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Area of Science:

Optical metrology
Interferometry
Aspheric optics testing

Background:

Pinhole point diffraction interferometers (PPDI) offer advantages in testing aspheric mirrors due to their simple optical setup and reduced error sources.
Expanding the measuring aperture of PPDIs is crucial for characterizing larger and more complex aspheric surfaces.

Purpose of the Study:

To develop and demonstrate a phase-shifting method for enhancing the measuring aperture of a pinhole point diffraction interferometer.
To enable precise phase map acquisition for aspheric mirror testing.

Main Methods:

A phase-shifting technique utilizing a random two-frame algorithm was implemented.
A piezoelectric transducer (PZT) precisely moved the pinhole along the aspheric mirror's axis in discrete steps.
A CCD camera captured interferograms at each step, which were then processed to obtain the phase map.

Main Results:

The developed phase-shifting method successfully acquired phase maps of the aspheric mirror.
The technique demonstrated potential for increasing the effective measuring aperture of the PPDI.

Conclusions:

The reported phase-shifting method effectively expands the measurement capability of PPDIs for aspheric optics.
This approach maintains the inherent advantages of PPDI, such as minimal optical components and fewer error sources.