Research on high-quality imaging holographic lenses for zoom systems

Abstract

This paper reports the development of a high-imaging-quality holographic lens for potential integration into compact zoom systems. The work focuses on fabrication-process optimization, image-distortion correction, performance testing, and imaging-quality improvement. A transmission holographic recording scheme based on a spatial light modulator (SLM) and a 4F filtering system was employed to encode the wavefront of a designed lens into a photopolymer film. By optimizing the object-to-reference beam intensity ratio and the recording angle, the diffraction efficiency was increased to 64%. To address wavefront distortion caused by polymerization shrinkage, Bragg detuning, SLM pixelation, and residual aberrations of the 4F relay optics, an iterative Zernike-polynomial pre-compensation strategy was introduced. After three iterations, the structural similarity index measure improved from 0.56 to 0.73 and the average gradient increased from 2.41 to 2.92. The proposed approach provides a practical route for improving the imaging performance of photopolymer-based holographic optical elements and supports their integration into compact zoom systems. Additional experiments further demonstrated focal-plane selectivity and a usable full field of view of 87.4°.