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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Preserving a diffraction-limited beam in Ho:YAG laser using coherent polarization locking.

L H Tan1, C F Chua, P B Phua

  • 1DSO National Laboratories, 20 Science Park Drive, Singapore 118230, Singapore.

Optics Letters
|November 21, 2012
PubMed
Summary

This study introduces coherent polarization locking to improve Holmium lasers (Ho:YAG). This technique enhances beam quality and power output by addressing thermal issues in Ho:YAG laser systems.

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Area of Science:

  • Laser physics
  • Solid-state lasers
  • Photonics

Background:

  • Holmium lasers (Ho:YAG) are crucial for various applications but suffer from thermal issues.
  • Thermal lensing and stress-induced birefringence degrade beam quality and limit output power.
  • Conventional laser cavities struggle to mitigate these thermal effects effectively.

Purpose of the Study:

  • To address thermal issues in Ho:YAG lasers.
  • To achieve a diffraction-limited beam quality.
  • To enhance laser performance metrics like absorption and power saturation.

Main Methods:

  • Distributing the laser gain over a larger volume.
  • Implementing a coherent polarization locking technique.
  • Comparing performance against a conventional Ho:YAG laser cavity.

Main Results:

  • Demonstrated increased single-pass absorption.
  • Achieved suppression of output power saturation.
  • Showcased significant improvement in beam quality.
  • Generated 10 watts of continuous-wave (CW) Ho:YAG laser power.
  • Attained >96% coherent combining efficiency.

Conclusions:

  • Coherent polarization locking effectively overcomes thermal issues in Ho:YAG lasers.
  • The technique significantly improves beam quality and output power.
  • This method offers a viable solution for high-power, high-quality Ho:YAG laser generation.