Common-path on-axis Fresnel holography based on a pinhole array plate.

Area of Science:

• Optics and Photonics
• Digital Imaging
• Holography

Background:

• Lensless Fresnel holographic imaging systems lack sufficient resolution power.
• Improving resolution is crucial for advanced imaging applications.

Purpose of the Study:

• To propose a common-path and on-axis configuration for enhancing lensless Fresnel holographic imaging resolution.
• To demonstrate direct extraction of object wave complex amplitude and increased numerical aperture.

Main Methods:

• Insertion of a pinhole array plate (PAP) between the object and recording plane.
• Utilizing the diffraction effect of the PAP to increase the numerical aperture.
• Directly extracting complex amplitude from a single Fresnel hologram.

Main Results:

• Successfully improved the resolution power of the lensless Fresnel holographic imaging system.
• Demonstrated direct extraction of the object wave's complex amplitude.
• Achieved an increased numerical aperture due to the pinhole array's diffraction.

Conclusions:

• The proposed configuration offers a viable method for enhancing lensless Fresnel holographic imaging.
• This approach has potential applications in digital holography across a wide spectrum, including far-infrared, X-ray, and electron beams.