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Ultra-compact optical zoom endoscope using solid tunable lenses.

Yongchao Zou, Fook Siong Chau, Guangya Zhou

    Optics Express
    |October 19, 2017
    PubMed
    Summary
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    This study introduces an ultra-compact optical zoom endoscope using tunable Alvarez lenses. This innovation enables continuous zoom and clear focus without scope movement, advancing medical and industrial imaging.

    Area of Science:

    • Optics and Photonics
    • Biomedical Engineering
    • Microscopy

    Background:

    • Traditional endoscopes often lack zoom capabilities or are bulky.
    • Achieving optical zoom in compact devices presents significant engineering challenges.

    Purpose of the Study:

    • To develop an ultra-compact optical zoom endoscope.
    • To demonstrate continuous optical zoom with autofocus in a small-diameter device.

    Main Methods:

    • Utilized two tunable Alvarez lenses controlled by piezoelectric benders.
    • Arranged benders circumferentially around the optics for a 2 mm diameter.
    • Achieved optical zoom by moving lenses perpendicular to the optical axis.

    Main Results:

    Related Experiment Videos

  • Demonstrated a continuous optical zoom of approximately 3x.
  • Achieved a field of view (FOV) change from 50° to 18°.
  • Required optical element movement was less than 110 μm.

    • Conclusions:

    • The ultra-compact optical zoom endoscope offers a novel solution for enhanced visualization.
    • Potential applications include minimally invasive healthcare procedures and detailed industrial inspections.