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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 16 — Aug. 3, 2009
  • pp: 13365–13372

Coherence function control of Quantum Dot Superluminescent Light Emitting Diodes by frequency selective optical feedback

Martin Blazek, Wolfgang Elsäßer, Mark Hopkinson, Patrick Resneau, Michel Krakowski, Mattia Rossetti, Paolo Bardella, Mariangela Gioannini, and Ivo Montrosset  »View Author Affiliations

Optics Express, Vol. 17, Issue 16, pp. 13365-13372 (2009)

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Low coherent light interferometry requires broad bandwidth light sources to achieve high axial resolution. Here, Superluminescent Light Emitting Diodes (SLDs) utilizing Quantum Dot (QD) gain materials are promising devices as they unify large spectral bandwidths with sufficient power at desired emission wavelengths. However, frequently a dip occurs in the optical spectrum that translates into high side lobes in the coherence function thereby reducing axial resolution and image quality. We apply the experimental technique of frequency selective feedback to shape the optical spectrum of the QD-SLD, hence optimizing the coherence properties. For well-selected feedback parameters, a strong reduction of the parasitic side lobes by a factor of 3.5 was achieved accompanied by a power increase of 40% and an improvement of 10% in the coherence length. The experimental results are in excellent agreement with simulations that even indicate potential for further optimizations.

© 2009 Optical Society of America

OCIS Codes
(110.4500) Imaging systems : Optical coherence tomography
(230.5590) Optical devices : Quantum-well, -wire and -dot devices
(230.7020) Optical devices : Traveling-wave devices

ToC Category:
Optical Devices

Original Manuscript: May 26, 2009
Revised Manuscript: June 26, 2009
Manuscript Accepted: June 26, 2009
Published: July 20, 2009

Virtual Issues
Vol. 4, Iss. 10 Virtual Journal for Biomedical Optics

Martin Blazek, Wolfgang Elsäßer, Mark Hopkinson, Patrick Resneau, Michel Krakowski, Mattia Rossetti, Paolo Bardella, Mariangela Gioannini, and Ivo Montrosset, "Coherence function control of Quantum Dot Superluminescent Light Emitting Diodes by frequency selective optical feedback," Opt. Express 17, 13365-13372 (2009)

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