Usually, a hologram cannot be changed after recording. Scientists at the University of Tartu have found a solution to this.
Their new method records multiple holograms with different focuses. A computer later combines these into one sharp image.
This method makes the image sharp over a larger area than before. This helps to see, for example, cells better.
The method is called PEAR-FINCH. It is better than old methods.
Why is this method special? It allows adjusting the sharpness of the image after recording. Also, the details of the image are not lost due to noise.
The new method is five times more precise than the old one. It clearly shows thicker tissues without moving the microscope.
The method also works with poor lighting. This is important for biological samples.
Scientists say this is a new step in hologram imaging. It is better than old methods.
The new method takes more time. It takes three times more images than the usual method.
The experiment showed that the new method produces sharper images than old methods. For example, objects 12 mm away remained blurry with old methods.
The study results were published in a scientific journal.