Rainbow Raster Holograpy Recording Method
Amplitude-type hologram recording the diffraction efficiency than the phase-type hologram is much lower, so the recording medium is generally used.
Amplitude-type one step hologram recording the diffraction records iimages onto photoresist.
Color film preservation
Preservation of color film can be said that the above process in a "reverse use." Color film of the original black and white film is difficult to dye relatively long time to save, you can use this step rainbow holography, holographic film in black and white to save Dover also into the original color film. This method does not depend on the diffraction of light by pigment saved, it is actually in accordance with the principles of the color rainbow holographic storage in white being.
Hologram sticker is made by one step holography lab with hologram len optics
Color film preservation shortcomings: difficult to implement and use, reduction difficult, making it difficult to re-color restoration without bias color, and shall use three lasers, high cost, there is dispersion noise. With digital photography filmless technology and some image processing software applications, holographic color film preservation method has been applied as a better way.
Hologram sticker is made by one step holography lab with hologram len optical tabel, optic, laser
Rainbow holographic interferometry
Holographic interferometry ordinary reproduction process required a coherent light source and generates speckle or coherent noise; rainbow holographic interferometry available white reproduction, speckle noise is low, contrasting high.
Reproduction based on multi-tiered step angle rainbow hologram
Holographic sticker is made by one step holography lab with hologram len optical tabel, optic, laser
Dr. Benton since first proposed two-step rainbow holography has been to overcome the two-step rainbow hologram is recorded twice tedious operation and other defects, such as Chan, Chinese Americans took advantage of the holographic image, step rainbow holography. In recent years, the progress of work in this area is mainly to expand the field of view, but in the operation has brought some trouble. About the rainbow holographic image quality and a cheap for discussing improved technology has also recently published a lot of valuable papers. Currently rainbow holography in white light holography.
One step holograhy recording
This section presents a use of multiple holographic recording medium capable of recording the characteristics of the recording medium in question and be able to achieve reproducible rainbow holographic multiple angles and get the obvious layered effect. Hierarchical multi-angle rainbow hologram reproduction step rainbow hologram is an improvement, it is repeatedly exposed to adjust the direction of the reference beam, so as to reproduce the color monochrome image by a certain sequence reproduction, strong sense of hierarchy. Since the total design-step imaging method, thus recording a hologram two-step comparison of the operation is relatively easy to obtain speckle noise is low and the diffraction efficiency of the rainbow hologram, and maximize the volume holographic recording medium recording features, achieve a recording and reproducing multiple images. A reference light during recording either a plane wave, a spherical wave is used, the optical element and thus requires relatively reduced.
Improved one step rainbow holographic recording method
True Color Hologram made by one step holography onto photoresist.
The basic characteristics of the rainbow holographic recording system in the appropriate position to join a slit, whose role is to limit the reproduction light to reduce blur color image reproduction, in order to achieve white monochrome image reproduction. Two-step rainbow holography easy to reproduce generally used in the second stage converging spherical wave is used as the reference light, the optical element relative aperture of the collimator lens, such as higher. Step rainbow holography is the nature of the observer and the object to be reconstructed image of a slit formed between watching like the image of an object seen through the slits in order to achieve white reproduction. In the one-step method 'lens with a slit-like images and record simultaneously, so you do not need first start recording a Fresnel hologram.
2D/3D Hologram Security Sticker is made by normal one step holography.
Normal step rainbow holography, the object generally in the first two times the focal length of the imaging lens, imaging lens and the object relative to the aperture limits the reflectance of the surface, often after the object light reflected -10 low, resulting rainbow hologram difficult to increase the diffraction efficiency.
Its main feature is a transparent two-dimensional image, placed before the recording medium and the recording medium.
True color hologram
Lamping: He - Ne (633nm), Ar + (514. 5nm) and Ar + (488nm) laser. Imaging an object lies near the plate is to reduce color blur, preferably with colored objects.
Imaging lens: large aperture achromatic lens, large relative aperture, focal length shorter as well.
Slit: some can be as narrow as possible, placed one focal length, the resulting image color fidelity.
Reference light: general use parallel light, the reproduction is also preferably parallel light, R light and the light angle of less than 900 O, the record for the transmission-type hologram.
True Color Hologram made by one step holography onto photoresist.
Recording media: Use Kodak 649F panchromatic holographic plate.
Reproducing, by developing, fixing process with the hologram of the reference light along the direction of the original white light, like the glasses placed at the slits can be observed really affect the color to a bright image.
True color hologram transmission type: slit eyes only see true color, you can record three kinds of light exposure is not the same, but requires close RGB laser
Holographic Film master made by one step holography lab with optics by He-cd laser.
Multiple records, level implementation
In order to obtain a hologram effect of different levels, identifies the two-dimensional image with the speckle speckle front of the screen close to the screen, along the optical axis of the imaging lens moves with the front screen and the two-dimensional image of the speckle position in the image by the lens L near the recording medium, through the appropriate exposure times can be obtained effect of the level of the background pattern.
Adjust the incident direction of the reference light, color image can be reproduced in the same direction.
If the recording medium is thicker than the recording surface of the second fringe structure, called a volume hologram, holographic recording medium with its high diffraction efficiency, wavelength and angle Bragg effect and other characteristics are widely just the holographic display in all its aspects. The quantitative relationship between the volume hologram Brooklyn parameters used to distinguish from the transmission characteristics of the volume hologram structure, when the illumination light is incident on the hologram, the peak intensity of the light scattered by the surface layer are superimposed to form the reproduction light, which is called the hologram +1 order diffracted wave, on the same side of the light scattering layer is in-phase addition satisfy the law of reflection, the light scattering between different layers grating equation is satisfied:
Hologram ID Overlay made by one step holography lab with optics by He-cd laser.
This is the volume hologram is reproduced condition, also known as the Bragg condition, when the volume hologram reproducing satisfy the Bragg condition is the maximum diffraction efficiency of the volume hologram, on the contrary, the diffraction efficiency will drop rapidly to zero.
The use of this characteristic of the volume hologram, for the realization of two-dimensional experiments identified multiple recording, typically changing the reference direction of light exposure times for each picture. Of the transmission volume hologram diffraction efficiency, in theory, the volume transmission hologram (refer to non-tilted grating Bragg incidence angle), the diffraction efficiency of a reflection hologram is true color, the reflection hologram hologram to obtain true color, the film must The anti-shrinkage treatment, resulting hologram color cast.
Hologram film, Security holographic seal made by one step holography.
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