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Coherence length tunable semiconductor laser with optical feedback.

Yuncai Wang1, Lingqin Kong, Anbang Wang

  • 1Department of Physics, College of Science, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China. wangyc@tyut.edu.cn

Applied Optics
|February 12, 2009
PubMed
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Researchers experimentally tuned semiconductor laser coherence length using optical feedback. Adjusting feedback strength in the coherence collapse regime significantly shortened coherence length, demonstrating precise control.

Area of Science:

  • Optics and Photonics
  • Semiconductor Device Physics

Background:

  • Semiconductor lasers are crucial light sources with tunable properties.
  • Controlling coherence length is vital for applications like interferometry and sensing.
  • Existing methods for coherence length control can be complex or limited.

Purpose of the Study:

  • To experimentally demonstrate continuous tuning of semiconductor laser coherence length.
  • To investigate the effect of optical feedback strength on coherence length.
  • To explore the relationship between bias current and coherence length under feedback.

Main Methods:

  • Implementing an optical feedback scheme with a semiconductor laser.
  • Operating the laser in a coherence collapse regime.
  • Varying optical feedback strength and monitoring fringe visibility.

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Main Results:

  • Coherence length was successfully tuned by adjusting feedback strength.
  • Coherence length was reduced from meters to 100 micrometers using long-cavity optical feedback.
  • Laser coherence length showed strong dependence on feedback strength, but was insensitive to bias current.

Conclusions:

  • Optical feedback offers an effective method for precisely controlling semiconductor laser coherence length.
  • The coherence collapse regime combined with adjustable feedback provides a versatile tuning mechanism.
  • This technique enables tailoring laser coherence for specific application requirements.