Optical micro displacement sensor using a composite cavity laser diode integrated with a microlens

Jun Ichi Shimada, Yoshitada Katagiri, Osamu Ohguchi, Renshi Sawada

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    We demonstrated an extremely small optical displacement sensor using a laser diode integrated with a microlens and based on the composite cavity principle, which is that the light output power from the laser diode changes with reflectance and displacement of the third mirror. The light output power from the device was modulated by the reflectance of the third mirror with the displacement in the lateral direction. The modulation depth was 0.1 when the third mirror reflectances were 70% and 4%, and the resolution in the lateral direction was 3 μm. The light output power was also modulated by the third mirror displacement in the axial direction with a period of 0.4 mu m, and a modulation depth of 0.047 was obtained.

    Original languageEnglish
    Pages (from-to)140-146
    Number of pages7
    JournalJournal of Micromechanics and Microengineering
    Volume4
    Issue number3
    DOIs
    Publication statusPublished - Sep 1994

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Mechanics of Materials
    • Mechanical Engineering
    • Electrical and Electronic Engineering

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