Transverse translation diverse phase retrieval using soft-edged illumination

Area of Science:

• Optical Engineering
• Metrology
• Wavefront Sensing

Background:

• Ptychographic imaging techniques offer high accuracy for optical testing.
• Transverse translation diverse phase retrieval (TTDPR) is a promising wavefront-sensing method.
• Diffraction effects can soften illumination edges in reflective optic measurements, potentially impacting accuracy.

Purpose of the Study:

• To quantitatively assess the wavefront-sensing accuracy of TTDPR.
• To investigate the impact of soft-edged translating illumination on TTDPR performance.
• To determine the viability of TTDPR for reflective optic testing under realistic diffraction conditions.

Main Methods:

• Utilized ptychographic image-based wavefront sensing.
• Employed transverse translation diverse phase retrieval (TTDPR).
• Simulated and analyzed the effects of soft-edged illumination caused by diffraction.

Main Results:

• Wavefront-sensing accuracy of TTDPR was quantitatively explored.
• The study identified the influence of soft-edged illumination on fine structure suppression in TTDPR data.
• The research provides insights into TTDPR's performance limitations and capabilities.

Conclusions:

• TTDPR is a viable technique for optical shop testing.
• Soft-edged illumination, a result of diffraction, can affect TTDPR accuracy.
• Further research is needed to optimize TTDPR for reflective optics with diffraction effects.