External-cavity diode lasers with different devices and collimating optics

D. M. Kane, A. P. Willis

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)


    Comparative operating characteristics of external-cavity diode lasers (ECDL’s) with either a channel substrate planar device or a multi-quantum-well (MQW) device are presented. These include the output beam profile, which is significantly altered depending on the collimating lens used (either multielement or graded index), power versus injection-current characteristics, and the optical frequency and the rf spectra. The coherence lengths of the different laser diode–collimating-lens combinations in the ECDL are measured, and a new method for calculating the coupling coefficient and the coupled values of the internal quantum efficiency and the internal lumped loss is demonstrated for the MQW device.

    Original languageEnglish
    Pages (from-to)4316-4325
    Number of pages10
    JournalApplied Optics
    Issue number21
    Publication statusPublished - 1995


    • Collimating lens
    • Coupling coefficient
    • External-cavity diode laser


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