Axial intensity distribution analysis for a depth-of-field-extended optical system using a low-frequency binary phase...

Area of Science:

• Optics
• Optical Imaging
• Phase Contrast Microscopy

Background:

• Extending the depth of field is crucial for optical imaging systems.
• Existing methods for depth of field extension can be complex or require digital processing.

Purpose of the Study:

• To theoretically analyze and design a novel, simple phase mask for extending the depth of field.
• To compare the performance of the novel phase mask with a previously developed one.

Main Methods:

• Theoretical analysis of axial intensity distribution.
• Design of a one-step low-frequency binary phase mask.
• Numerical testing in an achromatic doublet system.

Main Results:

• The novel one-step phase mask effectively extends the depth of field.
• Performance is comparable to a two-step phase mask from previous research.
• The novel mask features a simpler structure, facilitating easier fabrication.

Conclusions:

• A novel, simple, one-step phase mask is presented for depth of field extension.
• The proposed mask offers a cost-effective alternative to existing technologies.
• This provides a new option for designing depth-of-field-extended optical systems without digital image processing.