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Related Concept Videos

Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

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Related Experiment Video

Updated: Jun 8, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

256 × 256 liquid-crystal-on-silicon spatial light modulator.

D J McKnight, K M Johnson, R A Serati

    Applied Optics
    |October 2, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a new liquid-crystal-on-silicon spatial light modulator (SLM) for optical correlators. The device offers a high frame rate and discusses design trade-offs for optimal performance.

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    Area of Science:

    • Optoelectronics
    • Materials Science

    Background:

    • Spatial light modulators (SLMs) are crucial components in optical systems.
    • Liquid-crystal-on-silicon (LCOS) technology offers a pathway for high-resolution SLM fabrication.

    Purpose of the Study:

    • To design and construct a 256x256 pixel LCOS-based SLM.
    • To evaluate the performance characteristics of the fabricated SLM.
    • To analyze design trade-offs influenced by its application in optical correlators.

    Main Methods:

    • Utilized liquid-crystal-on-silicon technology for SLM fabrication.
    • Characterized the SLM's optical performance, including contrast ratios.
    • Measured electronic load and liquid crystal switching times.

    Main Results:

    • Achieved a zero-order contrast ratio of 70:1 and an imaged contrast ratio of 10:1.
    • The SLM has a pixel pitch of 21.6 µm, resulting in an array size of 5.53 mm.
    • Demonstrated an electronic load time of 43 µs and a liquid crystal switching time of ~75-80 µs, enabling a maximum frame rate of ~8.3 kHz.

    Conclusions:

    • The developed LCOS SLM meets key performance metrics for optical applications.
    • Design choices were optimized considering the specific requirements of optical correlators.
    • The device represents a viable component for advanced optical processing systems.