Substrate calibration method of a computer-generated hologram based on ray propagation in a three-dimensional model

Area of Science:

• Optics and Photonics
• Metrology

Background:

• Substrate errors in computer-generated holograms (CGH) limit high-precision aspheric measurements.
• The propagation of these substrate errors remains ambiguous, despite partial correction via 0th-order calibration.

Purpose of the Study:

• To resolve the ambiguity in substrate error propagation in CGH.
• To elucidate the modulation process of CGH substrate error on the transmitted wavefront.

Main Methods:

• Established a ray propagation model in three dimensions.
• Analyzed the modulation of transmitted wavefront by CGH substrate error.

Main Results:

• Successfully modeled the propagation of CGH substrate errors.
• Demonstrated the modulation process of substrate errors on the transmitted wavefront.
• Achieved accurate analysis of substrate error propagation.

Conclusions:

• The 3D ray propagation model accurately analyzes CGH substrate error propagation.
• Application of this method significantly improves CGH design efficiency.
• Enables higher precision in aspheric measurements using CGH.