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Related Experiment Videos

Effective bandwidth reduction for a high-power laser-diode array by an external-cavity technique.

Yujin Zheng1, Hirofumi Kan

  • 1Central Research Laboratory, Hamamatsu Photonics K.K., 5000 Hirakuchi, Hamamatsu, Shizuoka 434-8601, Japan. y-zheng@crl@crl.hpk.co.jp

Optics Letters
|October 4, 2005
PubMed
Summary

High-power laser-diode array bandwidth was suppressed using an off-axis external cavity. This technique reduced spectral bandwidth by 14-fold while maintaining high output power.

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Area of Science:

  • Optics and Photonics
  • Laser Technology

Background:

  • High-power laser-diode arrays are crucial for various applications.
  • Spectral bandwidth can limit performance in certain applications.
  • External cavity techniques offer potential for spectral control.

Purpose of the Study:

  • To investigate the suppression of spectral bandwidth in high-power laser-diode arrays.
  • To evaluate the effectiveness of an off-axis external-cavity technique.
  • To assess the impact on output power.

Main Methods:

  • An off-axis external-cavity technique was employed.
  • The external cavity comprised a beam-transformation system and off-axis volume Bragg gratings.
  • Experiments were conducted at a drive current of 40 A.

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Main Results:

  • The spectral bandwidth's full width at half-maximum was reduced from 3.3 nm to 0.24 nm.
  • A 14-fold reduction in bandwidth was achieved.
  • An output power of 20 W was obtained, representing 87% of free-running power.

Conclusions:

  • The off-axis external-cavity technique effectively suppresses spectral bandwidth in high-power laser-diode arrays.
  • This method allows for significant spectral narrowing while preserving high output power.
  • The technique shows promise for applications requiring narrow-linewidth high-power laser sources.