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On-chip patterned light source that superimposes multiple patterns for speckle reduction.

Yoshitaka Kurosaka, Yutaka Takagi, Akio Ito

|June 11, 2026

Summary

This summary is machine-generated.

Researchers created a novel on-chip patterned light source. This device successfully superimposes four beam patterns with reduced speckle contrast, advancing optical technology.

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Area of Science:

Optics and Photonics
Microfabrication

Background:

Developing integrated optical systems requires precise control over light emission.
On-chip light sources are crucial for miniaturized optical devices.

Purpose of the Study:

To design and demonstrate an on-chip patterned light source capable of superimposing multiple beam patterns.
To evaluate the performance and image quality of the superimposed beams.

Main Methods:

Fabrication of an 800 micrometer square chip with four elementary pattern areas.
Emission pattern analysis in the far-field region for individual and combined elementary pattern areas.
Comparison of far-field patterns to assess superposition quality and speckle contrast.

Main Results:

Successful superposition of four elemental images from each elementary pattern area without blurring.
Demonstration of a unique center axis emission for all pattern areas.
Significant reduction in speckle contrast achieved in the superimposed pattern.

Conclusions:

The developed on-chip patterned light source effectively superimposes multiple beam patterns.
The device shows potential for applications requiring high-quality, superimposed light fields with reduced speckle.
The compact design and successful performance highlight advancements in integrated optics.