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Updated: Mar 19, 2026

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

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Inline dual-phase modulation method for a compact lensless holographic display.

Jianglian Wang, Atsushi Okamoto, Yuta Goto

|March 17, 2026

Summary

This summary is machine-generated.

This study introduces a compact holographic display using a single spatial light modulator (SLM) and a novel dual-phase modulation technique. This method achieves high-precision image reconstruction with reduced speckle noise for advanced display applications.

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Area of Science:

Optics and Photonics
Display Technology
Holography

Background:

Traditional holographic displays often require bulky optical systems.
Achieving high-quality holographic reconstruction with compact setups remains a challenge.

Purpose of the Study:

To develop a compact lensless holographic display system.
To introduce an innovative inline dual-phase modulation technique for holographic displays.

Main Methods:

Utilized a single spatial light modulator (SLM) with two-phase components from double-phase holography.
Employed superposition of a digital phase grating for holographic display.
Incorporated an initial random phase to reduce artifacts and speckle noise.

Main Results:

Achieved a compact optical setup by eliminating the need for bulky 4-F systems.
Demonstrated high-precision image reconstruction with minimal speckle noise.
Expanded display area using a beam splitter while maintaining system compactness.

Conclusions:

The proposed dual-phase modulation technique offers a simplified and compact solution for holographic displays.
This method is applicable to various holographic display systems, including projection, near-eye, and 3D displays.
The technique effectively reduces speckle noise compared to conventional methods.