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Subhertz-linewidth Nd:YAG laser.

Stephen A Webster1, Mark Oxborrow, Patrick Gill

  • 1National Physical Laboratory, Queens Road, Teddington, Middlesex, TW11 0LW, UK. saw4@npl.co.uk

Optics Letters
|July 21, 2004
PubMed
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Researchers achieved high-frequency stability for a Nd:YAG laser using two Fabry-Perot etalons. This demonstrates exceptional relative frequency stability at the part-in-10(15) level and a narrow linewidth below 1 Hz.

Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Metrology

Background:

  • Precise frequency control of lasers is crucial for advanced applications.
  • Fabry-Perot etalons are widely used for optical frequency stabilization.
  • Vibration isolation is essential for high-stability optical systems.

Purpose of the Study:

  • To independently stabilize a Nd:YAG laser to two separate Fabry-Perot etalons.
  • To characterize the relative frequency stability and linewidth of the stabilized laser system.
  • To demonstrate a new method for achieving ultra-high frequency stability.

Main Methods:

  • Utilizing a Nd:YAG laser operating at 1064 nm.
  • Employing two Fabry-Perot etalons for independent laser frequency stabilization.

Related Experiment Videos

  • Implementing separate vibration-isolation platforms for each etalon.
  • Performing heterodyne beat measurements for frequency analysis.

    • Main Results:

    • Achieved relative frequency stability at the part-in-10(15) level over 5 seconds.
    • Measured a relative linewidth of the laser system to be less than 1 Hz.
    • Demonstrated the effectiveness of independent stabilization to separate etalons.

    Conclusions:

    • The independent stabilization of a Nd:YAG laser to two Fabry-Perot etalons yields exceptional frequency stability.
    • The demonstrated stability and narrow linewidth are suitable for demanding metrology and fundamental physics experiments.
    • This technique offers a robust approach for developing next-generation optical frequency standards.