Investigation On Adaptive Wavefront Sensing And Correction In Incoherent Digital Holography

Fresnel incoherent correlation holography(FINCH)is a non-scanning three-dimensional imaging technology.In FINCH,the light source is spatially incoherent,so the light emitted from any two points of the object is incoherent.However,the spatial self-coherence can be achieved by two beams that originated from the same object point.The hologram of a point source can be achieved by splitting the light from the point source into two beams.The hologram of whole object is the incoherent superposition of all the points holograms.Depending on the type of hologram,the reconstruction of the hologram can be achieved by an appropriate algorithm.Incoherent digital holography technology has received extensive attention and research in the imaging field.In biological imaging experiments,the unevenness of refractive index caused by sample structures,unevenness of sample surface and the characteristics of the submersion medium cause optical aberrations.Aberrations reduce the imaging quality and imaging resolution of the reconstructed image of the system.To solve this problem,adaptive optics has been adopted in many fields.Wavefront sensor is uesed to detect wavefront aberrations and wavefront corrector is uesed to correct the aberrations.Imaging resolution and imaging quality of the system can be obviously improved.This paper focuses on the application of adaptive optics technology to two incoherent digital holographic systems,Fresnel incoherent correlated holographic systems and triangular digital holographic systems.In order to improve the imaging resolution and imaging quality of hologram reconstructed images,adaptive optics is used.The basic principles of incoherent digital holographic imaging is demonstrated for adaptive optics aberrations correction.Combined with the characteristics of incoherent digital holography,the image-based adaptive optics is introduced to achieve adaptive wavefront detection and correction.The application characteristics of adaptive optics in incoherent digital holography are studied.An incoherent holographic experiment system is established.Image-based adaptive optics is combined with two incoherent digital holographic imaging systems: 1)Image-based adaptive optics is combined with FINCH system,using spatial light modulator to introduce phase mask to correct aberration;2)Combined with triangular digital holographic systems,modulator-free computational adaptive optics is used to remove aberration in frequency domain.Experimental studies are performed on two adaptive optics imaging schemes,and the imaging characteristics of each scheme are clarified.The results show that image-based adaptive optics can effectively detect and correct the wavefront aberrations in the incoherent digital holography with less data,and improve the quality and imaging resolution of the reconstructed image of the system.