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Compact, filtered diode laser system for precision spectroscopy.

Jaroslaw Labaziewicz1, Philip Richerme, Kenneth R Brown

  • 1Center for Ultracold Atoms, Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA. labaziew@mit.edu

Optics Letters
|March 30, 2007
PubMed
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We developed a compact laser system using optical feedback for stable, narrow-linewidth light sources. This system successfully cooled a single strontium ion to 2 mK for atomic physics research.

Area of Science:

  • Atomic Physics
  • Laser Spectroscopy
  • Quantum Optics

Background:

  • Stable, narrow-linewidth optical sources are crucial for modern atomic physics applications.
  • Optical feedback is a promising technique for achieving high frequency stability (~10 kHz).

Purpose of the Study:

  • To design and implement a compact external cavity diode laser system with optical feedback.
  • To achieve stable laser light at wavelengths relevant to strontium ion (Sr+) spectroscopy.

Main Methods:

  • A compact external cavity diode laser design incorporating optical feedback to a filter cavity.
  • Mounting components on a single baseplate within a vacuum-sealed box for stability.
  • Implementation for three specific wavelengths: 422 nm (cooling), 1091 nm (repumping), and 674 nm (clock transition).

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Main Results:

  • The laser system demonstrated stable operation at the target wavelengths for Sr+.
  • A single, trapped strontium ion was successfully cooled to approximately 2 mK.
  • Motional sidebands of the 5S(1/2) <--> 4D(5/2) transition in Sr+ were observed.

Conclusions:

  • The compact optical feedback laser system is effective for cooling strontium ions to millikelvin temperatures.
  • This system provides a stable, narrow-linewidth source suitable for precision atomic physics experiments.
  • The observed motional sidebands validate the laser's performance for probing atomic transitions.