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Laser power stabilization for second-generation gravitational wave detectors.

Frank Seifert1, Patrick Kwee, Michèle Heurs

  • 1Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut) and Universität Hannover, Hannover, Germany. frank.seifert@aei.mpg.de

Optics Letters
|June 14, 2006
PubMed
Summary

We stabilized a Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) laser

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Area of Science:

  • Laser Physics
  • Optical Engineering
  • Quantum Optics

Background:

  • Nd:YAG lasers are crucial for various scientific applications.
  • High power and stability are essential for advanced experiments.
  • Existing Nd:YAG laser power stabilization methods have limitations.

Purpose of the Study:

  • To achieve high-precision power stabilization for a Nd:YAG laser.
  • To investigate and mitigate noise sources affecting laser power.
  • To meet stringent stability requirements for applications like gravitational wave detection.

Main Methods:

  • Utilized high-power, low-noise photodetectors.
  • Implemented a direct current (dc)-coupled control loop.
  • Identified and eliminated noise sources including ground loops and beam pointing instability.

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Main Results:

  • Achieved relative power fluctuations as low as 5 x 10(-9) Hz(-1/2) at 10 Hz.
  • Reached stability of 3.5 x 10(-9) Hz(-1/2) up to several kHz.
  • Demonstrated performance near the shot-noise limit with 80 mA photocurrent.

Conclusions:

  • The developed power stabilization technique significantly enhances Nd:YAG laser performance.
  • The achieved stability levels approach the demanding requirements of the Advanced LIGO detector.
  • This work paves the way for more sensitive measurements in fields requiring ultra-stable lasers.