Large field digital holography by wavelength division multiplexing using Kramers–Kronig relations

While digital holographic imaging can record both light intensity and phase information, its photodetector resolution lags behind that of optical dry plates, often resulting in a compromise between resolution and field of view. To overcome this limitation, we present an imaging method that combines Kramers–Kronig relations with wavelength division multiplexing, enabling large-field digital holographic imaging without sacrificing resolution. We validate the effectiveness of this method through simulation and example experiment, and demonstrate successful expansion of the field of view by 3 times with three color lasers, while improving the resolution.