to laser diodes with vibrating mirrors, simplifying double pass systems.

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Area of Science:

  • Ophthalmology
  • Optical Engineering
  • Biomedical Optics

Background:

  • The double pass (DP) technique is crucial for assessing ocular optical quality by measuring the point spread function.
  • Laser diodes (LDs) are commonly used in DP systems for their high brightness but produce speckle, necessitating solutions like vibrating mirrors.

Purpose of the Study:

  • To compare speckle generation from different semiconductor light sources for DP systems.
  • To evaluate superluminescent diodes (SLEDs) as a potential all-optical solution for speckle reduction in DP measurements.

Main Methods:

  • Comparative analysis of speckle produced by laser diodes (LDs), light emitting diodes (LEDs), and SLEDs.
  • Evaluation of speckle reduction achieved with a vibrating mirror in conjunction with LD illumination.

Main Results:

  • Superluminescent diodes (SLEDs) demonstrated significantly lower speckle compared to light emitting diodes (LEDs).
  • Speckle levels observed with SLEDs closely matched those achieved using laser diodes (LDs) combined with a vibrating mirror.

Conclusions:

  • SLEDs present a viable, all-optical alternative to laser diodes for illumination in double pass systems.
  • The use of SLEDs can simplify DP system design by potentially eliminating the need for mechanical components like vibrating mirrors.