Usually, a hologram cannot be changed after it has been recorded. Researchers at the University of Tartu have found a solution to this.
Their method makes holograms sharper. The method records multiple holograms with different focuses. A computer combines them into one image.
This method makes the image sharp over a larger area than before. This helps to see cells better, for example.
The method is called PEAR-FINCH. PEAR-FINCH is better than old methods. It makes the image sharp after recording.
The new method also works with poor lighting. This is important for biological samples.
The new method takes more time. It takes three times more images than the conventional method.
The experiment showed that the new method produces sharper images than the old methods.