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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 7 — Apr. 8, 2013
  • pp: 9081–9090

Despeckling fly’s eye homogenizer for single mode laser diodes

Yosuke Mizuyama, Nathan Harrison, and Riccardo Leto  »View Author Affiliations

Optics Express, Vol. 21, Issue 7, pp. 9081-9090 (2013)

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A novel fly’s eye homogenizer for single mode laser diodes is presented. This technology overcomes the speckle problem that has been unavoidable for fly’s eye homogenizers used with coherent light sources such as single mode laser diodes. Temporal and spatial coherence are reduced simultaneously by introducing short pulse driving of the injection current and a staircase element. Speckle has been dramatically reduced to 5% from 87% compared to a conventional system and a uniform laser line illumination was obtained by the proposed fly’s eye homogenizer with a single mode UV-blue laser diode for the first time. A new spatial coherence function was mathematically formulated to model the proposed system and was applied to a partially coherent intensity formula that was newly developed in this study from Wolf’s theory to account for the results.

© 2013 OSA

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(030.6140) Coherence and statistical optics : Speckle
(030.6600) Coherence and statistical optics : Statistical optics
(140.2020) Lasers and laser optics : Diode lasers
(140.3300) Lasers and laser optics : Laser beam shaping

ToC Category:
Coherence and Statistical Optics

Original Manuscript: January 10, 2013
Revised Manuscript: March 28, 2013
Manuscript Accepted: March 29, 2013
Published: April 4, 2013

Yosuke Mizuyama, Nathan Harrison, and Riccardo Leto, "Despeckling fly’s eye homogenizer for single mode laser diodes," Opt. Express 21, 9081-9090 (2013)

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