Abstract
Interferenceless coded aperture correlation holography (I-COACH) is a non-scanning, motionless, incoherent digital holography technique. In this study we use a special type of I-COACH in which its point spread hologram (PSH) is ensemble of sparse dots. With this PSH an imaging resolution beyond the classic diffraction limit is demonstrated. This resolution improvement is achieved due to the position of the coded aperture between the object and the lens-based imaging system. The coded aperture scatters part of the light, that otherwise is blocked by the system aperture, into the optical system, and by doing that, extends the effective numerical aperture of the system. The use of sparse PSH increases the signal-to-noise ratio of the entire imaging system. A lateral resolution enhancement by a factor of about 1.6 was noted in the case of I-COACH compared to direct imaging.
Highlights
Interferenceless coded aperture correlation holography (I-COACH) is a non-scanning, motionless, incoherent digital holography technique
In channel 1, a pinhole of size 25 μm is used to record the point spread hologram (PSH) on the camera plane, whereas in channel 2, elements 1–6 in Group 3 of United States Air Force (USAF) resolution transmission target were used as the object
We have demonstrated a new technique for achieving a resolution beyond the diffraction limit in a modified I-COACH system, by enhancing the effective numerical aperture (NA) and introducing sparsity into the system point response
Summary
Interferenceless coded aperture correlation holography (I-COACH) is a non-scanning, motionless, incoherent digital holography technique. In this study we use a special type of I-COACH in which its point spread hologram (PSH) is ensemble of sparse dots With this PSH an imaging resolution beyond the classic diffraction limit is demonstrated. The entire resolution improvement techniques can be roughly sorted to those that improve the image resolution with the same amount of object information, in contrast to those methods that increase the amount of information introduced into the system with the same physical aperture. Object information in this context means the spatial spectrum of the object’s image. Due to the lack of two wave interference in the I-COACH holography, the optical configurations and calibrations are simpler in comparison to traditional holographic systems
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