Self-interference holographic imaging system based on a birefringent crystal lens
[Objective]This study aims to explore the use of self-interference holographic imaging technology to obtain holographic images of real-world objects,address safety concerns associated with laser illumination in traditional holographic imaging techniques,and improve imaging efficiency and quality.We address the problem of optical path difference compensation using a single α-BB birefringent crystal lens as a wavefront splitter and phase compensation device.We validate the feasibility of this approach in achieving fast three-dimensional imaging and assess its potential in capturing holographic images of complex objects and achieving three-dimensional imaging of everyday objects.[Methods]The self-interference holographic imaging system described in this paper employs a birefringent crystal lens for spectral splitting and uses a polarization camera with embedded micropolarization arrays to capture images,enabling image acquisition through a single exposure.To achieve higher imaging quality,relevant parameters of the imaging system are theoretically derived.In terms of optical path design,optical path compensation is achieved through a half-silvered mirror,a quarter-wave plate,mirrors,and a crystal lens to ensure that the optical paths for ordinary(o)and extraordinary(e)light are less than the coherence length,thus obtaining interference patterns.The feasibility of this method is experimentally verified.During the experiment,LED light sources are used for illumination,images are captured using a polarization camera,and the acquired holographic images are processed using image reconstruction algorithms to obtain final reconstructed images.[Results]The innovation of this study lies in proposing a method for rapid three-dimensional imaging using self-interference holographic imaging technology and addressing the problem of optical path difference compensation using a single α-BBO birefringent crystal lens,thus avoiding the complexity and limitations associated with requiring additional compensation planes in traditional methods.Additionally,the study optimized the optical path design of the imaging system,suggesting the use of concave mirrors to achieve a more flexible system configuration,thereby further enhancing the performance and applicability of the imaging system.[Conclusions]This study demonstrates the feasibility of a self-interference holographic imaging system utilizing an α-BBO crystal lens for spectral separation,autonomous compensation of optical path differences,and single-shot imaging facilitated by a polarization camera.Moreover,the feasibility of the system in expedited three-dimensional imaging is validated.This technology not only enables real-time three-dimensional imaging of transparent live cells in the biomedical field but also facilitates morphology and curvature measurements of phase objects and defect detection in industrial inspection.In the realm of virtual and augmented reality,the development of self-interference digital holography opens up new possibilities for capturing more realistic and vivid images and videos from the real world.Furthermore,it serves as a reference and foundation for further improving holographic imaging techniques and enhancing imaging quality and efficiency.Future research can further explore the application potential of this technology in capturing holographic images of complex objects,achieving three-dimensional imaging of everyday objects,and further optimizing the design and performance of imaging systems to meet broader application requirements.
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