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Related Experiment Video

Updated: Jun 7, 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

External-cavity diode lasers with different devices and collimating optics.

D M Kane, A P Willis

    Applied Optics
    |November 6, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study compares external-cavity diode lasers (ECDLs) using different internal devices and collimating lenses. Results show lens choice significantly impacts beam profile and laser performance, with a new method for analyzing multi-quantum-well (MQW) devices presented.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Laser Engineering

    Background:

    • External-cavity diode lasers (ECDLs) are crucial for tunable laser applications.
    • Understanding the impact of internal device architecture and optical components is vital for optimizing ECDL performance.
    • Channel substrate planar (CSP) and multi-quantum-well (MQW) devices represent distinct internal laser diode designs.

    Purpose of the Study:

    • To comparatively analyze the operating characteristics of ECDLs incorporating CSP and MQW devices.
    • To investigate the influence of different collimating lenses (multielement vs. graded index) on ECDL performance metrics.
    • To introduce and demonstrate a novel method for quantifying key parameters in MQW devices within an ECDL configuration.

    Main Methods:

    • Fabrication and characterization of ECDLs with both CSP and MQW internal laser diodes.
    • Evaluation of output beam profiles using multielement and graded index collimating lenses.
    • Measurement of power-current characteristics, optical frequency spectra, and radio frequency (RF) spectra.
    • Determination of coherence lengths for various laser diode-collimating lens combinations.
    • Development and application of a new method to calculate coupling coefficient, internal quantum efficiency, and internal lumped loss for MQW devices.

    Main Results:

    • Significant alterations in output beam profiles were observed based on the choice of collimating lens.
    • Power-current characteristics, optical frequency, and RF spectra varied between CSP and MQW devices and with different lenses.
    • Coherence lengths were measured for all tested ECDL configurations.
    • The new method successfully calculated coupling coefficient, internal quantum efficiency, and internal lumped loss for the MQW device.

    Conclusions:

    • The selection of collimating lens is a critical factor in defining the beam quality and overall performance of ECDLs.
    • MQW devices offer distinct characteristics compared to CSP devices within ECDLs.
    • The developed method provides a valuable tool for the detailed analysis and optimization of MQW-based ECDLs.