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Updated: May 24, 2026

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
09:10

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Narrow linewidth tunable external cavity diode laser using wide bandwidth filter.

Daniel J Thompson1, Robert E Scholten

  • 1ARC Centre of Excellence for Coherent X-ray Science, School of Physics, The University of Melbourne, 3010, Australia.

The Review of Scientific Instruments
|March 3, 2012
PubMed
Summary
This summary is machine-generated.

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We developed a stable external cavity diode laser (ECDL) using an interference filter and cateye reflector. This design achieves narrow linewidths and broad tunability, outperforming traditional Littrow ECDL configurations.

Area of Science:

  • Optics and Photonics
  • Laser Physics

Background:

  • External cavity diode lasers (ECDLs) are crucial for applications requiring tunable, narrow-linewidth light sources.
  • Traditional ECDL designs, such as the Littrow configuration using diffraction gratings, often suffer from mechanical instability and limited tunability.

Purpose of the Study:

  • To demonstrate a novel ECDL design utilizing an interference filter for mode selection and a cateye reflector for enhanced feedback.
  • To investigate the performance of this new design in terms of single-mode operation, linewidth, tunability, and mechanical stability.

Main Methods:

  • An external cavity diode laser was constructed incorporating an interference filter with a multimode bandwidth for effective mode selection.
  • A cateye reflector was employed to maximize optical feedback efficiency and minimize sensitivity to intra-cavity misalignment.

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  • Frequency noise spectra were measured and compared to a standard Littrow ECDL configuration.

    • Main Results:

    • Single-mode operation was successfully achieved using the interference filter.
    • Narrow spectral linewidths of 26 kHz were observed.
    • The laser demonstrated a tuning range of 14 nm using a single 785 nm filter, with no change in output beam direction.
    • The cateye reflector and filter facilitated a mechanically rigid design, exhibiting reduced susceptibility to mechanical resonances compared to a Littrow ECDL.

    Conclusions:

    • The demonstrated ECDL design offers a robust and stable alternative to conventional configurations.
    • The use of an interference filter and cateye reflector provides a compact, tunable, and narrow-linewidth laser source with improved mechanical stability.