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Diode laser with 1 Hz linewidth.

H Stoehr1, F Mensing, J Helmcke

  • 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany.

Optics Letters
|March 21, 2006
PubMed
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We developed an ultranarrow-linewidth laser spectrometer for precise measurements. This system achieves a linewidth below 1.5 Hz and fractional instability under 2 x 10(-15), advancing laser spectroscopy technology.

Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Laser Spectroscopy
  • Metrology

Background:

  • High-precision laser systems are crucial for fundamental physics research and advanced metrology.
  • Achieving ultranarrow linewidths and high stability in laser sources presents significant technical challenges.

Purpose of the Study:

  • To develop and characterize an ultranarrow-linewidth laser spectrometer at 657 nm.
  • To demonstrate a stable, single-stage locked diode laser system for high-precision spectroscopy.

Main Methods:

  • A diode laser was locked in a single stage to a high-finesse reference cavity.
  • The laser spectrometer's performance was validated by comparison with an independent, second laser system.
  • Beat frequency measurements were employed to determine the laser linewidth and instability.

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Main Results:

  • An ultranarrow laser linewidth below 1.5 Hz (Full Width at Half Maximum) was achieved.
  • A fractional frequency instability of less than 2 x 10(-15) was observed for a 1-second averaging time.
  • The system demonstrated robust performance through comparison with an independent setup.

Conclusions:

  • The developed laser spectrometer meets stringent requirements for high-precision measurements.
  • The single-stage locking technique to a high-finesse cavity is effective for generating ultranarrow linewidth lasers.
  • This system advances the capabilities for applications demanding exceptional laser frequency stability and narrow linewidths.