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Frequency-narrowed diode array bar.

Earl Babcock1, Bien Chann, Ian A Nelson

  • 1Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA. edbabcock@wisc.edu

Applied Optics
|June 3, 2005
PubMed
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We developed a method to narrow the frequency of high-power diode bars, reducing linewidth from 1000 GHz to 64 GHz. This technique enhances laser suitability for spin-exchange optical pumping applications.

Area of Science:

  • Optics and Photonics
  • Laser Physics

Background:

  • High-power diode bars are crucial for various applications.
  • Broad linewidths can limit the efficiency of certain laser-based processes.
  • Spin-exchange optical pumping requires spectrally narrow light sources.

Purpose of the Study:

  • To present a method for frequency narrowing multielement high-power diode bars.
  • To demonstrate the effectiveness of the technique on a commercial diode bar.
  • To assess the impact on output power and suitability for specific applications.

Main Methods:

  • Utilized a commercial 60-W, 49-element, 1-cm-long diode array bar operating at 795 nm.
  • Implemented a frequency narrowing technique (details not specified in abstract).
  • Operated the diode bar at an output power of 45 W.

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Main Results:

  • Successfully narrowed the linewidth of the diode bar from 1000 GHz to 64 GHz.
  • Achieved this spectral narrowing with a minimal reduction in output power (33% loss).
  • The resulting laser light exhibits a significantly reduced linewidth.

Conclusions:

  • The described method effectively narrows the frequency of high-power diode bars.
  • The spectrally narrowed laser output is suitable for spin-exchange optical pumping of noble gas nuclei.
  • This technique offers a practical approach to improve laser performance for demanding applications.