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Updated: May 8, 2026

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High-power diode laser bars and shear strain.

Daniel T Cassidy1, O Rehioui, Chadwick K Hall

  • 1Department of Engineering Physics, McMaster University, Hamilton, ON, Canada. cassidy@mcmaster.ca

Optics Letters
|August 14, 2013
PubMed
Summary

Edge emitters in high-power laser bars produce less power due to shear strain. This strain induces photoelastic effects, causing birefringence that reduces light gain and output power at the bar edges.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • High-power laser bars exhibit reduced output power from edge emitters compared to central ones.
  • The underlying cause for this power discrepancy has been a subject of investigation.

Purpose of the Study:

  • To investigate the cause of reduced power output in edge emitters of high-power laser bars.
  • To elucidate the role of shear strain and photoelastic effects in this phenomenon.

Main Methods:

  • Analysis of strain distribution in laser bar bonding.
  • Theoretical modeling of photoelastic effects on light polarization.
  • Correlation of polarization changes with output power measurements.

Main Results:

  • Shear strain is concentrated at the edges of laser bars due to bonding-induced stress.

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  • This shear strain induces photoelastic effects, creating birefringence.
  • Birefringence rotates the plane of polarization, reducing net gain for lasing modes.

    • Conclusions:

    • Shear strain-induced birefringence is the primary cause of lower output power in edge emitters.
    • Understanding this effect is crucial for optimizing high-power laser bar design and performance.