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Interferometric testing for off-axis aspherical mirrors with computer-generated holograms.

Masaru Kino¹, Mikio Kurita

¹Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan. kino@z.phys.nagoya-u.ac.jp

|July 10, 2012

Summary

This study enhances computer-generated hologram (CGH) interferometers for measuring off-axis aspherical mirrors. The improved method achieves high lateral resolution, crucial for large telescope mirror fabrication.

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Area of Science:

Optical engineering
Interferometry
Holography

Background:

Conventional computer-generated hologram (CGH) interferometers struggle with lateral resolution for off-axis aspherical mirrors due to diffraction blur and distortion.
Nonzero order diffraction from CGHs limits interferogram quality in existing setups.

Purpose of the Study:

To improve the lateral resolution of interferograms generated by CGH interferometers.
To adapt CGH applications within interferometers for enhanced measurement capabilities.

Main Methods:

Modified the application of CGHs in interferometers so the returned test beam utilizes zeroth-order diffraction.
Applied the developed CGH interferometer to measure the primary mirror of the Okayama Astrophysical Observatory 3.8 m telescope project.

Main Results:

Achieved a high-resolution interferogram with 2.8 mm lateral resolution for a 1.2 m off-axis aspherical mirror.
Successfully demonstrated a high lateral resolution interferometer through improved CGH usage.

Conclusions:

The modified CGH interferometer design significantly enhances lateral resolution for off-axis aspherical mirror measurements.
This advancement is critical for the precise fabrication of large astronomical optics, such as telescope primary mirrors.