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

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.