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An alternator converts mechanical energy into electrical energy that varies sinusoidally, resulting in AC current. Meanwhile, a DC generator converts mechanical energy into electrical energy, which are DC pulses with the same polarity. The construction of a DC generator is similar to that of an alternator, except that the pair of slip rings is replaced by a single split ring, also called a commutator. The commutator functions like a periodic rotary switch; it changes the contacts with the...
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Related Experiment Video

Updated: Feb 7, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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DC-free on-axis holographic display using a phase-only spatial light modulator.

Jaebum Cho, Soobin Kim, Shinwoong Park

    Optics Letters
    |July 14, 2018
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    Summary
    This summary is machine-generated.

    A novel holographic display eliminates DC noise using a phase-only spatial light modulator (SLM) and a new algorithm. This method improves holographic image quality through optimized filtering and iterative Fourier transforms.

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    Area of Science:

    • Optics and Photonics
    • Holography
    • Image Processing

    Background:

    • On-axis holographic displays using phase-only spatial light modulators (SLMs) suffer from direct current (DC) noise.
    • DC noise degrades the quality and fidelity of reconstructed holographic images.
    • Existing methods for DC noise reduction in holographic displays are insufficient.

    Purpose of the Study:

    • To propose a DC-noise-free holographic display scheme.
    • To analyze the origin of DC noise in phase-only SLM-based holographic displays.
    • To develop an optimized DC noise rejection filter and a novel algorithm for computer-generated hologram synthesis.

    Main Methods:

    • Analysis of DC noise sources in on-axis holographic displays.
    • Design and optimization of a DC noise rejection filter for phase-only SLMs.
    • Development of a two-step iterative Fourier transform algorithm for phase-only computer-generated hologram synthesis.
    • Validation through numerical simulations and experimental setups.

    Main Results:

    • Successful implementation of a DC-noise-free holographic display scheme.
    • Demonstration of an optimized DC noise rejection filter.
    • Validation of the novel two-step iterative Fourier transform algorithm.
    • Significant improvement in holographic image quality compared to conventional methods.

    Conclusions:

    • The proposed scheme effectively eliminates DC noise in on-axis holographic displays.
    • The developed algorithm enables optimal synthesis of phase-only computer-generated holograms.
    • This work advances the field of holographic display technology by improving image fidelity.