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Related Experiment Video

Updated: Jun 22, 2026

Lensless Fluorescent Microscopy on a Chip
11:23

Lensless Fluorescent Microscopy on a Chip

Published on: August 17, 2011

Microlensed microchip VECSEL.

Nicolas Laurand, C L Lee, E Gu

    Optics Express
    |June 24, 2009
    PubMed
    Summary
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    Researchers developed a novel microchip Vertical External Cavity Surface Emitting Laser (VECSEL) array using diamond microlenses. This design enables precise control over laser output, demonstrating fundamental mode emission with 70 mW power.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Semiconductor Lasers

    Background:

    • Microchip Vertical External Cavity Surface Emitting Lasers (VECSELs) offer compact and efficient laser solutions.
    • Effective heat management and precise optical feedback are critical for VECSEL array performance.

    Purpose of the Study:

    • To investigate a novel microchip VECSEL array design utilizing a microlens-patterned diamond.
    • To systematically study the influence of cavity properties on VECSEL performance.
    • To analyze transverse mode selection mechanisms in VECSEL arrays.

    Main Methods:

    • Fabrication of a 1.055-mum microchip VECSEL array with a diamond heatspreader and integrated microlens output mirrors.
    • Systematic variation of cavity properties (mode-matching, microlens aperture size) for identical semiconductor structures.

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  • Characterization of transverse mode selection and output power.

    • Main Results:

    • Demonstrated a VECSEL array configuration suitable for laser array operation.
    • Transverse mode selection was found to be dependent on mode-matching conditions and microlens aperture size.
    • Achieved single-device fundamental mode emission (M2~1.1) with 70 mW output power.

    Conclusions:

    • The microlens-patterned diamond serves effectively as both a heatspreader and an array of output mirrors.
    • The demonstrated VECSEL array design allows for controlled transverse mode selection.
    • This approach is promising for developing high-power, high-quality laser arrays.