ABSTRACT
A scanning full-field interferometer is a key device in the optical scheme of digital hyperspectral hologram registration. Behind the theory of hyperspectral holography is Fourier transform spectroscopy, wherein the set of spectrally resolved complex amplitudes of the object's hyperspectral field is obtained via the Fourier transform of a series of interferograms registered in incoherent radiation. Several established approaches in digital holography, based on discrete phase-shifting techniques as well as continuous phase modulation of the reference signal by a scanning mirror, are special cases of Fourier transform spectroscopy, where a coherent light source is used for hologram registration. The proposed algorithm was found to apply to processing holograms registered by various phase-shifting techniques and can give a greater signal-to-noise ratio.
ABSTRACT
Self-reference hyperspectral holographic microscopy with an extended, spatially incoherent, polychromatic source is suggested and experimentally verified. The reference field is the zero-order Fourier component of the object filtered out by a ring-shaped mask placed in the Fourier plane of the optical system. A set of spectrally resolved complex amplitudes of the object is obtained on the basis of a standard microscope equipped with a Michelson interferometer. Experiments on registration of hyperspectral holograms confirming the validity of the proposed theoretical model are carried out.
