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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Efficient multilevel phase holograms for CO(2) lasers.

E Hasman, N Davidson, A A Friesem

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    Summary
    This summary is machine-generated.

    Multilevel phase holograms achieve high diffraction efficiencies near 90% for infrared radiation. This study examines how fabrication errors in surface relief gratings affect hologram performance.

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    Area of Science:

    • Optics and Photonics
    • Holography
    • Diffractive Optics

    Background:

    • Multilevel phase holograms are crucial for manipulating light.
    • Surface relief gratings offer a method for fabricating holographic elements.
    • Monochromatic radiation, particularly at 10.6 micrometers, is used in various applications.

    Purpose of the Study:

    • To investigate the fabrication of multilevel phase holograms using surface relief gratings.
    • To achieve high diffraction efficiencies for transmissive and reflective holographic elements.
    • To analyze the impact of fabrication errors on hologram efficiency.

    Main Methods:

    • Recording multilevel phase holograms as surface relief gratings with discrete binary steps.
    • Experimental evaluation of diffraction efficiencies for transmissive and reflective elements.
    • Theoretical consideration of efficiency reduction caused by step-level errors.

    Main Results:

    • Achieved diffraction efficiencies close to 90% for both transmissive and reflective holographic elements.
    • Demonstrated the feasibility of using binary step multilevel gratings for high-efficiency holograms.
    • Quantified the reduction in efficiency due to errors in step depth and width.

    Conclusions:

    • Multilevel phase holograms recorded as surface relief gratings can achieve high diffraction efficiencies.
    • Fabrication precision of step levels is critical for optimal hologram performance.
    • The study provides insights into the design and fabrication of efficient diffractive optical elements.