Computer simulation of the interferometer combining properties of low-sensitive Talbot interferometer and high-sensitive holographic interferometer is considered. The interferometer has four output channels having different sensibility. Channel sensibility can be varied by means of space filtration. Wide range of the interferometer sensibility allows using the interferometer for investigation of complex phase objects. The base of the interferometer is the holographic Talbot effect found by authors.
The basic object of the computer simulation is to find the method of decoding of complex interferometric patterns produced by the interferometer. Some results of the computer simulation are presented in report. The obtained results were compared with results obtained in optical experiments under the same conditions.
This report, considers a hologram which possesses properties of Gabor’s, Leiht’s Denisyuk’s and Benton’s holograms as well as other new ones. These new properties and peculiarities of the hologram may be used in a Optical security, as a unique security device on security documents, such as, e.g., identification cards, passports, credit cards, and other documents where a high degree of security is needed. One may more increase a degree of security by means of a few manipulation in the recording scheme.
The interferometer combining the best characteristics of the Talbot interferometer and holographic one is considered by this paper. The base of the interferometer is the holographic Talbot effect. As distinct from the ordinary Talbot interferometer holographic one uses instead of a second grating a photographic plate. The object is a combination of the grating and the initial phase object. The hologram is reconstructed simultaneously by the wave passed through a distorted phase object and reference wave. Four waves appear behind the hologram. This scheme may be considered as an interferometer having four output channels with different sensibility. The scheme of the Talbot holographic interferometer was simulated on a computer. The model allowed to research in detail the interferometer operation under different conditions of the hologram recording and with different phase objects.
The paper consider a development of the slitless method of a rainbow holography to the method of generalized holography. The slitless method of a rainbow holography was suggested by the first author in this previous papers.
Fundamental properties and particularities ofthe Gabor's,Leith-Upatnieks's and Denisjuk's holograms are well . TheBenton's rainbow hologram excites great interest .Benton's rainbow holography is a two-step process of hologramrecording where a narrow aperture slit is introduced into the second stage.One-step schemes for rainbow holography (RH) were proposed later on. A narrow aperture slit restricting object wave is an inherent component ofthe existing schemes of one- and two-step recording schemes. The aperture slit in RI-I recording schemes is the main disadvantage of RH method because it increases exposures 1 00 tol 000 times and prevents applications ofthis method in real time interferometry.. The united hologram uniting the Gabor's, Leith-Upatniecs's and Benton's holograms in one is considering in this report. This is the slitless method of RH recording. The report summarizes slitless one- and two-step methods ofRH recording. The narrow aperture slit is excluded in the slitless method of RI-I recording through application of the second reference wave coaxial with the object one. As a result, three holograms are being recorded simultaneously on a photographic plate: an axial Gabor's hologram, an off-axial Fresnel's hologram and a regular holographic grating (RHG), moreover, the off-axis and RHG possess the same spatial frequency. Existence of a RHG in a hologram is the cause of new features: object image is reconstructed in rainbow colours when such a hologram is illuminated with white light ;when it is illuminated with laser light a number of new object images. The report also shows the common physical nature of the phenomena that seems at first rather distant from each other: of rainbow holography and the Talbot effect in holography, and it proposes a theory of slitless RH and of the Talbot effect in holography developed from a unified point of view.
The one and two-step slitless methods are considering for rainbow hologram recording. The theory of the slitless rainbow holography and the Talbot effect in holography was developed on the basis of the Generalized Scheme for recording of rainbow holograms. The modulation theory and the Fourier analysis of optical signals was applicated by creation of this theory.
The paper discloses applications of the slitless rainbow holography in holographic real time interferometry. It demonstrates that this method of the slitless rainbow holography permits the user to design a holographic real time interferometer with four channels having a broad range of sensitivities.
The paper describes a theory of the slitless rainbow holography and the Talbot effect in holography that was developed on the basis of the generalized scheme for recording of rainbow holograms and with application of the modulation theory and the Fourier analysis of optical signals.